NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T07:22:57 PDT
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For refcode 2013MNRAS.435.3071L:
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Copyright by Royal Astronomical Society. 2013MNRAS.435.3071L Chandra survey of nearby highly inclined disc galaxies - II. Correlation analysis of galactic coronal properties Li, Jiang-Tao; Wang, Q. Daniel Abstract. X-ray observations provide a key tool for exploring the properties of galactic coronae and their formation processes. In an earlier paper, we have presented a Chandra data analysis of the coronae of 53 nearby highly inclined disc galaxies. Here we study the correlation of the X-ray measurements of the coronae with other galaxy properties and compare the results with those obtained for elliptical galaxies. A good correlation is present between the coronal luminosity (L_X_) and the star formation rate (SFR). But we find a better correlation between L_X_ and the total supernova (SN) mechanical energy input rate (E_SN_), including the expected contribution from both core collapsed (CC) and Type Ia SNe. The X-ray radiation efficiency (eta = L_X_/E_SN_) of the coronae has a mean value of ~0.4 per cent with an rms of 0.50 +/- 0.06 dex. eta further correlates with M_TF_/M_*_ (M_TF_ is the total baryon mass measured from the rotation velocity and the Tully-Fisher relation, and M_*_ is the stellar mass measured from the K-band luminosity) and the CC SN rate surface density [F_SN(CC)_, in units of SN yr^-1^ kpc^-2^], which can be characterized as eta =(0.41_-0.12_^+0.13^ per cent) M_TF_/M_*_ and eta =(1.4 +/- 0.5 per cent)F_SN(CC)_^-(0.29 +/- 0.11)^. These correlations reflect the roles played by the gravitational mass and energetic feedback concentrations of the galaxies in determining their X-ray radiation efficiency. The characteristic temperature (T_X_) of the coronal gas shows little dependence on the total or specific SFR, the cold gas content or L_X_. The coronae of disc galaxies tend to be more X-ray luminous, hotter and lower in the Fe/O abundance ratio than those of elliptical ones of similar masses. Early-type non-starburst disc galaxies tend to be more Fe-rich, while starburst ones have a roughly constant abundance ratio of Fe/O ~ 0.36 +/- 0.12 solar. Our results are consistent with the coronal gas being mainly provided by stellar feedback in a galaxy stellar mass range of ~10^8.7-11^ M_sun_. In addition, processes such as charge exchange at cool/hot gas interfaces, as well as various other environmental effects, are also needed to explain the diversity of the observed coronal X-ray properties. Key words: galaxies: general, galaxies: haloes, intergalactic medium, galaxies: spiral, galaxies: statistics, X-rays: galaxies
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