Towards Multi-Wavelength Observations of Relativistic Jets from General Relativistic Magnetohydrodynamic Simulations a Dissertat
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Arxiv:1705.04776V1 [Astro-Ph.HE] 13 May 2017 Aaua M
White Paper on East Asian Vision for mm/submm VLBI: Toward Black Hole Astrophysics down to Angular Resolution of 1 RS Editors Asada, K.1, Kino, M.2,3, Honma, M.3, Hirota, T.3, Lu, R.-S.4,5, Inoue, M.1, Sohn, B.-W.2,6, Shen, Z.-Q.4, and Ho, P. T. P.1,7 Authors Akiyama, K.3,8, Algaba, J-C.2, An, T.4, Bower, G.1, Byun, D-Y.2, Dodson, R.9, Doi, A.10, Edwards, P.G.11, Fujisawa, K.12, Gu, M-F.4, Hada, K.3, Hagiwara, Y.13, Jaroenjittichai, P.15, Jung, T.2,6, Kawashima, T.3, Koyama, S.1,5, Lee, S-S.2, Matsushita, S.1, Nagai, H.3, Nakamura, M.1, Niinuma, K.12, Phillips, C.11, Park, J-H.15, Pu, H-Y.1, Ro, H-W.2,6, Stevens, J.11, Trippe, S.15, Wajima, K.2, Zhao, G-Y.2 1 Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan 2 Korea Astronomy and Space Science Institute, Daedukudae-ro 776, Yuseong-gu, Daejeon 34055, Republic of Korea 3 National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan 4 Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China 5 Max-Planck-Institut f¨ur Radioastronomie, Auf dem H¨ugel 69, D-53121 Bonn, Germany 6 University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 7 East Asian Observatory, 660 N. -
The Third Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope M
The Astrophysical Journal, 810:14 (34pp), 2015 September 1 doi:10.1088/0004-637X/810/1/14 © 2015. The American Astronomical Society. All rights reserved. THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE M. Ackermann1, M. Ajello2, W. B. Atwood3, L. Baldini4, J. Ballet5, G. Barbiellini6,7, D. Bastieri8,9, J. Becerra Gonzalez10,11, R. Bellazzini12, E. Bissaldi13, R. D. Blandford14, E. D. Bloom14, R. Bonino15,16, E. Bottacini14, T. J. Brandt10, J. Bregeon17, R. J. Britto18, P. Bruel19, R. Buehler1, S. Buson8,9, G. A. Caliandro14,20, R. A. Cameron14, M. Caragiulo13, P. A. Caraveo21, B. Carpenter10,22, J. M. Casandjian5, E. Cavazzuti23, C. Cecchi24,25, E. Charles14, A. Chekhtman26, C. C. Cheung27, J. Chiang14, G. Chiaro9, S. Ciprini23,24,28, R. Claus14, J. Cohen-Tanugi17, L. R. Cominsky29, J. Conrad30,31,32,70, S. Cutini23,24,28,R.D’Abrusco33,F.D’Ammando34,35, A. de Angelis36, R. Desiante6,37, S. W. Digel14, L. Di Venere38, P. S. Drell14, C. Favuzzi13,38, S. J. Fegan19, E. C. Ferrara10, J. Finke27, W. B. Focke14, A. Franckowiak14, L. Fuhrmann39, Y. Fukazawa40, A. K. Furniss14, P. Fusco13,38, F. Gargano13, D. Gasparrini23,24,28, N. Giglietto13,38, P. Giommi23, F. Giordano13,38, M. Giroletti34, T. Glanzman14, G. Godfrey14, I. A. Grenier5, J. E. Grove27, S. Guiriec10,2,71, J. W. Hewitt41,42, A. B. Hill14,43,68, D. Horan19, R. Itoh40, G. Jóhannesson44, A. S. Johnson14, W. N. Johnson27, J. Kataoka45,T.Kawano40, F. Krauss46, M. Kuss12, G. La Mura9,47, S. Larsson30,31,48, L. -
Counting Gamma Rays in the Directions of Galaxy Clusters
A&A 567, A93 (2014) Astronomy DOI: 10.1051/0004-6361/201322454 & c ESO 2014 Astrophysics Counting gamma rays in the directions of galaxy clusters D. A. Prokhorov1 and E. M. Churazov1,2 1 Max Planck Institute for Astrophysics, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany e-mail: [email protected] 2 Space Research Institute (IKI), Profsouznaya 84/32, 117997 Moscow, Russia Received 6 August 2013 / Accepted 19 May 2014 ABSTRACT Emission from active galactic nuclei (AGNs) and from neutral pion decay are the two most natural mechanisms that could establish a galaxy cluster as a source of gamma rays in the GeV regime. We revisit this problem by using 52.5 months of Fermi-LAT data above 10 GeV and stacking 55 clusters from the HIFLUCGS sample of the X-ray brightest clusters. The choice of >10 GeV photons is optimal from the point of view of angular resolution, while the sample selection optimizes the chances of detecting signatures of neutral pion decay, arising from hadronic interactions of relativistic protons with an intracluster medium, which scale with the X-ray flux. In the stacked data we detected a signal for the central 0.25 deg circle at the level of 4.3σ. Evidence for a spatial extent of the signal is marginal. A subsample of cool-core clusters has a higher count rate of 1.9 ± 0.3 per cluster compared to the subsample of non-cool core clusters at 1.3 ± 0.2. Several independent arguments suggest that the contribution of AGNs to the observed signal is substantial, if not dominant. -
