CONSTRAINTS ON THE NEUTRON STAR AND INNER ACCRETION FLOW IN SERPENS X-1 USING NuSTAR
CONSTRAINTS ON THE NEUTRON STAR AND INNER ACCRETION FLOW IN SERPENS X-1 USING NuSTAR
复制标题
使用 NuSTAR 对 SERPENS X-1 中子星和内吸积流的约束
DOI:
10.1088/2041-8205/779/1/l2
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Miller J
中科院分区:
文献类型:
--
作者:
Miller J
We report on an observation of the neutron star low-mass X-ray binary Serpens X-1, made with NuSTAR. The extraordinary sensitivity afforded by NuSTAR facilitated the detection of a clear, robust, relativistic Fe K emission line from the inner disk. A relativistic profile is required over a single Gaussian line from any charge state of Fe at the 5σ level of confidence, and any two Gaussians of equal width at the same confidence. The Compton back-scattering" hump" peaking in the 10–20 keV band is detected for the first time in a neutron star X-ray binary. Fits with relativistically blurred disk reflection models suggest that the disk likely extends close to the innermost stable circular orbit (ISCO) or stellar surface. The best-fit blurred reflection models constrain the gravitational redshift from the stellar surface to be z NS⩾ 0.16. The data are broadly compatible with the disk extending to the ISCO; in that case, z NS⩾ 0.22 and R NS⩽ 12.6 km (assuming M NS= 1.4 M☉ and a= 0, where a= cJ/GM 2). If the star is as large or larger than its ISCO, or if the effective reflecting disk leaks across the ISCO to the surface, the redshift constraints become measurements. We discuss our results in the context of efforts to measure fundamental properties of neutron stars, and models for accretion onto compact objects.
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DOI:
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发表时间:
2008
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影响因子:
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作者:
A. D’Aì;R. Iaria;T. D. Salvo;G. Matt;N. Robba
通讯作者:
N. Robba
DOI:
--
发表时间:
2012
期刊:
影响因子:
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作者:
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通讯作者:
D. Barret
DOI:
10.1088/0004-637x/720/1/205
发表时间:
2009-08
期刊:
The Astrophysical Journal
影响因子:
--
作者:
E. Cackett
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E. Cackett
DOI:
--
发表时间:
2012
期刊:
影响因子:
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作者:
E. Egron;T. Salvo;S. Motta;L. Burderi;A. Papitto;R. Duro;A. D’Aì;A. Riggio;T. Belloni;R. Iaria;N. Robba;S. Piraino;A. Santangelo
通讯作者:
A. Santangelo
DOI:
10.1088/2041-8205/775/2/l45
发表时间:
2013-08
期刊:
The Astrophysical Journal Letters
影响因子:
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作者:
J. Miller;M. Parker;F. Fuerst;M. Bachetti;F. Harrison;D. Barret;S. Boggs;D. Chakrabarty;F. Chris
通讯作者:
J. Miller;M. Parker;F. Fuerst;M. Bachetti;F. Harrison;D. Barret;S. Boggs;D. Chakrabarty;F. Chris