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Launching of hot gas outflow by disc-wide supernova explosions | | Evgenii O. Vasiliev
; Yuri A. Shchekinov
; Biman B. Nath
; | | Date: |
3 Jan 2019 | | Abstract: | Galactic gas outflows are driven by stellar feedback with dominant
contribution from supernovae (SN) explosions. The question of whether the
energy deposited by SNe initiates a large scale outflow or gas circulation on
smaller scales -- between discs and intermediate haloes, depends on SN rate and
their distribution in space and time. We consider here gas circulation by
disc-wide unclustered SNe with galactic star formation rate in the range from
{$simeq 6 imes 10^{-4}$ to $simeq 6 imes
10^{-2}~M_odot$~yr$^{-1}$~kpc$^{-2}$, corresponding to mid-to-high star
formation observed in galaxies. We show that such disc-wide SN explosion regime
can form circulation of warm ($Tsim 10^4$ K) and cold ($T<10^3$ K) phases
within a few gas scale heights, and elevation of hot {($T>10^5$ K)} gas at
higher ($z>1$ kpc) heights. We found that the threshold energy input rate for
hot gas outflows with disc-wide supernovae explosions is estimated to be of the
order $sim 4 imes 10^{-4}$~erg~s$^{-1}$~cm$^{-2}$. We discuss the
observational manifestations of such phenomena in optical and X-ray bands. In
particular, we found that for face-on galaxies with SF ($Sigma_{_{
m
SF}}>0.02~M_odot$~yr$^{-1}$~kpc$^{-2}$), the line profiles of ions typical for
warm gas show a double-peak shape, corresponding to out-of-plane outflows. In
the X-ray bands, galaxies with high SF rates ($Sigma_{_{
m
SF}}>0.006~M_odot$~yr$^{-1}$~kpc$^{-2}$) can be bright, with a smooth surface
brightness in low-energy bands ($0.1hbox{--}0.3$~keV) and patchy at higher
energies ($1.6hbox{--}8.3$~keV).} | | Source: | arXiv, 1901.0821 | | Services: | Forum | Review | PDF | Favorites | |
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