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 ........................................................................................ -
IAU Symp 269, POST MEETING REPORTS
IAU Symp 269, POST MEETING REPORTS C.Barbieri, University of Padua, Italy Content (i) a copy of the final scientific program, listing invited review speakers and session chairs; (ii) a list of participants, including their distribution on gender (iii) a list of recipients of IAU grants, stating amount, country, and gender; (iv) receipts signed by the recipients of IAU Grants (done); (v) a report to the IAU EC summarizing the scientific highlights of the meeting (1-2 pages). (vi) a form for "Women in Astronomy" statistics. (i) Final program Conference: Galileo's Medicean Moons: their Impact on 400 years of Discovery (IAU Symposium 269) Padova, Jan 6-9, 201 Program Wednesday 6, location: Centro San Gaetano, via Altinate 16.0 0 – 18.00 meeting of Scientific Committee (last details on the Symp 269; information on the IYA closing ceremony program) 18.00 – 20.00 welcome reception Thursday 7, morning: Aula Magna University 8:30 – late registrations 09.00 – 09.30 Welcome Addresses (Rector of University, President of COSPAR, Representative of ESA, President of IAU, Mayor of Padova, Barbieri) Session 1, The discovery of the Medicean Moons, the history, the influence on human sciences Chair: R. Williams Speaker Title 09.30 – 09.55 (1) G. Coyne Galileo's telescopic observations: the marvel and meaning of discovery 09.55 – 10.20 (2) D. Sobel Popular Perceptions of Galileo 10.20 – 10.45 (3) T. Owen The slow growth of human humility (read by Scott Bolton) 10.45 – 11.10 (4) G. Peruzzi A new Physics to support the Copernican system. Gleanings from Galileo's works 11.10 – 11.35 Coffee break Session 1b Chair: T. -
GLAST Science Glossary (PDF)
GLAST SCIENCE GLOSSARY Source: http://glast.sonoma.edu/science/gru/glossary.html Accretion — The process whereby a compact object such as a black hole or neutron star captures matter from a normal star or diffuse cloud. Active galactic nuclei (AGN) — The central region of some galaxies that appears as an extremely luminous point-like source of radiation. They are powered by supermassive black holes accreting nearby matter. Annihilation — The process whereby a particle and its antimatter counterpart interact, converting their mass into energy according to Einstein’s famous formula E = mc2. For example, the annihilation of an electron and positron results in the emission of two gamma-ray photons, each with an energy of 511 keV. Anticoincidence Detector — A system on a gamma-ray observatory that triggers when it detects an incoming charged particle (cosmic ray) so that the telescope will not mistake it for a gamma ray. Antimatter — A form of matter identical to atomic matter, but with the opposite electric charge. Arcminute — One-sixtieth of a degree on the sky. Like latitude and longitude on Earth's surface, we measure positions on the sky in angles. A semicircle that extends up across the sky from the eastern horizon to the western horizon is 180 degrees. One degree, therefore, is not a very big angle. An arcminute is an even smaller angle, 1/60 as large as a degree. The Moon and Sun are each about half a degree across, or about 30 arcminutes. If you take a sharp pencil and hold it at arm's length, then the point of that pencil as seen from your eye is about 3 arcminutes across. -
Liverpool Telescope 2: a New Robotic Facility for Rapid Transient Follow-Up
