DOCSLIB.ORG

August Meetings Comet NEOWISE C/2020 F3

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

July, 2020 August MeetingsJuly, 2020 The Milwaukee Astronomical Society is on the summer schedule. There will be no Membership Meetings in the summer months of June, July, and August. However, there will be a Board Meeting on August 10th, the second Monday of the month starting at 7PM. Due to the COVID-19 pandemic the meeting will be held through Zoom videocon- ference. The Board Meetings are open to the membership and everybody is welcome to attend who is interested in organizational and Observatory related issues. If you are not Inside this issue: a Board member but would like to attend please contact Tamas Kriska. The Astrophotography Focus Group will meet on Wednesday, August 12th at 7 PM August Meetings 1 trough Zoom videoconference. The specific topic of the meeting will be announced on the Google Group. Comet Neowise 1 The First Wednesday How to Meeting will also be held through Zoom videoconfer- st Minutes 2 ence on August 5 , from 7:30 PM. The MAS Google Group is as active as ever. Learn about the astronomical news, fol- Treasurer Report 2 low equipment related discussions, or just check out the latest images taken by fellow Observatory Direc- 2 Club members. tor Report Membership 2 Comet NEOWISE C/2020 F3 Comet NEOWISE 3 In the News 5 This month we had an Adopt a Scope 6 unexpected celestial visi- tor, the brightest comet Officers/Staff 6 in the northern hemi- Keyholders 6 sphere since Comet Hale –Bopp in 1997. The C/2020 F3, a long period comet with a near- parabolic orbit was dis- covered on March 27 during the NEOWISE mission of the Wide-field Infrared Survey Explorer (WISE) space telescope. On July 3, the comet emerged from perihelion around magnitude 1, making it bright enough By Tomruen - computed with my own software, FullSky Ob- to be visible to the naked servatory, using trajectories from JPL Horizons. eye. NASA's Parker Solar Probe had captured an image of the comet, from which the diameter of the nucleus was estimated at approximately 5 km (3 mi). This passage increased the comet's orbital pe- riod from about 4400 years to about 6700 years. It was widely photographed by amateur observers including many MAS members. Despite the difficulties of processing the data many beautiful widefield and close up photos were shared on the Google Group. A collection of them can be found on page 3 and 4 of this issue. It was a real treat to see and photograph this comet. Page 2 Observatory Director Report Minutes The new steps are in for the entrance into A- Due to the COVID-19 outbreak the Board Building and they look great. Sod has been plant- meeting was held on July 13st via Zoom videocon- ed around the steps and thanks goes out to Lee ference and was called to order at 7:02PM by Ta- Keith for keeping up on the watering. mas Kriska President. The following Board Mem- Pieces of equipment from the large donation bers were present: Jim Bakic, Mike Bauer, Paul made several months ago are being tested, Borchardt, Clark Brizendine, Jason Doyle, Lee cleaned up, and made ready for sale. Members Keith, Jeff Kraehnke, Dennis Roscoe, Gabe will have the first chance to purchase items be- Shaughnessy, Jim Schroeter, Sue Timlin, Mike fore they are listed on the internet. Wagner, and Agnes Keszler. Gene Hanson I’d like to thank the keyholders for their extra (Founding Memeber), Randy Culp, and Russ help in getting the Observatory open for the members. Keep up the good work and stay safe Blankenburg were also present. doing it. Minutes, and Treasurer's Report electronically Respectfully Submitted, submitted ahead of the meeting were approved. Paul Borchardt, Observatory Director Observatory Director's Report electronically submitted ahead of the meeting was amended and approved. Amendment: The water pressure Treasurer’s Report tank has broken due to the winter frost. It has been repaired in May. For the future heating tape $10,327.50 Starting Balance as of 06/06/2020 should be installed. Expenditures Membership Committee Report was electroni- cally ahead of the meeting. Membership applica- $2.31 PayPal fees tions of Mitzi Keadle, Elizabeth Haase, and Guine- $820.00 Insurance premium vere Hicks were approved. $541.95 Quonset new stairs Old Business – Public Nights: Due to the COVID- $73.75 Other expenses 19 situation all Public Nights are cancelled for this $55.88 WE Energies year. Concrete step installation: Paul Borchardt will fol- $36.00 Water/Sewer low up for the back-door concrete slab pouring. $1,529.89 TOTAL Expenditures Will ask for price. He is also working on the PVC Revenue box around the hydrant. $70.25 Private donations Front garage reroofing: Jeff Kraehnke received a $146.00 Membership dues quote of $2490. A motion was made and carried to $57.00 Astronomical League accept the quote and allocate $3000 for the re- $4.00 Grants roofing project. Trees