Francesca M. Fornasini
The NuSTAR Hard X-Ray Survey of the Norma Arm Region
Fornasini, Francesca M.; Tomsick, John A.; Hong, JaeSub; Gotthelf, Eric V.; Bauer, Franz; Rahoui, Farid; Stern, Daniel; Bodaghee, Arash; Chiu, Jeng-Lun; Clavel, Maïca; Corral-Santana, Jesús; Hailey, Charles J.; Krivonos, Roman A.; Mori, Kaya; Alexander, David M.; Barret, Didier; Boggs, Steven E.; Christensen, Finn E.; Craig, William W.; Forster, Karl; Giommi, Paolo; Grefenstette, Brian W.; Harrison, Fiona A.; Hornstrup, Allan; Kitaguchi, Takao; Koglin, J.E.; Madsen, Kristin K.; Mao, Peter H.; Miyasaka, Hiromasa; Perri, Matteo; Pivovaroff, Michael J.; Puccetti, Simonetta; Rana, Vikram; Westergaard, Niels J.; Zhang, William W.
Authors
John A. Tomsick
JaeSub Hong
Eric V. Gotthelf
Franz Bauer
Farid Rahoui
Daniel Stern
Arash Bodaghee
Jeng-Lun Chiu
Maïca Clavel
Jesús Corral-Santana
Charles J. Hailey
Roman A. Krivonos
Kaya Mori
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
Didier Barret
Steven E. Boggs
Finn E. Christensen
William W. Craig
Karl Forster
Paolo Giommi
Brian W. Grefenstette
Fiona A. Harrison
Allan Hornstrup
Takao Kitaguchi
J.E. Koglin
Kristin K. Madsen
Peter H. Mao
Hiromasa Miyasaka
Matteo Perri
Michael J. Pivovaroff
Simonetta Puccetti
Vikram Rana
Niels J. Westergaard
William W. Zhang
Abstract
We 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 × 10−14 and 4 × 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 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 ≈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 10–20 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.
Citation
Fornasini, F. M., Tomsick, J. A., Hong, J., Gotthelf, E. V., Bauer, F., Rahoui, F., …Zhang, W. W. (2017). The NuSTAR Hard X-Ray Survey of the Norma Arm Region. Astrophysical Journal Supplement, 229(2), Article 33. https://doi.org/10.3847/1538-4365/aa61fc
Journal Article Type | Article |
---|---|
Acceptance Date | Feb 19, 2017 |
Online Publication Date | Apr 6, 2017 |
Publication Date | Apr 6, 2017 |
Deposit Date | Jun 21, 2017 |
Publicly Available Date | Jul 3, 2017 |
Journal | Astrophysical Journal Supplement |
Print ISSN | 0067-0049 |
Electronic ISSN | 1538-4365 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 229 |
Issue | 2 |
Article Number | 33 |
DOI | https://doi.org/10.3847/1538-4365/aa61fc |
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Copyright Statement
© 2017. The American Astronomical Society. All rights reserved.
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