Publication Date:
2014-07-06
Description:
Supermassive black holes in the nuclei of active galaxies expel large amounts of matter through powerful winds of ionized gas. The archetypal active galaxy NGC 5548 has been studied for decades, and high-resolution x-ray and ultraviolet (UV) observations have previously shown a persistent ionized outflow. An observing campaign in 2013 with six space observatories shows the nucleus to be obscured by a long-lasting, clumpy stream of ionized gas not seen before. It blocks 90% of the soft x-ray emission and causes simultaneous deep, broad UV absorption troughs. The outflow velocities of this gas are up to five times faster than those in the persistent outflow, and, at a distance of only a few light days from the nucleus, it may likely originate from the accretion disk.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaastra, J S -- Kriss, G A -- Cappi, M -- Mehdipour, M -- Petrucci, P-O -- Steenbrugge, K C -- Arav, N -- Behar, E -- Bianchi, S -- Boissay, R -- Branduardi-Raymont, G -- Chamberlain, C -- Costantini, E -- Ely, J C -- Ebrero, J -- Di Gesu, L -- Harrison, F A -- Kaspi, S -- Malzac, J -- De Marco, B -- Matt, G -- Nandra, K -- Paltani, S -- Person, R -- Peterson, B M -- Pinto, C -- Ponti, G -- Pozo Nunez, F -- De Rosa, A -- Seta, H -- Ursini, F -- de Vries, C P -- Walton, D J -- Whewell, M -- New York, N.Y. -- Science. 2014 Jul 4;345(6192):64-8. doi: 10.1126/science.1253787. Epub 2014 Jun 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, Netherlands. Department of Physics and Astronomy, Universiteit Utrecht, Post Office Box 80000, 3508 TA Utrecht, Netherlands. Leiden Observatory, Leiden University, Post Office Box 9513, 2300 RA Leiden, Netherlands. j.kaastra@sron.nl. ; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA. ; Istituto Nazionale di Astrofisica (INAF)-Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF) Bologna, Via Gobetti 101, I-40129 Bologna, Italy. ; SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, Netherlands. Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK. ; Universite Grenoble Alpes, Institut de Planetologie et d'Astrophysique de Grenoble (IPAG), F-38000 Grenoble, France. CNRS, IPAG, F-38000 Grenoble, France. ; Instituto de Astronomia, Universidad Catolica del Norte, Avenida Angamos 0610, Casilla 1280, Antofagasta, Chile. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK. ; Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA. ; Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel. ; Dipartimento di Matematica e Fisica, Universita degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy. ; Department of Astronomy, University of Geneva, 16 Chemin d'Ecogia, 1290 Versoix, Switzerland. ; Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK. ; SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, Netherlands. ; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA. ; SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, Netherlands. European Space Astronomy Centre, Post Office Box 78, E-28691 Villanueva de la Canada, Madrid, Spain. ; Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA. ; Universite de Toulouse, Universite Paul Sabatier (UPS)-Observatoire Midi-Pyrenees (OMP), Institut de Recherche en Astrophysique et Planelogie (IRAP), Toulouse, France. CNRS, IRAP, 9 Avenue colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France. ; Max-Planck-Institut fur extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany. ; 22 Impasse du Bois Joli, 74410 St. Jorioz, France. ; Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA. Center for Cosmology and AstroParticle Physics, Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA. ; Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK. ; Astronomisches Institut, Ruhr-Universitat Bochum, Universitatsstrasse 150, 44801, Bochum, Germany. ; INAF/Istituto di Astrofisica e Planetologia Spaziali, Via Fosso del Cavaliere 100, I-00133 Roma, Italy. ; Research Center for Measurement in Advanced Science, Faculty of Science, Rikkyo University 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo, Japan. Department of Physics, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24994647" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
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Medicine
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Natural Sciences in General
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Physics
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