should be trimmed or re- $277.25 TOTAL Revenue moved prior the work. Entrance gate: Jeff suggested to install a pair of $9,074.25 Ending Balance as of 07/11/2020 drive way gate (DoMyOwn $128/piece). A motion Respectfully Submitted, was made and carried to allocate $500 for this Sue Timlin, Treasurer project. New Business – No new business. Membership Report Announcement – The next meeting will be on Monday, August 10th, 2020 via Zoom videoconfer- Since the last Report we received 5 new ap- ence. plications. We welcome Elizabeth Haase, Ian Respectfully Submitted, Thomson & Mike Leach, Francisco Lopez Ortiz, Agnes Keszler, Secretary Dawne Zaffke & Family, and Dawn McElrone & Family. The total number of active members is 176. Respectfully Submitted, Jeff Kraehnke, Committee Chair Page 3 Comet NEOWISE Dennis Horvath Tamas Kriska Arun Hegde John Asztalos Chad Andrist Nolan Zadra Jeff Kraehnke Jim Bakic Page 4 Comet NEOWISE Arun Hegde Dennis Horvath Gabe Shaughnessy Joe Wilcox John Asztalos Girish Muralidharan Chad Andrist Jeff Kraehnke Page 5 In the Astronomical News Astronomers Discover South Pole Wall, a Gigantic Structure Stretching 1.4 Billion Light-years Across Spectacular 3D maps of the universe have re- peculiar velocity of galaxies. This measurement vealed one of the biggest cosmic structures ever includes redshift but also takes into account the found — an almost-inconceivable wall stretching motion of galaxies around one another as they 1.4 billion light-years across that contains hun- tug at each other gravitationally, Pomarede dreds of thousands of galaxies. The South Pole said. The advantage of the method is that it can Wall, as it's been dubbed, has been hiding in detect hidden mass that is gravitationally influ- plain sight, remaining undetected until now be- encing how galaxies move and therefore uncover cause large parts of it sit half a billion light-years dark matter, that invisible stuff that emits no light away behind the bright Milky Way galaxy. The but exerts a gravitational tug on anything near South Pole Wall rivals in size the Sloan Great Wall, enough. By running algorithms looking at peculi- the sixth largest cosmic structure discovered. ar motion in galactic catalogs, the team was able Astronomers have long noticed that galaxies to plot the three-dimensional distribution of mat- are not scattered randomly throughout the uni- ter in and around the Zone of Galactic Obscura- verse but rather clump together in what's known tion. as the cosmic The result- web, enormous ing map shows strands of hy- a mind- drogen gas in boggling bub- which galaxies ble of material are strung like more or less pearls on a centered on necklace that the southern- surround gi- most point of gantic and the sky, with a largely empty great sweeping voids. Mapping wing extending these interga- north on one lactic threads side in the di- belongs to the rection of the field of cos- constellation mography, An all-sky map zoomed in on the South Pole, showing dust only. In this view, Cetus and an- the South Pole Wall is not visible, though it is near the Chamaeleon complex. which is "the other stubbier The bright line ringing shows the Zone of Galactic Obscuration. Credit: D. cartography of arm opposite it Pomarede, R. B. Tully, R. Graziani, H. Courtois, Y. Hoffman, J. Lezmy. the cosmos," in the direction study researcher of the constel- Daniel Pomarede, a cosmographer at Paris-Saclay lation Apus. Knowing how the universe looks on University in France, told Live Science. In 2014, such large scales helps confirm our current cos- Pomarede and his colleagues unveiled the mological models, Neta Bahcall, an astrophysicist Laniakea supercluster, a galactic collection in at Princeton University in New Jersey who was which our own Milky Way resides. Lanaikea is 520 not involved in the work, told Live Science. But million light-years wide and contains roughly the determining where exactly these enormous, mass of 100 million billion suns. For their new crisscrossing structures begin and end is tricky, map, the team used newly-created sky surveys to she added. "When you look at the network of fila- peer into a region called the Zone of Galactic Ob- ments and voids, it becomes a semantic question scuration. This is an area in the southern part of of what's connected," she said. the sky in which the bright light of the Milky Way The team acknowledges that they may not blocks out much of what's behind and around it. have plotted yet the entirety of the vast South Cosmographers typically determine the dis- Pole Wall. "We will not be certain of its full ex- tance to objects using redshift, the speed at which tent, nor whether it is unusual, until we map the an object is receding from Earth due to the expan- universe on a significantly grander scale," they sion of the universe, which depends on their dis- wrote.
Recommended publications
  • Proper Motions of Young Stars in Chamaeleon II

