Sub-kiloparsec scaling relations between hot gas, dense gas and star formation rate in five nearby star-forming galaxies
arxiv(2024)
摘要
Based on the newly acquired dense gas observations from the JCMT MALATANG
survey and X-ray data from Chandra, we explore the correlation between hot gas
and HCN J=4 → 3, HCO^+ J=4 → 3 emission for the first
time at sub-kiloparsec scale of five nearby star-forming galaxies, namely M82,
M83, IC 342, NGC 253, and NGC 6946. We find that both HCN J=4 → 3
and HCO^+ J=4 → 3 line luminosity show a statistically significant
correlation with the 0.5-2 keV X-ray emission of the diffuse hot gas
(L_ 0.5 - 2 keV^ gas). The Bayesian regression analysis gives the
best fit of log(L_ 0.5-2 keV^ gas /
erg s^-1)=2.39 log(L'_ HCN(4-3) /
K km s^-1 pc^2)+24.83 and log(L_ 0.5-2 keV^ gas
/ erg s^-1)=2.48 log(L'_ HCO^+(4-3) /
K km s^-1 pc^2)+23.84, with dispersion of 0.69 dex and 0.54
dex, respectively. At the sub-kiloparsec scale, we find that the power-law
index of the L_ 0.5 - 2 keV^ gas - star formation rate (SFR)
relation is log(L_ 0.5-2 keV^ gas /
erg s^-1)=1.80 log ( SFR /M_⊙ yr^-1)+39.16,
deviated from previous linear relations at global scale. This implies that the
global property of hot gas significantly differs from individual resolved
regions, which is influenced by the local physical conditions close to the
sites of star formation.
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