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NuSTAR AND SWIFT OBSERVATIONS OF THE VERY HIGH STATE IN GX 339-4: WEIGHING THE BLACK HOLE WITH X-RAYS

M. L. ParkerInstitute of Astronomy, Madingley Road, Cambridge CB3 0HA, UKJohn A. TomsickSpace Sciences Laboratory, University of California, Berkeley, 7 Gauss Way, Berkeley, CA 94720-7450, USAJ. A. KenneaDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USAJ. M. MïllerDepartment of Astronomy, University of Michigan, 1085 South University Avenue, West Hall 311, Ann Arbor, MI 48109-1042, USAFiona A. HarrisonCalifornia Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USAD. BarretInstitut de Recherche en Astrophysique et Planétologie, 9 Avenue du Colonel Roche, F-31028 Toulouse, FranceSteven E. BoggsSpace Sciences Laboratory, University of California, Berkeley, 7 Gauss Way, Berkeley, CA 94720-7450, USAFinn E. ChristensenDanish Technical University, DK-2800 Lyngby, DenmarkWilliam W. CraigLawrence Livermore National Laboratory, Livermore, CA, USAA. C. FabianInstitute of Astronomy, Madingley Road, Cambridge CB3 0HA, UKFelix FürstCalifornia Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USAV. GrinbergMassachusetts Institute of Technology, Kavli Institute for Astrophysics, Cambridge, MA 02139, USACharles J. HaileyColumbia University, New York, NY 10027, USAP. RomanoINAF-IASF Palermo, Via Ugo La Malfa 153, I-90146 Palermo, ItalyDaniel SternJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAD. J. WaltonJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USAW. W. ZhangNASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

2016en

ABI

Annotatsiya

ABSTRACT We present results from spectral fitting of the very high state of GX 339-4 with Nuclear Spectroscopic Telescope Array ( NuSTAR ) and Swift . We use relativistic reflection modeling to measure the spin of the black hole and inclination of the inner disk and find a spin of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>a</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>0.95</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.08</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.02</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> and inclination of 30° ± 1° (statistical errors). These values agree well with previous results from reflection modeling. With the exceptional sensitivity of NuSTAR at the high-energy side of the disk spectrum, we are able to constrain multiple physical parameters simultaneously using continuum fitting. By using the constraints from reflection as input for the continuum fitting method, we invert the conventional fitting procedure to estimate the mass and distance of GX 339-4 using just the X-ray spectrum, finding a mass of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>9.0</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1.2</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>1.6</mml:mn> </mml:mrow> </mml:msubsup> <mml:mspace width="0.25em"/> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>⊙</mml:mo> </mml:mrow> </mml:msub> </mml:math> and distance of 8.4 ± 0.9 kpc (statistical errors).

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DOI: 10.3847/2041-8205/821/1/l6

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