    Proper Motions of Young Stars in Chamaeleon II

    A&A 556, A144 (2013) Astronomy DOI: 10.1051/0004-6361/201321217 & c ESO 2013 Astrophysics Proper motions of young stars in Chamaeleon II. New kinematical candidate members of Chamaeleon I and II Belén López Martí1, Francisco Jiménez-Esteban1,2,3, Amelia Bayo4,5, David Barrado1,6, Enrique Solano1,2, Hervé Bouy1, and Carlos Rodrigo1,2 1 Centro de Astrobiología (INTA-CSIC), Departamento de Astrofísica, PO Box 78, 28261 Villanueva de la Cañada, Madrid, Spain e-mail: [email protected] 2 Spanish Virtual Observatory, 2869 Madrid, Spain 3 Suffolk University, Madrid Campus, C/ Valle de la Viña 3, 28003 Madrid, Spain 4 European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile 5 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany 6 Calar Alto Observatory, Centro Astronómico Hispano-Alemán, C/ Jesús Durbán Remón 2-2, 04004 Almería, Spain Received 1 February 2013 / Accepted 1 July 2013 ABSTRACT Context. The Chamaeleon star-forming region has been extensively studied in the last decades. However, most studies have been confined to the densest parts of the clouds. In a previous paper, we analysed the kinematical properties of the spectroscopically confirmed population of the Chamaeleon I and II clouds. Aims. We want to search for new kinematical candidate members to the Chamaeleon I and II moving groups, extending the studied area beyond the clouds, and to characterize these new populations using available information from public databases and catalogues. We also want to check if the populations of the moving groups are confined to the present dark clouds. Methods. Kinematic candidate members were initially selected on the basis of proper motions and colours using the Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4).
  • Einstein's Geometrical Versus Feynman's Quantum-Field

    Einstein's Geometrical Versus Feynman's Quantum-Field

    Universe 2020, 6(11), 212; doi:10.3390/universe6110212 Einstein’s Geometrical Versus Feynman’s Quantum-Field Approaches to Gravity Physics: Testing by Modern Multimessenger Astronomy Yurij Baryshev 1, ∗ 1Astronomy Department, Mathematics & Mechanics Faculty, Saint Petersburg State University, 28 Universitetskiy Prospekt, 198504 St. Petersburg, Russia Modern multimessenger astronomy delivers unique opportunity for performing crucial ob- servations that allow for testing the physics of the gravitational interaction. These tests include detection of gravitational waves by advanced LIGO-Virgo antennas, Event Horizon Telescope observations of central relativistic compact objects (RCO) in active galactic nuclei (AGN), X-ray spectroscopic observations of Fe Kα line in AGN, Galactic X-ray sources mea- surement of masses and radiuses of neutron stars, quark stars, and other RCO. A very impor- tant task of observational cosmology is to perform large surveys of galactic distances indepen- dent on cosmological redshifts for testing the nature of the Hubble law and peculiar velocities. Forthcoming multimessenger astronomy, while using such facilities as advanced LIGO-Virgo, Event Horizon Telescope (EHT), ALMA, WALLABY, JWST, EUCLID, and THESEUS, can elucidate the relation between Einstein’s geometrical and Feynman’s quantum-field ap- proaches to gravity physics and deliver a new possibilities for unification of gravitation with other fundamental quantum physical interactions. Keywords: gravitation; cosmology; multimessenger astronomy; quantum physics. arXiv:1702.02020v3 [physics.gen-ph] 4 Dec 2020 ∗ Electronic address: [email protected]; [email protected] 2 Contents 1. Introduction 5 1.1. Key Discoveries of Modern Multimessenger Astronomy 6 1. Gravitational Waves 6 2. Imaging of Black Holes Candidates: Relativistic Jets and Disks 7 3.
  • Arxiv:0808.3207V1 [Astro-Ph] 23 Aug 2008 Nfgr .Nwonsaswr Rtdrcl Icvrdi C in Discovered Directly H first Were and Surroun Stars Variability Area Newborn the of 4

