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Title: DISCOVERY AND EVOLUTION OF THE NEW BLACK HOLE CANDIDATE SWIFT J1539.2-6227 DURING ITS 2008 OUTBURST

Abstract

We report on the discovery by the Swift Gamma-Ray Burst Explorer of the black hole (BH) candidate Swift J1539.2-6227 and the subsequent course of an outburst beginning in 2008 November and lasting at least seven months. The source was discovered during normal observations with the Swift Burst Alert Telescope on 2008 November 25. An extended observing campaign with the Rossi X-Ray Timing Explorer and Swift provided near-daily coverage over 176 days, giving us a good opportunity to track the evolution of spectral and timing parameters with fine temporal resolution through a series of spectral states. The source was first detected in a hard state during which strong low-frequency quasi-periodic oscillations (QPOs) were detected. The QPOs persisted for about 35 days and a signature of the transition from the hard- to soft-intermediate states was seen in the timing data. The source entered a short-lived thermal state about 40 days after the start of the outburst. There were variations in spectral hardness as the source flux declined and returned to a hard state at the end of the outburst. The progression of spectral states and the nature of the timing features provide strong evidence that Swift J1539.2-6227 is a candidate BH inmore » a low-mass X-ray binary system.« less

Authors:
 [1];  [2];  [3];  [4]; ;  [5];  [6]
  1. CRESST and NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  2. Space Science Laboratory, University of California, 7 Gauss Way, Berkeley, CA 94720-7450 (United States)
  3. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  4. Mullard Space Science Laboratory, University College London, Holmburg St. Mary, Dorking, Surrey RH5 6NT (United Kingdom)
  5. Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242 (United States)
  6. INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Via U. La Malfa 153, I-90146 Palermo (Italy)
Publication Date:
OSTI Identifier:
21578393
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 735; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/735/2/104; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; COSMIC GAMMA BURSTS; EVOLUTION; OSCILLATIONS; COSMIC RADIATION; IONIZING RADIATIONS; PRIMARY COSMIC RADIATION; RADIATIONS

Citation Formats

Krimm, H. A., Tomsick, J. A., Markwardt, C. B., Brocksopp, C., Grise, F., Kaaret, P., and Romano, P. DISCOVERY AND EVOLUTION OF THE NEW BLACK HOLE CANDIDATE SWIFT J1539.2-6227 DURING ITS 2008 OUTBURST. United States: N. p., 2011. Web. doi:10.1088/0004-637X/735/2/104.
Krimm, H. A., Tomsick, J. A., Markwardt, C. B., Brocksopp, C., Grise, F., Kaaret, P., & Romano, P. DISCOVERY AND EVOLUTION OF THE NEW BLACK HOLE CANDIDATE SWIFT J1539.2-6227 DURING ITS 2008 OUTBURST. United States. doi:10.1088/0004-637X/735/2/104.
Krimm, H. A., Tomsick, J. A., Markwardt, C. B., Brocksopp, C., Grise, F., Kaaret, P., and Romano, P. Sun . "DISCOVERY AND EVOLUTION OF THE NEW BLACK HOLE CANDIDATE SWIFT J1539.2-6227 DURING ITS 2008 OUTBURST". United States. doi:10.1088/0004-637X/735/2/104.
@article{osti_21578393,
title = {DISCOVERY AND EVOLUTION OF THE NEW BLACK HOLE CANDIDATE SWIFT J1539.2-6227 DURING ITS 2008 OUTBURST},
author = {Krimm, H. A. and Tomsick, J. A. and Markwardt, C. B. and Brocksopp, C. and Grise, F. and Kaaret, P. and Romano, P.},
abstractNote = {We report on the discovery by the Swift Gamma-Ray Burst Explorer of the black hole (BH) candidate Swift J1539.2-6227 and the subsequent course of an outburst beginning in 2008 November and lasting at least seven months. The source was discovered during normal observations with the Swift Burst Alert Telescope on 2008 November 25. An extended observing campaign with the Rossi X-Ray Timing Explorer and Swift provided near-daily coverage over 176 days, giving us a good opportunity to track the evolution of spectral and timing parameters with fine temporal resolution through a series of spectral states. The source was first detected in a hard state during which strong low-frequency quasi-periodic oscillations (QPOs) were detected. The QPOs persisted for about 35 days and a signature of the transition from the hard- to soft-intermediate states was seen in the timing data. The source entered a short-lived thermal state about 40 days after the start of the outburst. There were variations in spectral hardness as the source flux declined and returned to a hard state at the end of the outburst. The progression of spectral states and the nature of the timing features provide strong evidence that Swift J1539.2-6227 is a candidate BH in a low-mass X-ray binary system.},
doi = {10.1088/0004-637X/735/2/104},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 735,
place = {United States},
year = {2011},
month = {7}
}