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The Long-stable Hard State of XTE J1752-223 and the Disk Truncation Dilemma

Connors, Riley M. T. and García, Javier A. and Tomsick, John and Mastroserio, Guglielmo and Grinberg, Victoria and Steiner, James F. and Jiang, Jiachen and Fabian, Andrew C. and Parker, Michael L. and Harrison, Fiona and Hare, Jeremy and Mallick, Labani and Lazar, Hadar (2022) The Long-stable Hard State of XTE J1752-223 and the Disk Truncation Dilemma. Astrophysical Journal, 935 (2). p. 118. ISSN 0004-637X. doi:10.3847/1538-4357/ac7ff2.

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The degree to which the thin accretion disks of black hole X-ray binaries are truncated during hard spectral states remains a contentious open question in black hole astrophysics. During its singular observed outburst in 2009–2010, the black hole X-ray binary XTE J1752−223 spent ∼1 month in a long-stable hard spectral state at a luminosity of ∼0.02–0.1 L_Edd. It was observed with 56 RXTE pointings during this period, with simultaneous Swift-XRT daily coverage during the first 10 days of the RXTE observations. While reflection modeling has been extensively explored in the analysis of these data, there is disagreement surrounding the geometry of the accretion disk and corona implied by the reflection features. We reexamine the combined, high signal-to-noise, simultaneous Swift and RXTE observations, and perform extensive reflection modeling with the latest relxill suite of reflection models, including newer high disk density models. We show that reflection modeling requires that the disk be within ∼5 R_ISCO during the hard spectral state, while weaker constraints from the thermal disk emission imply higher truncation (R_in = 6–80 R_ISCO). We also explore more complex coronal continuum models, allowing for two Comptonization components instead of one, and show that the reflection features still require only a mildly truncated disk. Finally we present a full comparison of our results to previous constraints found from analyses of the same data set.

Item Type:Article
Related URLs:
URLURL TypeDescription Article
Connors, Riley M. T.0000-0002-8908-759X
García, Javier A.0000-0003-3828-2448
Tomsick, John0000-0001-5506-9855
Mastroserio, Guglielmo0000-0003-4216-7936
Grinberg, Victoria0000-0003-2538-0188
Steiner, James F.0000-0002-5872-6061
Jiang, Jiachen0000-0002-9639-4352
Fabian, Andrew C.0000-0002-9378-4072
Parker, Michael L.0000-0002-8466-7317
Harrison, Fiona0000-0003-2992-8024
Hare, Jeremy0000-0002-8548-482X
Mallick, Labani0000-0001-8624-9162
Lazar, Hadar0000-0002-2752-9524
Additional Information:J.A.G. acknowledges support from NASA grant NNX15AV31G and from the Alexander von Humboldt Foundation. R.M.T.C. has been supported by NASA grant 80NSSC177K0515. J.J. acknowledges support from the Leverhulme Trust, the Isaac Newton Trust, and St. Edmund's College, University of Cambridge. J.H. acknowledges support from an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by the ORAU through a contract with NASA. This research has made use of data, software, and/or web tools obtained from HEASARC, a service of the Astrophysics Science Division at NASA/GSFC and of the Smithsonian Astrophysical Observatory's High Energy Astrophysics Division. This research has made use of ISIS functions (ISISscripts) provided by ECAP/Remeis Observatory and MIT ( Facilities: RXTE (PCA: Jahoda et al. 1996; HEXTE: Rothschild et al. 1998), Swift-XRT (Burrows et al. 2005), HEASARC, HEASoft. Software: XSPEC v.12.10.1s (Arnaud 1996), XILLVER (García & Kallman 2010; García et al. 2013), RELXILL (v1.3.11-5dev; García et al. 2014; Dauser et al. 2014).
Group:Astronomy Department
Funding AgencyGrant Number
NASA ∣ GSFC ∣ Astrophysics Science DivisionNNX15AV31G
NASA ∣ GSFC ∣ Astrophysics Science Division80NSSC177K0515
Alexander von Humboldt FoundationUNSPECIFIED
Leverhulme TrustUNSPECIFIED
Isaac Newton TrustUNSPECIFIED
St. Edmund's College, University of CambridgeUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20220908-183016086
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116617
Deposited By: Donna Wrublewski
Deposited On:07 Sep 2022 22:18
Last Modified:08 Sep 2022 18:31

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