Noname manuscript No. (will be inserted by the editor) Liverpool Telescope 2: a new robotic facility for rapid transient follow-up C.M. Copperwheat · I.A. Steele · R.M. Barnsley · S.D. Bates · D. Bersier · M.F. Bode · D. Carter · N.R. Clay · C.A. Collins · M.J. Darnley · C.J. Davis · C.M. Gutierrez · D.J. Harman · P.A. James · J.H. Knapen · S. Kobayashi · J.M. Marchant · P.A. Mazzali · C.J. Mottram · C.G. Mundell · A. Newsam · A. Oscoz · E. Palle · A. Piascik · R. Rebolo · R.J. Smith Received: date / Accepted: date Abstract The Liverpool Telescope is one of the world’s premier facilities for time domain astronomy. The time domain landscape is set to radically change in the coming decade, with synoptic all-sky surveys such as LSST providing huge numbers of transient detections on a nightly basis; transient detections across the electromagnetic spectrum from other major facilities such as SVOM, SKA and CTA; and the era of ‘multi-messenger astronomy’, wherein astro- physical events are detected via non-electromagnetic means, such as neutrino or gravitational wave emission. We describe here our plans for the Liverpool Telescope 2: a new robotic telescope designed to capitalise on this new era of time domain astronomy. LT2 will be a 4-metre class facility co-located with the Liverpool Telescope at the Observatorio del Roque de Los Muchachos on the Canary island of La Palma. The telescope will be designed for extremely C.M. Copperwheat · I.A. Steele · R.M. Barnsley · S.D. Bates · D. Bersier · M.F. Bode · D. -
Jorstad01.Pdf
THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 134:181È240, 2001 June V ( 2001. The American Astronomical Society. All rights reserved. Printed in U.S.A. MULTIEPOCH VERY LONG BASELINE ARRAY OBSERVATIONS OF EGRET-DETECTED QUASARS AND BL LACERTAE OBJECTS: SUPERLUMINAL MOTION OF GAMMA-RAY BRIGHT BLAZARS SVETLANA G. JORSTAD,1,2,3 ALAN P. MARSCHER,1 JOHN R. MATTOX,1,4 ANN E. WEHRLE,5 STEVEN D. BLOOM,6 AND ALEXEI V. YURCHENKO2 Received 2000 November 1; accepted 2001 January 24 ABSTRACT We present the results of a program to monitor the structure of the radio emission in 42 c-ray bright blazars (31 quasars and 11 BL Lac objects) with the Very Long Baseline Array (VLBA) at 43, 22, and occasionally 15 and 8.4 GHz, over the period from 1993 November to 1997 July. We determine proper motions in 33 sources and Ðnd that the apparent superluminal motions in c-ray sources are much faster than for the general population of bright compact radio sources. This follows the strong dependence of the c-ray Ñux on the level of relativistic beaming for both external radiation Compton and synchrotron self-Compton emission. There is a positive correlation (correlation coefficient r \ 0.45) between the Ñux density of the VLBI core and the c-ray Ñux and a moderate correlation (partial correlation coefficient r \ 0.31) between c-ray apparent luminosity and superluminal velocities of jet components, as expected if the c-ray emission originates in a very compact region of the relativistic jet and is highly beamed. In 43% of the sources the jet bends by more than 20¡ on parsec scales, which is consistent with ampliÐca- tion by projection e†ects of modest actual changes in position angle. -
The Fairy Tale of Nuclear Fusion L
The Fairy Tale of Nuclear Fusion L. J. Reinders The Fairy Tale of Nuclear Fusion 123 L. J. Reinders Panningen, The Netherlands ISBN 978-3-030-64343-0 ISBN 978-3-030-64344-7 (eBook) https://doi.org/10.1007/978-3-030-64344-7 © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2021 This work is subject to copyright. All rights are solely and exclusively licensed by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, expressed or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. This Springer imprint is published by the registered company Springer Nature Switzerland AG The registered company address is: Gewerbestrasse 11, 6330 Cham, Switzerland When you are studying any matter or considering any philosophy, ask yourself only what are the facts and what is the truth that the facts bear out. -
Event Horizon Telescope Fact Sheet
