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The NuSTAR Hard X-ray Survey of the Norma Arm Region | | Francesca M. Fornasini
; John A. Tomsick
; JaeSub Hong
; Eric V. Gotthelf
; Franz Bauer
; Farid Rahoui
; Daniel Stern
; Arash Bodaghee
; Jeng-Lun Chiu
; Maïca Clavel
; Jesús M. Corral-Santana
; Charles J. Hailey
; Roman A. Krivonos
; Kaya Mori
; David M. Alexander
; 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
; | | Date: |
28 Feb 2017 | | Abstract: | 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
$5 imes10^{-14}$ and $4 imes10^{-14}$ 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 $approx$10-20 keV, consistent with the Galactic
Ridge X-ray emission spectrum but lower than temperatures of CVs near the
Galactic Center. This temperature difference may indicate that the Norma region
has a lower fraction of intermediate polars relative to other types of CVs
compared to the Galactic Center. The NuSTAR log$N$-log$S$ 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
$kTapprox15$~keV, as observed for the CV candidates. | | Source: | arXiv, 1703.0021 | | Services: | Forum | Review | PDF | Favorites | |
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