An Astronomy Ubd for 8Th Grade Miguel Angel Webber [email protected]
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David Michael Karl the MAN BEHIND the SCIENCE
Noelo DELVE SEEK OUT VERIFY David Michael Karl THE MAN BEHIND THE SCIENCE RESEARCH AND INNOVATI ON AT THE UNIVERSITY OF HAWAI‘I - 2020 Delve. Delve. Verify. Seek. MESSAGE FROM THE VICE PRESIDENT University of Throughout history, the world has faced numerous Hawai‘i System health crises that have tested the mettle and resolve of its citizens — the Spanish flu, measles, polio, HIV/AIDS, David Lassner, PhD SARS and Ebola. Today, our world is confronted by the President COVID-19 pandemic, an unprecedented health crisis Vassilis L. Syrmos, PhD Vice President for that has rapidly spread across continents, overwhelmed Research and Innovation modern health care systems and caused widespread disruption of the global economy. NOELO, WHICH MEANS “to delVE, SEEK OUT OR verify” IN HAWAIIAN, IS Hawai‘i with its heavy dependency on tourism, is now at an economic crossroad. with high hotel THE RESEARCH MAGAZINE vacancies, idled tour operations and restricted air travel, other businesses such as restaurants and OF THE UNIVERSITY OF retail stores are also suffering from almost non-existent visitor counts. even after a vaccine for HAWai‘i SYSTEM PUBLISHED ANNUALLY BY THE OFFICE COVId-19 is developed or the effects of the disease are mitigated, the “new normal” may suggest OF THE VICE PRESIDENT FOR that changes to the travel industry and in visitor habits could result in smaller or diminishing RESEARCH AND INNOVATION. returns from the state’s primary industry. economic diversification is not only key to Hawai‘i’s economic recovery from the pandemic, PROJECT MANAGER it is also vital to its long-term economic stability and health. -
On Problems Related to Galaxy Formation
On Problems Related To Galaxy Formation Dissertation zur Erlangung des Doktorgrades (Dr. rer. nat.) der Mathematisch-Naturwissenschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität Bonn vorgelegt von Ahmed Hasan Abdullah aus Baghdad Bonn 2016 Angefertigt mit Genehmigung der Mathematisch-Naturwissenschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität Bonn 1. Gutachter: Prof. Dr. P. Kroupa 2. Gutachterin: Dr. Maria Massi Tag der Promotion: 11.04.2016 Erscheinungsjahr: 2016 To My Parents i Erklärung Hiermit versichere ich, die vorgelegte Arbeit - abgesehen von den ausdrücklich angegebenen Hilfsmit- teln -persönlich, selbstständig und ohne die Benutzung anderer als der angegebenen Hilfsmittel angefer- tigt zu haben. Die aus anderen Quellen direkt und indirekt verwendeten Daten und Konzepte sind unter der Angabe der Quelle kenntlich gemacht. Weder die vorgelegte Arbeit noch eine ähnliche Arbeit sind bereits anderweitig als Dissertation eingereicht worden und von mir wurden zuvor keine Promotionsver- suche unternommen. Für die Erstellung der vorgelegten Arbeit wurde keine fremde Hilfe, insbesondere keine entgeltliche Hilfe von Vermittlungs-, Beratungsdiensten oder Ähnlichem, in Anspruch genom- men. Bonn, den Ahmed Abdullah iii Acknowledgements I owe thanks to many people for their support and guidance which gave me a chance to complete this thesis. I am truly indebted and thankful for their support. First and foremost, I would like to express my deep and sincere gratitude to my advisor, Prof. Dr. Pavel Kroupa, for the continuous support of my study and research, and his motivation, encouragement and patient supervision. It was an honor to have a supervisor who was so patient and willing to help . I would also like to express my gratitude to Dr. -
Monthly Newsletter of the Durban Centre - March 2018
