Galactic Sources Detected in the NuSTAR Serendipitous Survey

被引：6

作者：

Tomsick, John A. ^{[1
]}

Lansbury, George B. ^{[2
]}

Rahoui, Farid ^{[3
]}

Clavel, Maica ^{[1
]}

Fornasini, Francesca M. ^{[4
]}

Hong, JaeSub ^{[4
]}

Aird, James ^{[2
]}

Alexander, David M. ^{[5
]}

Bodaghee, Arash ^{[6
]}

Chiu, Jeng-Lun ^{[1
]}

Grindlay, Jonathan E. ^{[4
]}

Hailey, Charles J. ^{[7
]}

Harrison, Fiona A. ^{[8
]}

Krivonos, Roman A. ^{[9
]}

Mori, Kaya ^{[7
]}

Stern, Daniel ^{[10
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, 7 Gauss Way, Berkeley, CA 94720 USA

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

[3] Harvard Univ, Dept Astron, 60 Garden St, Cambridge, MA 02138 USA

[4] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[5] Univ Durham, Dept Phys, Ctr Extragalact Astron, South Rd, Durham DH1 3LE, England

[6] Georgia Coll & State Univ, Milledgeville, GA 31061 USA

[7] Columbia Univ, Columbia Astrophys Lab, 538 W 120th St, New York, NY 10027 USA

[8] CALTECH, 1200 East Calif Blvd, Pasadena, CA 91125 USA

[9] Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia

[10] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2017年 / 230卷 / 02期

基金：

美国国家航空航天局; 俄罗斯科学基金会;

关键词：

stars: black holes; stars: neutron; surveys; white dwarfs; X-rays: stars; X-RAY-EMISSION; CATACLYSMIC VARIABLES; LUMINOSITY FUNCTION; EXTRAGALACTIC SURVEY; DATA RELEASE; CATALOG; BINARIES; STAR; SKY; POPULATION;

D O I：

10.3847/1538-4365/aa7517

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Nuclear Spectroscopic Telescope Array (NuSTAR) provides an improvement in sensitivity at energies above 10 keV by two orders of magnitude over non-focusing satellites, making it possible to probe deeper into the Galaxy and universe. Lansbury and collaborators recently completed a catalog of 497 sources serendipitously detected in the 3-24 keV band using 13 deg(2) of NuSTAR coverage. Here, we report on an optical and X-ray study of 16 Galactic sources in the catalog. We identify 8 of them as stars (but some or all could have binary companions), and use information from Gaia to report distances and X-ray luminosities for 3 of them. There are 4 CVs or CV candidates, and we argue that NuSTAR J233426-2343.9 is a relatively strong CV candidate based partly on an X-ray spectrum from XMM-Newton. NuSTAR J092418-3142.2, which is the brightest serendipitous source in the Lansbury catalog, and NuSTAR J073959-3147.8 are low-mass X-ray binary candidates, but it is also possible that these 2. sources are CVs. One of the sources is a known high-mass X-ray binary (HMXB), and NuSTAR J105008-5958.8 is a new HMXB candidate that. has strong Balmer emission lines in its optical spectrum and a hard X-ray spectrum. We discuss the implications of finding these HMXBs for the surface density (log N-log S) and luminosity function of Galactic HMXBs. We conclude that. with the large fraction of unclassified sources in the Galactic plane detected by NuSTAR in the 8-24 keV band, there could be a significant population of low-luminosity HMXBs.

引用

页数：16

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