    Arxiv:0808.3207V1 [Astro-Ph] 23 Aug 2008 Nfgr .Nwonsaswr Rtdrcl Icvrdi C in Discovered Directly H first Were and Surroun Stars Variability Area Newborn the of 4

    Handbook of Star Forming Regions Vol. II Astronomical Society of the Pacific, 2008 Bo Reipurth, ed. Chamaeleon Kevin L. Luhman Department of Astronomy and Astrophysics The Pennsylvania State University University Park, PA 16802, USA Abstract. The dark clouds in the constellation of Chamaeleon have distances of 160-180pc from the Sun and a total mass of ∼5000 M⊙. The three main clouds, Cha I, II, and III, have angular sizes of a few square degrees and maximum extinctions of AV ∼ 5-10. Most of the star formation in these clouds is occurring in Cha I, with the remainder in Cha II. The current census of Cha I contains 237 known members, 33 of which have spectral types indicative of brown dwarfs (>M6). Approximately 50 members of Cha II have been identified, including a few brown dwarfs. When interpreted with the evolutionary models of Chabrier and Baraffe, the H-R diagram for Cha I exhibits a median age of ∼2 Myr, making it coeval with IC 348 and slightly older than Taurus (∼1 Myr). TheIMF ofChaI reachesa maximumat a massof0.1-0.15 M⊙, and thus closely resembles the IMFs in IC 348 and the Orion Nebula Cluster. The disk fraction in Cha I is roughly constant at ∼ 50% from 0.01 to 0.3 M⊙ and increases to ∼ 65% at higher masses. In comparison, IC 348 has a similar disk fraction at low masses but a much lower disk fraction at M ∼> 1 M⊙, indicating that solar-type stars have longer disk lifetimes in Cha I. 1. Introduction The southern constellation of Chamaeleon contains one of the nearest groups of dark clouds to the Sun (d ∼ 160-180 pc).
  • Astronomers Map Massive Structure Beyond Laniakea Supercluster 13 July 2020

    Astronomers Map Massive Structure Beyond Laniakea Supercluster 13 July 2020

    Astronomers map massive structure beyond Laniakea Supercluster 13 July 2020 the Milky Way. Along the arm, galaxies are slowly moving toward the South Pole, and from there, across a part of the sky obscured from Earth by the Milky Way toward the dominant structure in the nearby universe, the Shapley connection. "We wonder if the South Pole Wall is much bigger than what we see. What we have mapped stretches across the full domain of the region we have surveyed. We are early explorers of the cosmos, extending our maps into unknown territory," described Tully. The team's research was published in Astrophysical Journal. Throughout the last 40 years, there has been a growing appreciation of patterns in the distribution of galaxies in the Universe, reminiscent of geographic features like mountain ranges and island archipelagos. The Milky Way galaxy, with its South Pole Wall. Credit: University of Hawaii at Manoa 100 billion stars, is part of the small Local Group of galaxies, which in turn is a suburb of the Virgo cluster with thousands of galaxies. The Virgo cluster in turn is an outer component of an even For the past decade, an international team of larger conglomeration of many rich clusters of astronomers, led in part by Brent Tully at the galaxies, collectively called the "Great Attractor" University of Hawai?i Institute for Astronomy, has because of its immense gravitational pull. In 2014, been mapping the distribution of galaxies around the team mapped out the Laniakea Supercluster, the Milky Way. They have discovered an immense the bundling of a hundred thousand galaxies over structure beyond Laniakea, an immense an even larger region, spanning 500 million light supercluster of galaxies, including our own.
  • Andersson & Potter 2007

