Detection of Reflection Features in the Neutron Star Low-mass X-Ray Binary Serpens X-1 with NICER

被引：62

作者：

Ludlam, R. M. ^{[1
]}

Miller, J. M. ^{[1
]}

Arzoumanian, Z. ^{[2
]}

Bult, P. M. ^{[2
]}

Cackett, E. M. ^{[3
]}

Chakrabarty, D. ^{[4
]}

Enoto, T. ^{[5
]}

Fabian, A. C. ^{[6
]}

Gendreau, K. C. ^{[2
]}

Guillot, S. ^{[7
,8
]}

Homan, J. ^{[9
,10
]}

Jaisawal, G. K. ^{[11
]}

Keek, L. ^{[12
]}

La Marr, B. ^{[4
]}

Malacaria, C. ^{[13
,14
]}

Markwardt, C. B. ^{[2
]}

Steiner, J. F. ^{[4
]}

Strohmayer, T. E. ^{[2
]}

机构：

[1] Univ Michigan, Dept Astron, 1085 South Univ Ave, Ann Arbor, MI 48109 USA

[2] NASA, GSFC, Astrophys Sci Div, X Ray Astrophys Lab, Greenbelt, MD 20771 USA

[3] Wayne State Univ, Dept Phys & Astron, 666 West Hancock St, Detroit, MI 48201 USA

[4] MIT, MIT Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[5] Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan

[6] Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[7] CNRS, IRAP, 9 Ave Colonel Roche,BP 44346, F-31028 Toulouse 4, France

[8] Univ Toulouse, CNES, UPS OMP, F-31028 Toulouse, France

[9] Eureka Sci Inc, 2452 Delmer St, Oakland, CA 94602 USA

[10] SRON Netherlands Inst Space Res, SRON, Sorbonnelaan 2, NL-3584 CA Utrecht, Netherlands

[11] Tech Univ Denmark, Natl Space Inst, Elektrovej 327-328, DK-2800 Lyngby, Denmark

[12] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[13] NASA, Marshall Space Flight Ctr, NSSTC, 320 Sparkman Dr, Huntsville, AL 35805 USA

[14] Univ Space Res Assoc, NSSTC, 320 Sparkman Dr, Huntsville, AL 35805 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2018年 / 858卷 / 01期

基金：

欧洲研究理事会;

关键词：

accretion; accretion disks; stars: individual (Ser X-1); stars: neutron; X-rays: binaries; INNER ACCRETION DISKS; SPECTRAL MODELS; EMISSION-LINES; ABSORPTION;

D O I：

10.3847/2041-8213/aabee6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Neutron Star Interior Composition Explorer (NICER) observations of the neutron star (NS) low-mass X-ray binary Serpens X-1 during the early mission phase in 2017. With the high spectral sensitivity and low-energy X-ray passband of NICER, we are able to detect the Fe L line complex in addition to the signature broad, asymmetric Fe K line We confirm the presence of these lines by comparing the NICER data to archival observations with XMM-Newton/Reflection Grating Spectrometer (RGS) and NuSTAR. Both features originate close to the innermost stable circular orbit (ISCO). When modeling the lines with the relativistic line model RELLINE, we find that the Fe. L blend requires an inner disk radius of 1.4(-0.1)(+0.2) R-ISCO and Fe K is at 1.03(-0.03)(+0.13) R-ISCO (errors quoted at 90%). This corresponds to a position of 17.3(-1.2)(+2.5) km and 12.7(-0.4)(+1.6) km for a canonical NS mass (M-NS = 1.4 M-circle dot) and dimensionless spin value of a = 0. Additionally, we employ a new version of the RELXILL model tailored for NSs and determine that these features arise from a dense disk and supersolar Fe abundance.

引用

页数：6

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