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18 April 2024 |
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On the X-ray Spectral Energy Distributions of Star-Forming Galaxies: the 0.3-30 keV Spectrum of the Low-Metallicity Starburst Galaxy VV 114 | | Kristen Garofali
; Bret D. Lehmer
; Antara Basu-Zych
; Lacey A. West
; Daniel Wik
; Mihoko Yukita
; Neven Vulic
; Andrew Ptak
; Ann Hornschemeier
; | | Date: |
18 Sep 2020 | | Abstract: | Binary population synthesis combined with cosmological models suggest that
X-ray emission from star-forming galaxies, consisting primarily of emission
from X-ray binaries (XRBs) and the hot interstellar medium (ISM), could be an
important, and perhaps dominant, source of heating of the intergalactic medium
prior to the epoch of reionization. However, such models rely on empirical
constraints for the X-ray spectral energy distributions (SEDs) of star-forming
galaxies, which are currently lacking for low-metallicity galaxies. Using a
combination of Chandra, XMM-Newton, and NuSTAR observations, we present new
constraints on the 0.3-30 keV SED of the low-metallicity starburst galaxy VV
114, which is known to host several ultra-luminous X-ray sources (ULXs) with
luminosities above 10$^{40}$ erg s$^{-1}$. We use an archival Chandra
observation of VV 114 to constrain the contributions to the X-ray SED from the
major X-ray emitting components of the galaxy, and newly acquired, nearly
simultaneous XMM-Newton and NuSTAR observations to extend the spectral model
derived from Chandra to cover the 0.3-30 keV range. Using our best-fit
galaxy-wide spectral model, we derive the 0.3-30 keV SED of VV 114, which we
find is dominated by emission from the XRB population, and in particular ULXs,
at energies > 1.5 keV, and which we find to have an elevated galaxy-integrated
X-ray luminosity per unit star formation rate relative to higher-metallicity
star-forming galaxies. We discuss our results in terms of the effect of
metallicity on XRB populations and the hot ISM, and the importance of X-ray
emission from star-forming galaxies in the high redshift Universe. | | Source: | arXiv, 2009.08985 | | Services: | Forum | Review | PDF | Favorites | |
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