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http://hdl.handle.net/2289/6419
Title: | Diffuse x-ray emission from star-forming galaxies |
Authors: | Sarkar, Kartick Chandra Nath, Biman B. Sharma, Prateek Shchekinov, Yuri |
Issue Date: | 20-Feb-2016 |
Publisher: | IOP Publishing Ltd for the American Astronomical Society |
Citation: | Astrophysical Journal Letters, 2016, Vol. 818, pL24 |
Abstract: | We study the diffuse X-ray luminosity (LX) of star-forming galaxies using two-dimensional axisymmetric hydrodynamical simulations and analytical considerations of supernovae-(SNe-)driven galactic outflows. We find that the mass loading of the outflows, a crucial parameter for determining the X-ray luminosity, is constrained by the availability of gas in the central star-forming region, and a competition between cooling and expansion. We show that the allowed range of the mass loading factor can explain the observed scaling of LX with star formation rate (SFR) as ${L}_{{\rm{X}}}\quad \propto $ SFR2 for SFR $\gtrsim \quad 1$ ${M}_{\odot }$ yr−1, and a flatter relation at low SFRs. We also show that the emission from the hot circumgalactic medium (CGM) in the halo of massive galaxies can explain the large scatter in the ${L}_{{\rm{X}}}\mbox{--}\mathrm{SFR}$ relation for low SFRs (lesssimfew ${M}_{\odot }$ yr−1). Our results suggest that galaxies with small SFRs and large diffuse X-ray luminosities are excellent candidates for the detection of the elusive CGM. |
Description: | Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations) |
URI: | http://hdl.handle.net/2289/6419 |
ISSN: | 2041-8205 2041-8213 (Online) |
Alternative Location: | http://adsabs.harvard.edu/abs/2016ApJ...818L..24S http://arxiv.org/abs/1601.00394 http://dx.doi.org/10.3847/2041-8205/818/2/L24 |
Copyright: | 2016 American Astronomical Society |
Appears in Collections: | Research Papers (A&A) |
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2016_AstruPhyJLet_818_L24.pdf Restricted Access | Restricted Access | 568.81 kB | Adobe PDF | View/Open Request a copy |
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