New constraints on the black hole low/hard state inner accretion flow with NuSTAR

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dc.creator Miller, J. M.
dc.creator Tomsick, J. A.
dc.creator Bachetti, M.
dc.creator Wilkins, D. R.
dc.creator Boggs, S. E.
dc.creator Christensen, F. E.
dc.creator Craig, W. W.
dc.creator Fabian, A. C.
dc.creator Grefenstette, B. W.
dc.creator Hailey, C. J.
dc.date.accessioned 2017-04-06T15:05:50Z
dc.date.available 2017-04-06T15:05:50Z
dc.date.issued 2015-01-20
dc.identifier.issn 2041-8205
dc.identifier.uri http://library2.smu.ca/handle/01/26876
dc.description Publisher's version/PDF en_CA
dc.description.abstract 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[superscript +7][subscript −2] GM/c[superscript 2] and h = 18 [plus or minus] 4 GM/c[superscript 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[subscript in] = 5[superscript +3][subscript −4] GM/c[superscript 2]. Only two of the models deliver meaningful spin constraints, but a = 0.8 [plus or minus] 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. en_CA
dc.description.provenance Submitted by Janine Mills (janine.mills@smu.ca) on 2017-04-06T15:05:50Z No. of bitstreams: 1 Wilkins_D_article_2015.pdf: 694881 bytes, checksum: 28e59e404d7ac13a7a20f85304a8c368 (MD5) en
dc.description.provenance Made available in DSpace on 2017-04-06T15:05:50Z (GMT). No. of bitstreams: 1 Wilkins_D_article_2015.pdf: 694881 bytes, checksum: 28e59e404d7ac13a7a20f85304a8c368 (MD5) Previous issue date: 2015-01-20 en
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.relation.uri http://dx.doi.org/10.1088/2041-8205/799/1/L6
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Accretion (Astrophysics)
dc.subject.lcsh X-ray sources, Galactic -- Accretion
dc.subject.lcsh Black holes (Astronomy)
dc.title New constraints on the black hole low/hard state inner accretion flow with NuSTAR en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal Letters 799(1), L6. (2015) en_CA
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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1088/2041-8205/799/1/L6
 
 

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