Event Horizon Telescope Fact Sheet The Event Horizon Telescope Collaboration The Event Horizon Telescope (EHT) is an international collaboration aiming to capture the first ever image of a black hole by creating a virtual Earth-sized telescope. This will test Einstein’s Theory of General Relativity in an extreme regime. The EHT consortium consists of 13 stakeholder institutes with about 200 participants in Europe, Asia, Africa, North and South America. The director of the EHT project is Dr. Sheperd S. Doeleman (Harvard- Smithsonian Center for Astrophysics). The technique applied for the EHT observations is called very-long-baseline interferometry (VLBI). VLBI enables the highest resolutions in astronomy by coupling a number of radio telescopes distributed across the Earth. This method is used for the investigation of the direct environment of supermassive black holes in the heart of active galaxies, in particular jets of high-energy particles emitted from the central regions. In the framework of the EHT project it will become possible to directly image the central black holes in addition to the jets. This is achieved by observations at shorter radio waves of only 1.3 mm wavelength. The resolution of the world-wide network of radio telescopes at that wavelength corresponds to the size of a tennis ball in the distance of the moon. To minimize the impact of the Earth’s atmosphere at that wavelength, the observations are only possible at high-altitude and dry sites like the Atacama desert in Chile, the Sierra Nevada in southern Spain, high volcanoes at Hawaii or even the South Pole. -
The 22 Month Swift-Bat All-Sky Hard X-Ray Survey
The Astrophysical Journal Supplement Series, 186:378–405, 2010 February doi:10.1088/0067-0049/186/2/378 C 2010. The American Astronomical Society. All rights reserved. Printed in the U.S.A. THE 22 MONTH SWIFT-BAT ALL-SKY HARD X-RAY SURVEY J. Tueller1, W. H. Baumgartner1,2,3, C. B. Markwardt1,3,4,G.K.Skinner1,3,4, R. F. Mushotzky1, M. Ajello5, S. Barthelmy1, A. Beardmore6, W. N. Brandt7, D. Burrows7, G. Chincarini8, S. Campana8, J. Cummings1, G. Cusumano9, P. Evans6, E. Fenimore10, N. Gehrels1, O. Godet6,D.Grupe7, S. Holland1,3,J.Kennea7,H.A.Krimm1,3,M.Koss1,3,4, A. Moretti8, K. Mukai1,2,3, J. P. Osborne6, T. Okajima1,11, C. Pagani7, K. Page6, D. Palmer10, A. Parsons1, D. P. Schneider7, T. Sakamoto1,12, R. Sambruna1, G. Sato13, M. Stamatikos1,12, M. Stroh7, T. Ukwata1,14, and L. Winter15 1 NASA/Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771, USA; [email protected] 2 Joint Center for Astrophysics, University of Maryland-Baltimore County, Baltimore, MD 21250, USA 3 CRESST/ Center for Research and Exploration in Space Science and Technology, 10211 Wincopin Circle, Suite 500, Columbia, MD 21044, USA 4 Department of Astronomy, University of Maryland College Park, College Park, MD 20742, USA 5 SLAC National Laboratory and Kavli Institute for Particle Astrophysics and Cosmology, 2575 Sand Hill Road, Menlo Park, CA 94025, USA 6 X-ray and Observational Astronomy Group/Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK 7 Department of Astronomy & Astrophysics, Pennsylvania -
Arxiv:2105.02272V1 [Astro-Ph.GA] 5 May 2021 Dominic W
Draft version May 7, 2021 Typeset using LATEX twocolumn style in AASTeX62 Polarimetric properties of Event Horizon Telescope targets from ALMA Ciriaco Goddi,1, 2 Ivan´ Mart´ı-Vidal,3, 4 Hugo Messias,5 Geoffrey C. Bower,6 Avery E. Broderick,7, 8, 9 Jason Dexter,10 Daniel P. Marrone,11 Monika Moscibrodzka,1 Hiroshi Nagai,12, 13 Juan Carlos Algaba,14 Keiichi Asada,15 Geoffrey B. Crew,16 Jose´ L. Gomez´ ,17 C. M. Violette Impellizzeri,2, 5 Michael Janssen,18 Matthias Kadler,19 Thomas P. Krichbaum,18 Rocco Lico,17, 18 Lynn D. Matthews,16 Antonios Nathanail,20, 21 Angelo Ricarte,22, 23 Eduardo Ros,18 Ziri Younsi,24, 20 Kazunori Akiyama,16, 12, 22, 25 Antxon Alberdi,17 Walter Alef,18 Richard Anantua,22, 23, 26 Rebecca Azulay,3, 4, 18 Anne-Kathrin Baczko,18 David Ball,11 Mislav Balokovic´,27, 28 John Barrett,16 Bradford A. Benson,29, 30 Dan Bintley,31 Lindy Blackburn,22, 23 Raymond Blundell,23 Wilfred Boland,32 Katherine L. Bouman,22, 23, 33 Hope Boyce,34, 35 Michael Bremer,36 Christiaan D. Brinkerink,1 Roger Brissenden,22, 23 Silke Britzen,18 Dominique Broguiere,36 Thomas Bronzwaer,1 Do-Young Byun,37, 38 John E. Carlstrom,39, 30, 40, 41 Andrew Chael,42 Chi-kwan Chan,11, 43 Shami Chatterjee,44 Koushik Chatterjee,45 Ming-Tang Chen,6 Yongjun Chen (H8军 ),46, 47 Paul M. Chesler,22 Ilje Cho,37, 38 Pierre Christian,48 John E. Conway,49 James M. Cordes,44 Thomas M. Crawford,30, 39 Alejandro Cruz-Osorio,20 Yuzhu Cui,50, 13 Jordy Davelaar,51, 26, 1 Mariafelicia De Laurentis,52, 20, 53 Roger Deane,54, 55, 56 Jessica Dempsey,31 Gregory Desvignes,57 Sheperd S.