The Galactic Bulge Diffuse Emission in Broadband X-Rays with NuSTAR
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Perez_2019_ApJ_884_153.pdf
Description
Published version
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971.54 KB
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Adobe PDF
Checksum (MD5)
5ae905db5ed30484c37b1998532d1332
Author(s)
Perez, Kerstin M.
Krivonos, Roman
Wik, Daniel R
Date Issued
October 2019
Journal
Astrophysical Journal
Publisher
American Astronomical Society
Citation
Perez, Kerstin et al., "The Galactic Bulge Diffuse Emission in Broadband X-Rays with NuSTAR." Astrophysical Journal 884, 2 (October 2019): 153 doi. 10.3847/1538-4357/ab4590 ©2019 Authors
Version
Final published version
Abstract
The diffuse hard X-ray emission that fills the Galactic center, bulge, and ridge is believed to arise from unresolved populations of X-ray binary systems. However, the identity of the dominant class of accreting objects in each region remains unclear. Recent studies of Fe line properties and the low-energy (<10 keV) X-ray continuum of the bulge indicate a major population fraction of nonmagnetic cataclysmic variables (CVs), in particular quiescent dwarf novae (DNe). This is in contrast to previous high-energy (>10 keV) X-ray measurements of the bulge and ridge, which indicate a dominant population of magnetic CVs, in particular intermediate polars. In addition, NuSTAR broadband measurements have uncovered a much heavier intermediate polar population in the central ∼100 pc than previously assumed, raising the possibility that some fraction of this population extends further from the center. Here we use NuSTAR's large aperture for unfocused photons and its broadband X-ray range to probe the diffuse continuum of the inner ∼1°-3° of the Galactic bulge. This allows us to constrain possible multitemperature components of the spectrum, such as could indicate a mixture of soft and hard populations. Our emissivity is consistent with previous hard X-ray measurements in the bulge and ridge, with the diffuse X-ray luminosity tracing the stellar mass. The spectrum is well described by a singleerature thermal plasma with kT ≈ 8 keV, with no significant emission above 20 keV. This supports that the bulge is dominated by quiescent DNe; we find no evidence of a significant intermediate polar population in the hard X-ray band. ©2019. The American Astronomical Society. All rights reserved..
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.3847/1538-4357/AB4590
