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THE NuSTAR Hard X-Ray Survey of the Norma Arm RegionWe present a catalog of hard X-ray sources in a square-degree region surveyed by the Nuclear Spectroscopic Telescope Array (NuSTAR) in the direction of the Norma spiral arm. This survey has a total exposure time of 1.7 Ms, and the typical and maximum exposure depths are 50 ks and 1 Ms, respectively. In the area of deepest coverage, sensitivity limits of 5 x 10(exp -14) and 4 x 10(exp -14) ergs/s/sq cm in the 3-10 and 10-20 keV bands, respectively, are reached. Twenty-eight sources are firmly detected, and 10 are detected with low significance; 8 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 multiwavelength 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 approx. 10-20 keV, consistent with the Galactic ridge X-ray emission spectrum but lower than the 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 10-20keV 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 approx. =15 keV, as observed for the CV candidates.
Document ID
20170006064
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Fornasini, Francesca M.
(California Univ. Berkeley, CA, United States)
Tomsick, John A.
(California Univ. Berkeley, CA, United States)
Hong, Jaesub
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Gotthelf, Eric V.
(Columbia Univ. New York, NY, United States)
Bauer, Franz
(Space Science Inst. Boulder, CO, United States)
Rahoui, Farid
(European Southern Observatory Munich, Germany)
Stern, Daniel K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bodaghee, Arash
(Georgia Coll. Milledgeville, GA, United States)
Chiu, Jeng-Lun
(California Univ. Berkeley, CA, United States)
Clavel, Maïca
(California Univ. Berkeley, CA, United States)
Corral-Santana, Jesús
(Universidad Catolica de Chile Santiago, Chile)
Hailey, Charles J.
(Columbia Univ. New York, NY, United States)
Krivonos, Roman A.
(Academy of Sciences (Russia) Moscow, Russian Federation)
Mori, Kaya
(Columbia Univ. New York, NY, United States)
Alexander, David M.
(Durham Univ. United Kingdom)
Barret, Didier
(Toulouse Univ. France)
Boggs, Steven E.
(California Univ. Berkeley, CA, United States)
Christensen, Finn E.
(Technical Univ. of Denmark Lyngby, Denmark)
Craig, William W.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Forster, Karl
(California Inst. of Tech. Pasadena, CA, United States)
Giommi, Paolo
(Italian Space Agency Matera, Italy)
Grefenstette, Brian W.
(California Inst. of Tech. Pasadena, CA, United States)
Harrison, Fiona A.
(California Inst. of Tech. Pasadena, CA, United States)
Hornstrup, Allan
(Technical Univ. of Denmark Lyngby, Denmark)
Kitaguchi, Takao
(Hiroshima Univ. Japan)
Koglin, J. E.
(Kavli Inst. for Particle Astrophysics and Cosmology Menlo Park, CA, United States)
Madsen, Kristin K.
(California Inst. of Tech. Pasadena, CA, United States)
Mao, Peter H.
(California Inst. of Tech. Pasadena, CA, United States)
Miyasaka, Hiromasa
(California Inst. of Tech. Pasadena, CA, United States)
Perri, Matteo
(National Inst. for Astrophysics Astronomical Observatory (INAF) Trieste, Italy)
Pivovaroff, Michael J.
(Lawrence Livermore National Lab. Livermore, CA, United States)
Puccetti, Simonetta
(National Inst. for Astrophysics Astronomical Observatory (INAF) Trieste, Italy)
Rana, Vikram
(California Inst. of Tech. Pasadena, CA, United States)
Westergaard, Niels J.
(Technical Univ. of Denmark Lyngby, Denmark)
Zhang, William W.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
July 3, 2017
Publication Date
April 6, 2017
Publication Information
Publication: The Astrophysical Journal Supplement Series
Publisher: The American Astronomical Society
Volume: 229
Issue: 2
ISSN: 0067-0049
e-ISSN: 1538-4365
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN44064
Distribution Limits
Public
Copyright
Other
Keywords
general – Galaxy: disk – novae
cataclysmic variables – X-rays: binaries – X-rays: stars

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