期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 852, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aaa4b2
关键词
accretion, accretion disks; black hole physics; X-rays: binaries
资金
- STFC
- NASA [80NSSC17K0515, NNG08FD60C]
- Alexander von Humboldt Foundation
- National Aeronautics and Space Administration
- Science and Technology Facilities Council [ST/N000927/1] Funding Source: researchfish
- STFC [ST/N004027/1] Funding Source: UKRI
We report on a Nuclear Spectroscopic Telescope Array (NuSTAR) observation of the recently discovered bright black hole candidate MAXI. J1535-571. NuSTAR observed the source on MJD 58003 (five days after the outburst was reported). The spectrum is characteristic of a black hole binary in the hard state. We observe clear disk reflection features, including a broad Fe K alpha line and a Compton hump peaking around 30 keV. Detailed spectral modeling reveals a narrow Fe K alpha line complex centered around 6.5 keV on top of the strong relativistically broadened Fe K alpha line. The narrow component is consistent with distant reflection from moderately ionized material. The spectral continuum is well described by a combination of cool thermal disk photons and a Comptonized plasma with the electron temperature kT(e) = 19.7 +/- 0.4 keV. An adequate fit can be achieved for the disk reflection features with a self-consistent relativistic reflection model that assumes a lamp-post geometry for the coronal illuminating source. The spectral fitting measures a black hole spin a > 0.84, inner disk radius R-in < 2.01 r(ISCO), and a lamp-post height h = 7.2(-2.0)(+0.8) r(g) (statistical errors, 90% confidence), indicating no significant disk truncation and a compact corona. Although the distance and mass of this source are not currently known, this suggests the source was likely in the brighter phases of the hard state during this NuSTAR observation.
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