    Andersson & Potter 2007

    The Astrophysical Journal, 665:369Y389, 2007 August 10 A # 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A. OBSERVATIONAL CONSTRAINTS ON INTERSTELLAR GRAIN ALIGNMENT B-G Andersson Center for Astrophysical Sciences, Johns Hopkins University, Baltimore, MD 21218; [email protected] and S. B. Potter South African Astronomical Observatory, Observatory 7935, Cape Town, South Africa; [email protected] Received 2006 September 21; accepted 2007 May 8 ABSTRACT We present new multicolor photopolarimetry of stars behind the Southern Coalsack. Analyzed together with multiband polarization data from the literature, probing the Chamaeleon I, Musca, Opiuchus, R CrA, and Taurus clouds, we show that the wavelength of maximum polarization (k max) is linearly correlated with the radiation en- vironment of the grains. Using far-infrared emission data, we show that the large scatter seen in previous studies of k max as a function of AV is primarily due to line-of-sight effects causing some AV measurements to not be a good tracer of the extinction (radiation field strength) seen by the grains being probed. The derived slopes in k max versus AV, for the individual clouds, are consistent with a common value, while the zero intercepts scale with the average values of the ratios of total to selective extinction (RV) for the individual clouds. Within each cloud we do not find direct correlations between k max and RV . The positive slope is consistent with recent developments in theory and indicating alignment driven by the radiation field. The present data cannot conclusively differentiate between direct radiative torques and alignment driven by H2 formation.
  • FY13 High-Level Deliverables

    FY13 High-Level Deliverables

    National Optical Astronomy Observatory Fiscal Year Annual Report for FY 2013 (1 October 2012 – 30 September 2013) Submitted to the National Science Foundation Pursuant to Cooperative Support Agreement No. AST-0950945 13 December 2013 Revised 18 September 2014 Contents NOAO MISSION PROFILE .................................................................................................... 1 1 EXECUTIVE SUMMARY ................................................................................................ 2 2 NOAO ACCOMPLISHMENTS ....................................................................................... 4 2.1 Achievements ..................................................................................................... 4 2.2 Status of Vision and Goals ................................................................................. 5 2.2.1 Status of FY13 High-Level Deliverables ............................................ 5 2.2.2 FY13 Planned vs. Actual Spending and Revenues .............................. 8 2.3 Challenges and Their Impacts ............................................................................ 9 3 SCIENTIFIC ACTIVITIES AND FINDINGS .............................................................. 11 3.1 Cerro Tololo Inter-American Observatory ....................................................... 11 3.2 Kitt Peak National Observatory ....................................................................... 14 3.3 Gemini Observatory ........................................................................................
  • Orders of Magnitude (Length) - Wikipedia

    Orders of Magnitude (Length) - Wikipedia

    03/08/2018 Orders of magnitude (length) - Wikipedia Orders of magnitude (length) The following are examples of orders of magnitude for different lengths. Contents Overview Detailed list Subatomic Atomic to cellular Cellular to human scale Human to astronomical scale Astronomical less than 10 yoctometres 10 yoctometres 100 yoctometres 1 zeptometre 10 zeptometres 100 zeptometres 1 attometre 10 attometres 100 attometres 1 femtometre 10 femtometres 100 femtometres 1 picometre 10 picometres 100 picometres 1 nanometre 10 nanometres 100 nanometres 1 micrometre 10 micrometres 100 micrometres 1 millimetre 1 centimetre 1 decimetre Conversions Wavelengths Human-defined scales and structures Nature Astronomical 1 metre Conversions https://en.wikipedia.org/wiki/Orders_of_magnitude_(length) 1/44 03/08/2018 Orders of magnitude (length) - Wikipedia Human-defined scales and structures Sports Nature Astronomical 1 decametre Conversions Human-defined scales and structures Sports Nature Astronomical 1 hectometre Conversions Human-defined scales and structures Sports Nature Astronomical 1 kilometre Conversions Human-defined scales and structures Geographical Astronomical 10 kilometres Conversions Sports Human-defined scales and structures Geographical Astronomical 100 kilometres Conversions Human-defined scales and structures Geographical Astronomical 1 megametre Conversions Human-defined scales and structures Sports Geographical Astronomical 10 megametres Conversions Human-defined scales and structures Geographical Astronomical 100 megametres 1 gigametre
  • Arxiv:2105.09338V2 [Astro-Ph.GA] 16 Jun 2021

