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Title: Galactic Sources Detected in the NuSTAR Serendipitous Survey

Abstract

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{sup 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 surfacemore » 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.« less

Authors:
; ;  [1]; ;  [2];  [3]; ; ;  [4];  [5];  [6]; ;  [7];  [8];  [9];  [10]
  1. Space Sciences Laboratory, 7 Gauss Way, University of California, Berkeley, CA 94720-7450 (United States)
  2. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom)
  3. Department of Astronomy, Harvard University, 60 Garden Street, Cambridge, MA 02138 (United States)
  4. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  5. Centre for Extragalactic Astronomy, Department of Physics, University of Durham, South Road, Durham DH1 3LE (United Kingdom)
  6. Georgia College and State University, Milledgeville, GA 31061 (United States)
  7. Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States)
  8. California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  9. Space Research Institute of the Russian Academy of Sciences, Profsoyuznaya Str. 84/32, 117997, Moscow (Russian Federation)
  10. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States)
Publication Date:
OSTI Identifier:
22661114
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal, Supplement Series; Journal Volume: 230; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; CATALOGS; DENSITY; HARD X RADIATION; KEV RANGE; LUMINOSITY; MASS; MILKY WAY; PROBES; SATELLITES; SENSITIVITY; SURFACES; TELESCOPES; UNIVERSE; WHITE DWARF STARS; X-RAY SPECTRA

Citation Formats

Tomsick, John A., Clavel, Maïca, Chiu, Jeng-Lun, Lansbury, George B., Aird, James, Rahoui, Farid, Fornasini, Francesca M., Hong, JaeSub, Grindlay, Jonathan E., Alexander, David M., Bodaghee, Arash, Hailey, Charles J., Mori, Kaya, Harrison, Fiona A., Krivonos, Roman A., and Stern, Daniel. Galactic Sources Detected in the NuSTAR Serendipitous Survey. United States: N. p., 2017. Web. doi:10.3847/1538-4365/AA7517.
Tomsick, John A., Clavel, Maïca, Chiu, Jeng-Lun, Lansbury, George B., Aird, James, Rahoui, Farid, Fornasini, Francesca M., Hong, JaeSub, Grindlay, Jonathan E., Alexander, David M., Bodaghee, Arash, Hailey, Charles J., Mori, Kaya, Harrison, Fiona A., Krivonos, Roman A., & Stern, Daniel. Galactic Sources Detected in the NuSTAR Serendipitous Survey. United States. doi:10.3847/1538-4365/AA7517.
Tomsick, John A., Clavel, Maïca, Chiu, Jeng-Lun, Lansbury, George B., Aird, James, Rahoui, Farid, Fornasini, Francesca M., Hong, JaeSub, Grindlay, Jonathan E., Alexander, David M., Bodaghee, Arash, Hailey, Charles J., Mori, Kaya, Harrison, Fiona A., Krivonos, Roman A., and Stern, Daniel. Thu . "Galactic Sources Detected in the NuSTAR Serendipitous Survey". United States. doi:10.3847/1538-4365/AA7517.
@article{osti_22661114,
title = {Galactic Sources Detected in the NuSTAR Serendipitous Survey},
author = {Tomsick, John A. and Clavel, Maïca and Chiu, Jeng-Lun and Lansbury, George B. and Aird, James and Rahoui, Farid and Fornasini, Francesca M. and Hong, JaeSub and Grindlay, Jonathan E. and Alexander, David M. and Bodaghee, Arash and Hailey, Charles J. and Mori, Kaya and Harrison, Fiona A. and Krivonos, Roman A. and Stern, Daniel},
abstractNote = {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{sup 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.},
doi = {10.3847/1538-4365/AA7517},
journal = {Astrophysical Journal, Supplement Series},
number = 2,
volume = 230,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}