%0 Generic %1 liang2015column %A Liang, Cameron J. %A Kravtsov, Andrey V. %A Agertz, Oscar %D 2015 %K cgm gas halo metallicity profile %T Column Density Profiles of Multi-Phase Gaseous Halos %U http://arxiv.org/abs/1507.07002 %X We present a suite of high-resolution cosmological galaxy re-simulations of a Milky-Way size halo with variety of star-formation and feedback models to investigate the effects of the specific details of the star formation-feedback loop modeling on the observable properties of the circumgalactic medium (CGM). We show that properties of the CGM are quite sensitive to the details of star formation-feedback loop. The simulation which produces a very realistic late-type central galaxy fails to reproduce existing observations of CGM. At the same time, variations of parameters of star formation recipe or feedback modeling, such as cosmic rays feedback, brings predicted CGM in better agreement with observations. The simulations show that the column density profiles of ions arising in such gas are well described by an exponential function of the impact parameter. Ions with higher ionization energy have more extended profiles with the scale height of the exponential distribution scaling as a power law of the ionization energy: hs~Eion^0.72. At z~0, the scale height of warm gas traced by low-ionization species, such as MgII and CIV, have scale heights of 0.2-0.4Rvir, while higher ionization species, such as OVI and NeVIII, have scale heights of 1.6-2.4Rvir. The predicted trend is in good qualitative and reasonable quantitative agreement with observations for ions, such as CIV and OVI. Simulations do produce a sharp turnover in the column density profiles and covering fraction distribution for different ions seen in observations. This turnover however does not correspond to a "boundary" of an ion, but reflects the underlying steep exponential column density profile. We also find that the scale height evolves slower than the virial radius at z<2, but similarly to the halo scale radius, rs. Thus, column density profiles of galaxies at different redshifts can be rescaled using rs of their halos.

@misc{liang2015column, abstract = {We present a suite of high-resolution cosmological galaxy re-simulations of a Milky-Way size halo with variety of star-formation and feedback models to investigate the effects of the specific details of the star formation-feedback loop modeling on the observable properties of the circumgalactic medium (CGM). We show that properties of the CGM are quite sensitive to the details of star formation-feedback loop. The simulation which produces a very realistic late-type central galaxy fails to reproduce existing observations of CGM. At the same time, variations of parameters of star formation recipe or feedback modeling, such as cosmic rays feedback, brings predicted CGM in better agreement with observations. The simulations show that the column density profiles of ions arising in such gas are well described by an exponential function of the impact parameter. Ions with higher ionization energy have more extended profiles with the scale height of the exponential distribution scaling as a power law of the ionization energy: hs~Eion^0.72. At z~0, the scale height of warm gas traced by low-ionization species, such as MgII and CIV, have scale heights of 0.2-0.4Rvir, while higher ionization species, such as OVI and NeVIII, have scale heights of 1.6-2.4Rvir. The predicted trend is in good qualitative and reasonable quantitative agreement with observations for ions, such as CIV and OVI. Simulations do produce a sharp turnover in the column density profiles and covering fraction distribution for different ions seen in observations. This turnover however does not correspond to a "boundary" of an ion, but reflects the underlying steep exponential column density profile. We also find that the scale height evolves slower than the virial radius at z<2, but similarly to the halo scale radius, rs. Thus, column density profiles of galaxies at different redshifts can be rescaled using rs of their halos.}, added-at = {2015-07-28T09:55:37.000+0200}, author = {Liang, Cameron J. and Kravtsov, Andrey V. and Agertz, Oscar}, biburl = {https://www.bibsonomy.org/bibtex/2b071ed9cf9f56dff964746823a8ca9f4/miki}, description = {[1507.07002] Column Density Profiles of Multi-Phase Gaseous Halos}, interhash = {c40eac9a71753d36caaff724504a7024}, intrahash = {b071ed9cf9f56dff964746823a8ca9f4}, keywords = {cgm gas halo metallicity profile}, note = {cite arxiv:1507.07002Comment: 26 pages, 17 figures, submitted to MNRAS}, timestamp = {2015-07-28T09:55:37.000+0200}, title = {Column Density Profiles of Multi-Phase Gaseous Halos}, url = {http://arxiv.org/abs/1507.07002}, year = 2015 }