Статья

Reflection Spectra of the Black Hole Binary Candidate MAXI J1535-571 in the Hard State Observed by NuSTAR

Y. XuCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAFiona A. HarrisonCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAJavier A. GarcíaCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAA. C. FabianInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UKF. FuerstEuropean Space Astronomy Centre (ESA/ESAC), Operations Department, Villanueva de la Cañada (Madrid), SpainP. GandhiDepartment of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 3RT, UKBrian W. GrefenstetteCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAKristin K. MadsenCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAJon M. MillerDepartment of Astronomy, University of Michigan, 1085 South University Avenue, Ann Arbor, MI 48109, USAM. L. ParkerEuropean Space Astronomy Centre (ESA/ESAC), Operations Department, Villanueva de la Cañada (Madrid), SpainJohn A. TomsickSpace Sciences Laboratory, 7 Gauss Way, University of California, Berkeley, CA 94720-7450, USAD. J. WaltonInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK

2018en

ABI

Аннотация

Abstract 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 α line and a Compton hump peaking around 30 keV. Detailed spectral modeling reveals a narrow Fe K α line complex centered around 6.5 keV on top of the strong relativistically broadened Fe K α 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 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 , inner disk radius , and a lamp-post height (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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Идентификаторы

DOI: 10.3847/2041-8213/aaa4b2

Цитирования и источники

Цитирований: 3Использованных источников: 0

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