Статья

NEW CONSTRAINTS ON THE BLACK HOLE LOW/HARD STATE INNER ACCRETION FLOW WITH NuSTAR

J. M. MillerDepartment of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109-1042, USA; [email protected]J. A. TomsickSpace Sciences Laboratory, University of California, Berkeley, CA 94720, USAMatteo BachettiCNRS, Intitut de Recherche in Astrophysique et Planetologie, 9 Av. Colonel Roche, BP 44346, F-31028 Toulouse, Cedex 4, FranceD. WilkinsDepartment of Astronomy & Physics, Saint Mary's University, Halifax, NS. B3H 3C3, CanadaS. E. BoggsSpace Sciences Laboratory, University of California, Berkeley, CA 94720, USAF. E. ChristensenDanish Technical University, DK-2800, Lyngby, DenmarkW. W. CraigColumbia University, New York, NY 10027, USAA. C. FabianInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 OHA, UKB. W. GrefenstetteCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAC. J. HaileyColumbia University, New York, NY 10027, USAF. A. HarrisonCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAE. KaraInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 OHA, UKA. L. KingDepartment of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109-1042, USA; [email protected]Daniel SternJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAW. W. ZhangNASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

2015en

ABI

Аннотация

We report on an observation of the Galactic black hole candidate GRS 1739–278 during its 2014 outburst, obtained with NuSTAR. The source was captured at the peak of a rising "low/hard" state, at a flux of ~0.3 Crab. A broad, skewed iron line and disk reflection spectrum are revealed. Fits to the sensitive NuSTAR spectra with a number of relativistically blurred disk reflection models yield strong geometrical constraints on the disk and hard X-ray "corona." Two models that explicitly assume a "lamp post" corona find its base to have a vertical height above the black hole of h = 5^(+7)_(-2) (GM)/c^(2) and h = 18 ± 4 GM/c ^2(90% confidence errors); models that do not assume a "lamp post" return emissivity profiles that are broadly consistent with coronae of this size. Given that X-ray microlensing studies of quasars and reverberation lags in Seyferts find similarly compact coronae, observations may now signal that compact coronae are fundamental across the black hole mass scale. All of the models fit to GRS 1739–278 find that the accretion disk extends very close to the black hole—the least stringent constraint is r_(in) = 5^(+3)_(-4) GM/c^(2). Only two of the models deliver meaningful spin constraints, but a = 0.8 ± 0.2 is consistent with all of the fits. Overall, the data provide especially compelling evidence of an association between compact hard X-ray coronae and the base of relativistic radio jets in black holes.

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Идентификаторы

DOI: 10.1088/2041-8205/799/1/l6

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Цитирований: 2Использованных источников: 0

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