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The NuSTAR Hard X-Ray Survey of the Norma Arm Region

Journal Article · · The Astrophysical Journal. Supplement Series (Online)
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  1. Univ. of California, Berkeley, CA (United States)
  2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  3. Columbia Univ., New York, NY (United States). Columbia Astrophysics Lab.
  4. Pontificia Univ. Catolica de Chile, Santiago (Chile); Millenium Inst. of Astrophysics, Santiago (Chile); Space Science Inst., Boulder, CO (United States)
  5. European Southern Observatory, Munchen (Germany)
  6. California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Jet Propulsion Lab.
  7. Georgia College, Milledgeville, GA (United States)
  8. Pontificia Univ. Catolica de Chile, Santiago (Chile)
  9. Univ. of California, Berkeley, CA (United States); Russia Academy of Sciences, Moscow (Russia)
  10. Durham Univ. (United Kingdom)
  11. Univ. of Toulouse (France)
  12. Technical Univ. of Denmark, Lyngby (Denmark)
  13. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  14. California Inst. of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astrophysics
  15. ASI Science Data Center (ASDC), Rome (Italy)
  16. Hiroshima Univ. (Japan)
  17. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  18. ASI Science Data Center (ASDC), Rome (Italy); Istituto Nazionale di Astrofisica (INAF), Monteporzio (Italy). Astronomica di Roma
  19. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  20. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
+ Show Author Affiliations
We present a catalog of hard X-ray sources in a square-degree region surveyed by NuSTAR in the direction of the Norma spiral arm. This survey has a total exposure time of 1.7 Ms, and typical and maximum exposure depths of 50 ks and 1 Ms, respectively. In the area of deepest coverage, sensitivity limits of 5 x 10-14 and 4 x 10-14 erg s-1 cm-2 in the 3–10 and 10–20 keV bands, respectively, are reached. Twenty-eight sources are firmly detected and ten are detected with low significance; eight of the 38 sources are expected to be active galactic nuclei. The three brightest sources were previously identified as a low-mass X-ray binary, high-mass X-ray binary, and pulsar wind nebula. Based on their X-ray properties and multi-wavelength counterparts, we identify the likely nature of the other sources as two colliding wind binaries, three pulsar wind nebulae, a black hole binary, and a plurality of cataclysmic variables (CVs). The CV candidates in the Norma region have plasma temperatures of ≈10–20 keV, consistent with the Galactic Ridge X-ray emission spectrum but lower than temperatures of CVs near the Galactic Center. This temperature difference may indicate that the Norma region has a lower fraction of intermediate polars relative to other types of CVs compared to the Galactic Center. The NuSTAR logN-logS distribution in the 10–20 keV band is consistent with the distribution measured by Chandra at 2–10 keV if the average source spectrum is assumed to be a thermal model with kT ≈ 15 keV, as observed for the CV candidates.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1361155
Alternate ID(s):
OSTI ID: 22661128
Journal Information:
The Astrophysical Journal. Supplement Series (Online), Journal Name: The Astrophysical Journal. Supplement Series (Online) Journal Issue: 2 Vol. 229; ISSN 1538-4365
Publisher:
American Astronomical Society/IOPCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Flux Relaxation after Two Outbursts of the Magnetar SGR 1627–41 and Possible Hard X-Ray Emission journal May 2018
Origin of a Massive Hyper-runaway Subgiant Star LAMOST-HVS1: Implication from Gaia and Follow-up Spectroscopy journal March 2019
Neutron Stars and Black Holes in the Small Magellanic Cloud: The SMC NuSTAR Legacy Survey journal October 2019
The Galactic Bulge Diffuse Emission in Broadband X-Rays with NuSTAR journal October 2019
NuSTAR Observations of the Unidentified INTEGRAL Sources: Constraints on the Galactic Population of HMXBs journal December 2019
The Galactic Bulge Diffuse Emission in Broad-Band X-rays with NuSTAR text January 2019

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79 ASTRONOMY AND ASTROPHYSICS