    Arxiv:2105.09338V2 [Astro-Ph.GA] 16 Jun 2021

    Draft version June 18, 2021 Typeset using LATEX twocolumn style in AASTeX63 Stars with Photometrically Young Gaia Luminosities Around the Solar System (SPYGLASS) I: Mapping Young Stellar Structures and their Star Formation Histories Ronan Kerr,1 Aaron C. Rizzuto,1, ∗ Adam L. Kraus,1 and Stella S. R. Offner1 1Department of Astronomy, University of Texas at Austin 2515 Speedway, Stop C1400 Austin, Texas, USA 78712-1205 (Accepted May 16, 2021) ABSTRACT Young stellar associations hold a star formation record that can persist for millions of years, revealing the progression of star formation long after the dispersal of the natal cloud. To identify nearby young stellar populations that trace this progression, we have designed a comprehensive framework for the identification of young stars, and use it to identify ∼3×104 candidate young stars within a distance of 333 pc using Gaia DR2. Applying the HDBSCAN clustering algorithm to this sample, we identify 27 top-level groups, nearly half of which have little to no presence in previous literature. Ten of these groups have visible substructure, including notable young associations such as Orion, Perseus, Taurus, and Sco-Cen. We provide a complete subclustering analysis on all groups with substructure, using age estimates to reveal each region's star formation history. The patterns we reveal include an apparent star formation origin for Sco-Cen along a semicircular arc, as well as clear evidence for sequential star formation moving away from that arc with a propagation speed of ∼4 km s−1 (∼4 pc Myr−1). We also identify earlier bursts of star formation in Perseus and Taurus that predate current, kinematically identical active star-forming events, suggesting that the mechanisms that collect gas can spark multiple generations of star formation, punctuated by gas dispersal and cloud regrowth.
  • Annual Report ESO Staff Papers 2018

    Annual Report ESO Staff Papers 2018

    ESO Staff Publications (2018) Peer-reviewed publications by ESO scientists The ESO Library maintains the ESO Telescope Bibliography (telbib) and is responsible for providing paper-based statistics. Publications in refereed journals based on ESO data (2018) can be retrieved through telbib: ESO data papers 2018. Access to the database for the years 1996 to present as well as an overview of publication statistics are available via http://telbib.eso.org and from the "Basic ESO Publication Statistics" document. Papers that use data from non-ESO telescopes or observations obtained with hosted telescopes are not included. The list below includes papers that are (co-)authored by ESO authors, with or without use of ESO data. It is ordered alphabetically by first ESO-affiliated author. Gravity Collaboration, Abuter, R., Amorim, A., Bauböck, M., Shajib, A.J., Treu, T. & Agnello, A., 2018, Improving time- Berger, J.P., Bonnet, H., Brandner, W., Clénet, Y., delay cosmography with spatially resolved kinematics, Coudé Du Foresto, V., de Zeeuw, P.T., et al. , 2018, MNRAS, 473, 210 [ADS] Detection of orbital motions near the last stable circular Treu, T., Agnello, A., Baumer, M.A., Birrer, S., Buckley-Geer, orbit of the massive black hole SgrA*, A&A, 618, L10 E.J., Courbin, F., Kim, Y.J., Lin, H., Marshall, P.J., Nord, [ADS] B., et al. , 2018, The STRong lensing Insights into the Gravity Collaboration, Abuter, R., Amorim, A., Anugu, N., Dark Energy Survey (STRIDES) 2016 follow-up Bauböck, M., Benisty, M., Berger, J.P., Blind, N., campaign - I. Overview and classification of candidates Bonnet, H., Brandner, W., et al.
  • Arxiv:2007.04414V1 [Astro-Ph.CO] 8 Jul 2020 Bution of Matter on Large Scales Is Inferred from Tion)

    Arxiv:2007.04414V1 [Astro-Ph.CO] 8 Jul 2020 Bution of Matter on Large Scales Is Inferred from Tion)

