Column density profiles of multiphase gaseous haloes

作者: Cameron J. Liang , Andrey V. Kravtsov , Oscar Agertz

DOI: 10.1093/MNRAS/STW375

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摘要: We analyze circumgalactic medium (CGM) in a suite of high-resolution cosmological re-simulations Milky-Way size galaxy and show that CGM properties are quite sensitive to details star formation--feedback loop modelling. The simulation produces realistic late-type galaxy, fails reproduce existing observations the CGM. In contrast, does not produce has predicted better agreement with observations. This illustrates galaxies their provide strong ${\it complementary}$ constraints on processes governing formation. Our simulations predict column density profiles ions well described by an exponential function projected distance $d$: $N \propto e^{-d/h_s}$. Simulations thus indicate sharp drop absorber detections at larger distances correspond "boundary" ion, but reflects underlying steep profile. Furthermore, we find ionization energy is tightly correlated scale height $h_s$: $h_s E_{\rm ion}^{0.74}$. At $z \approx 0$, warm gas traced low-ionization species (e.g., Mg II C IV) $ h_s 0.03-0.07 R_{\rm vir}$, while higher (O VI Ne VIII) have 0.32-0.45R_{\rm vir}$. Finally, heights our evolve slower than virial radius for $z\leq 2$, similarly halo radius, $r_s$. Thus, suggest different redshifts should be scaled $r_s$ rather radius.

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