Page 1 Monthly Newsletter of the Durban Centre - March 2018 Page 2 Table of Contents Chairman’s Chatter …...…………………….……….………..….…… 3 Andrew Gray …………………………………………...………………. 5 The Hyades Star Cluster …...………………………….…….……….. 6 At the Eye Piece …………………………………………….….…….... 9 The Cover Image - Antennae Nebula …….……………………….. 11 Galaxy - Part 2 ….………………………………..………………….... 13 Self-Taught Astronomer …………………………………..………… 21 The Month Ahead …..…………………...….…….……………..…… 24 Minutes of the Previous Meeting …………………………….……. 25 Public Viewing Roster …………………………….……….…..……. 26 Pre-loved Telescope Equipment …………………………...……… 28 ASSA Symposium 2018 ………………………...……….…......…… 29 Member Submissions Disclaimer: The views expressed in ‘nDaba are solely those of the writer and are not necessarily the views of the Durban Centre, nor the Editor. All images and content is the work of the respective copyright owner Page 3 Chairman’s Chatter By Mike Hadlow Dear Members, The third month of the year is upon us and already the viewing conditions have been more favourable over the last few nights. Let’s hope it continues and we have clear skies and good viewing for the next five or six months. Our February meeting was well attended, with our main speaker being Dr Matt Hilton from the Astrophysics and Cosmology Research Unit at UKZN who gave us an excellent presentation on gravity waves. We really have to be thankful to Dr Hilton from ACRU UKZN for giving us his time to give us presentations and hope that we can maintain our relationship with ACRU and that we can draw other speakers from his colleagues and other research students! Thanks must also go to Debbie Abel and Piet Strauss for their monthly presentations on NASA and the sky for the following month, respectively. -
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. -
And Yet It Flips: Connecting Galactic Spin and the Cosmic
MNRAS 000,1–17 (2019) Preprint 5 June 2019 Compiled using MNRAS LATEX style file v3.0 And yet it flips: connecting galactic spin and the cosmic web Katarina Kraljic,1? Romeel Davé,1;2;3 and Christophe Pichon4;5 1 Institute for Astronomy, Royal Observatory, Edinburgh EH9 3HJ, United Kingdom 2 University of the Western Cape, Bellville, Cape Town 7535, South Africa 3 South African Astronomical Observatories, Observatory, Cape Town 7925, South Africa 4 Sorbonne Universités, UPMC Univ Paris 6 et CNRS, UMR 7095, Institut d’Astrophysique de Paris, 98 bis bd Arago, 75014 Paris, France 5 Korea Institute for Advanced Study (KIAS), 85 Hoegiro, Dongdaemun-gu, Seoul, 02455, Republic of Korea Accepted XXX. Received YYY; in original form ZZZ ABSTRACT We study the spin alignment of galaxies and halos with respect to filaments and walls of the cosmic web, identified with DISPERSE, using the SIMBA simulation from z = 0 − 2. Massive halos’ spins are oriented perpendicularly to their closest filament’s axis and walls, while low mass halos tend to have their spins parallel to filaments and in the plane of walls. A simi- lar mass-dependent spin flip is found for galaxies, albeit with a weaker signal particularly at low mass and low-z, suggesting that galaxies’ spins retain memory of their larger-scale en- vironment. Low-z star-forming and rotation-dominated galaxies tend to have spins parallel to nearby filaments, while quiescent and dispersion-dominated galaxies show preferentially perpendicular orientation; the star formation trend can be fully explained by the stellar mass correlation, but the morphology trend cannot. -
The Cosmic Ballet II: Spin Alignment of Galaxies and Haloes with Large-Scale filaments in the EAGLE Simulation
MNRAS 000,1–18 (2019) Preprint 19 March 2019 Compiled using MNRAS LATEX style file v3.0 The Cosmic Ballet II: Spin alignment of galaxies and haloes with large-scale filaments in the EAGLE simulation Punyakoti Ganeshaiah Veena,1;2? Marius Cautun,3 Elmo Tempel,2;4 Rien van de Weygaert1 and Carlos S. Frenk3 1Kapteyn Astronomical Institute, University of Groningen,PO Box 800, 9747 AD, Groningen, The Netherlands 2Tartu Observatory, University of Tartu, Observatooriumi 1, 61602 To~ravere, Estonia 3Department of Physics, Institute for Computational Cosmology, University of Durham, South Road, Durham, DH1 3LE, UK 4Leibniz-Institut fu¨r Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany 19 March 2019 ABSTRACT We investigate the alignment of galaxies and haloes relative to cosmic web filaments using the EAGLE hydrodynamical simulation. We identify filaments by applying the NEXUS+ method to the mass distribution and the Bisous formalism to the galaxy distribution. Both web finders return similar filamentary structures that are well aligned and that contain comparable galaxy populations. EAGLE haloes have an identical spin alignment with