The Mass and Absorption Columns of Galactic Gaseous Halos
作者： Zhijie Qu , Joel N. Bregman
关键词: Star formation 、 Radiative cooling 、 Metallicity 、 Interstellar medium 、 Photoionization 、 Astrophysics 、 Ionization 、 Physics 、 Galaxy 、 Halo
摘要: The galactic gaseous halo is a gas reservoir for the interstellar medium in galaxy disk, supplying materials star formation. We developed model connecting disk and by assuming formation rate on balanced radiative cooling of halo, including stellar feedback. In addition to single-temperature collisional ionization equilibrium, we also consider photoionization effect steady-state model. Photoionization important modifying ion distribution low-mass galaxies outskirts massive due low densities. multi-phase dominates region within radius, where t_cooling=t_Hubble. Our reproduces most observed high state ions wide range masses (i.e., OVI, OVII, NeVIII, MgX, OVIII). find that OVI column density has narrow around ~10^14 cm^-2 from M_star ~ 3 * 10^10 Msun 6*10^12 Msun, which consistent with some but not all observational studies. For <~ 10^11 produces while more galaxies, higher temperatures. Fitting Galactic (Milky-Way) OVII OVIII suggests metallicity ~0.55 Zsun maximum temperature 1.9 10^6 K. This does close census baryonic material R200.
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