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Author Corrales, L. R. ♦ Mon, B. ♦ Haggard, D. ♦ Baganoff, F. K. ♦ Garmire, G. ♦ Degenaar, N. ♦ Reynolds, M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ BRIGHTNESS ♦ COMPARATIVE EVALUATIONS ♦ COSMIC X-RAY BURSTS ♦ DETECTION ♦ DUSTS ♦ EVOLUTION ♦ EXTRACTION ♦ GALAXIES ♦ HYPOTHESIS ♦ MASS ♦ SCATTERING ♦ SURFACES ♦ X RADIATION
Abstract We report the detection of a dust-scattering halo around a recently discovered X-ray transient, Swift J174540.7–290015, which in early 2016 February underwent one of the brightest outbursts ( F {sub X} ≈ 5 × 10{sup −10} erg cm{sup −2} s{sup −1}) observed from a compact object in the Galactic Center field. We analyze four Chandra images that were taken as follow-up observations to Swift discoveries of new Galactic Center transients. After adjusting our spectral extraction for the effects of detector pile-up, we construct a point-spread function for each observation and compare it to the GC field before the outburst. We find residual surface brightness around Swift J174540.7–290015, which has a shape and temporal evolution consistent with the behavior expected from X-rays scattered by foreground dust. We examine the spectral properties of the source, which shows evidence that the object transitioned from a soft to hard spectral state as it faded below L {sub X} ∼ 10{sup 36} erg s{sup −1}. This behavior is consistent with the hypothesis that the object is a low-mass X-ray binary in the Galactic Center.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-04-20
Publisher Place United States
Journal Astrophysical Journal
Volume Number 839
Issue Number 2


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