    Key words: large scale structure of universe | galaxies: distances and redshifts Draft version July 10, 2020 Typeset using LATEX preprint2 style in AASTeX62 Cosmicflows-3: The South Pole Wall Daniel Pomarede,` 1 R. Brent Tully,2 Romain Graziani,3 Hel´ ene` M. Courtois,4 Yehuda Hoffman,5 and Jer´ emy´ Lezmy4 1Institut de Recherche sur les Lois Fondamentales de l'Univers, CEA Universit´eParis-Saclay, 91191 Gif-sur-Yvette, France 2Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA 3Laboratoire de Physique de Clermont, Universit Clermont Auvergne, Aubire, France 4University of Lyon, UCB Lyon 1, CNRS/IN2P3, IUF, IP2I Lyon, France 5Racah Institute of Physics, Hebrew University, Jerusalem, 91904 Israel ABSTRACT Velocity and density field reconstructions of the volume of the universe within 0:05c derived from the Cosmicflows-3 catalog of galaxy distances has revealed the presence of a filamentary structure extending across ∼ 0:11c. The structure, at a characteristic redshift of 12,000 km s−1, has a density peak coincident with the celestial South Pole. This structure, the largest contiguous feature in the local volume and comparable to the Sloan Great Wall at half the distance, is given the name the South Pole Wall. 1. INTRODUCTION ble of measurements: to a first approximation The South Pole Wall rivals the Sloan Great Vpec = Vobs − H0d. Although uncertainties with Wall in extent, at a distance a factor two individual galaxies are large, the analysis bene- closer. The iconic structures that have trans- fits from the long range correlated nature of the formed our understanding of large scale struc- cosmic flow, allowing the reconstruction of the ture have come from the observed distribution 3D velocity field from noisy, finite and incom- of galaxies assembled from redshift surveys: the plete data (Zaroubi et al.
  • Map of the Huge-LQG Noted by Black Circles, Adjacent to the Clowes�Campusan O LQG in Red Crosses

    Map of the Huge-LQG Noted by Black Circles, Adjacent to the ClowesCampusan O LQG in Red Crosses

    Huge-LQG From Wikipedia, the free encyclopedia Map of Huge-LQG Quasar 3C 273 Above: Map of the Huge-LQG noted by black circles, adjacent to the ClowesCampusan o LQG in red crosses. Map is by Roger Clowes of University of Central Lancashire . Bottom: Image of the bright quasar 3C 273. Each black circle and red cross on the map is a quasar similar to this one. The Huge Large Quasar Group, (Huge-LQG, also called U1.27) is a possible structu re or pseudo-structure of 73 quasars, referred to as a large quasar group, that measures about 4 billion light-years across. At its discovery, it was identified as the largest and the most massive known structure in the observable universe, [1][2][3] though it has been superseded by the Hercules-Corona Borealis Great Wa ll at 10 billion light-years. There are also issues about its structure (see Dis pute section below). Contents 1 Discovery 2 Characteristics 3 Cosmological principle 4 Dispute 5 See also 6 References 7 Further reading 8 External links Discovery[edit] Roger G. Clowes, together with colleagues from the University of Central Lancash ire in Preston, United Kingdom, has reported on January 11, 2013 a grouping of q uasars within the vicinity of the constellation Leo. They used data from the DR7 QSO catalogue of the comprehensive Sloan Digital Sky Survey, a major multi-imagi ng and spectroscopic redshift survey of the sky. They reported that the grouping was, as they announced, the largest known structure in the observable universe. The structure was initially discovered in November 2012 and took two months of verification before its announcement.
  • PT-365-Updated-Classroom-Material-March-May-20.Pdf

    PT-365-Updated-Classroom-Material-March-May-20.Pdf

    Dear Students, Hope your preparation is going well. We wish to communicate our plan, at part of PT 365, for the upcoming prelims examination. Given that Prelims examination is now scheduled for 4th October, we will be covering current affairs till the month of August in the following manner - • PT 365 Updation - o Coverage - Current affairs for the months of March, April and May • PT 365 Extended - o Tentative date of release - 10th September o Coverage - Current affairs for the months of June, July and August Hope these documents help you in boosting your preparation and building up your confidence further as you wind up your preparations. Best Wishes Team Vision IAS Table of Contents 1. POLITY AND CONSTITUTION __________ 4 2.2.2. Organisation for the Prohibition of Chemical 1.1. Issues Related to Constitution ________ 4 Weapons _____________________________ 15 1.1.1. Right to Property____________________ 4 2.2.3. Multilateral Development Banks ______ 15 1.1.2. Reservation in Scheduled Areas ________ 4 2.2.4. WHO ____________________________ 16 1.1.3. Jammu & Kashmir Domicile Rules_______ 5 2.2.4.1. World Health Assembly (WHA) ____ 16 1.1.4. Constitutional Articles in News _________ 5 2.2.4.2. WHO executive board ___________ 16 1.2. Issues Related to Functioning of 2.2.4.3. World Health Organization Funding 16 Parliament/ State Legislature/Local 2.3. International Events _______________ 17 2.3.1. UN75 ___________________________ 17 Government __________________________ 6 2.3.2. Open Skies Treaty __________________ 17 1.2.1. Rajya Sabha Elections ________________ 6 2.3.3.