filaments as their counter- parts in dark matter only simulations: a complex mass dependent trend with low mass haloes spinning preferentially parallel to and high mass haloes spinning preferentially perpendicular to filaments. In contrast, galaxy spins do not show such a spin transition and have a propensity for perpendicular alignments at all masses, with the degree of alignment being largest for mas- sive galaxies. This result is valid for both NEXUS+ and Bisous filaments. When splitting by morphology, we find that elliptical galaxies show a stronger orthogonal spin–filament align- ment than spiral galaxies of similar mass. -
Observational Cosmology - 30H Course 218.163.109.230 Et Al
Observational cosmology - 30h course 218.163.109.230 et al. (2004–2014) PDF generated using the open source mwlib toolkit. See http://code.pediapress.com/ for more information. PDF generated at: Thu, 31 Oct 2013 03:42:03 UTC Contents Articles Observational cosmology 1 Observations: expansion, nucleosynthesis, CMB 5 Redshift 5 Hubble's law 19 Metric expansion of space 29 Big Bang nucleosynthesis 41 Cosmic microwave background 47 Hot big bang model 58 Friedmann equations 58 Friedmann–Lemaître–Robertson–Walker metric 62 Distance measures (cosmology) 68 Observations: up to 10 Gpc/h 71 Observable universe 71 Structure formation 82 Galaxy formation and evolution 88 Quasar 93 Active galactic nucleus 99 Galaxy filament 106 Phenomenological model: LambdaCDM + MOND 111 Lambda-CDM model 111 Inflation (cosmology) 116 Modified Newtonian dynamics 129 Towards a physical model 137 Shape of the universe 137 Inhomogeneous cosmology 143 Back-reaction 144 References Article Sources and Contributors 145 Image Sources, Licenses and Contributors 148 Article Licenses License 150 Observational cosmology 1 Observational cosmology Observational cosmology is the study of the structure, the evolution and the origin of the universe through observation, using instruments such as telescopes and cosmic ray detectors. Early observations The science of physical cosmology as it is practiced today had its subject material defined in the years following the Shapley-Curtis debate when it was determined that the universe had a larger scale than the Milky Way galaxy. This was precipitated by observations that established the size and the dynamics of the cosmos that could be explained by Einstein's General Theory of Relativity. -
Astronomy Tour of the Known Universe
Astronomy Tour of the known universe Astronomy - the study of the objects that lie beyond our planet Earth – the only planet known to host life as we know it. About Earth and the processes by which these objects interact with one 406,000 km from earth is the only earth’s natural satellite – the another. moon. Universe - the name that we use to refer to the collection of all Earth the things that exist in space. Tour of the known universe Moon Astronomers try group objects in the universe using relationships that may connect objects together such as gravitational attraction and relative velocities as a way of systematic organization and presentation. Planet Solar System The solar system – the sun, planets, dwarf planets, asteroids, Interstellar Neighborhood meteors, comets and space of about 143.73 billion km from the sun. Milky Way Galaxy Solar System Local Galactic Group Virgo Supercluster Local Supercluster - Laniakea The Observable Universe Astronomy Tour of the known universe Interstellar neighborhood – the region within about 32.6 The milky way galaxy - gravitationally bound system of about lightyears around the sun, it contains the alpha centauri which is 200 billion stars, stellar remnants, interstellar gas, dust, and dark the nearest star on earth apart from the sun as well as sirius A matter and the space of about 50, 000 lightyears from its center which is the brightest star seen on earth sky. Interstellar Neighborhood Milky Way Galaxy Astronomy Tour of the known universe The local galactic group – gravitationally bound clusters of The Virgo supercluster – gravitationally bound clusters of about galaxies of about 5 million lightyears that includes the Milky Way 47 000 galaxies and has a radius of about 55 million lightyears, it galaxy. -