%0 Generic %1 gutcke2016nihao %A Gutcke, Thales A. %A Stinson, Greg S. %A Macciò, Andrea V. %A Wang, Liang %A Dutton, Aaron A. %D 2016 %K cgm low-z ovi simulation %T NIHAO VIII: Circum-galactic medium and outflows - The puzzles of HI and OVI gas distributions %U http://arxiv.org/abs/1602.06956 %X We study the hot and cold circum-galactic medium (CGM) of galaxies of the cosmological, hydrodynamical simulation suite NIHAO. NIHAO allows a study of how the z = 0 CGM varies across 5 orders of magnitude of stellar mass using OVI and HI as proxies for hot and cold gas. The cool Hi covering fraction and column density profiles match observations well, particularly in the inner CGM. OVI shows increasing column densities with mass, a trend seemingly echoed in the observations. As in multiple previous simulations, the OVI column densities in simulations are lower than observed and optically thick HI does not extend as far out as in observations. We make observable predictions of the bipolarity of outflows and their effect on the general shape of the CGM. Bipolar outflows can be seen out to around 40 kpc, but outside that radius, the CGM is too well mixed to detect an elongated shape. The simulated CGM is remarkably spherical even in low mass simulations. The chemical enrichment of both halo and disc gas follow expected increasing trends as a function of halo mass that are well fit with power laws. These relations can be used in non-hydrodynamic models, such as semi-analytic models.

@misc{gutcke2016nihao, abstract = {We study the hot and cold circum-galactic medium (CGM) of galaxies of the cosmological, hydrodynamical simulation suite NIHAO. NIHAO allows a study of how the z = 0 CGM varies across 5 orders of magnitude of stellar mass using OVI and HI as proxies for hot and cold gas. The cool Hi covering fraction and column density profiles match observations well, particularly in the inner CGM. OVI shows increasing column densities with mass, a trend seemingly echoed in the observations. As in multiple previous simulations, the OVI column densities in simulations are lower than observed and optically thick HI does not extend as far out as in observations. We make observable predictions of the bipolarity of outflows and their effect on the general shape of the CGM. Bipolar outflows can be seen out to around 40 kpc, but outside that radius, the CGM is too well mixed to detect an elongated shape. The simulated CGM is remarkably spherical even in low mass simulations. The chemical enrichment of both halo and disc gas follow expected increasing trends as a function of halo mass that are well fit with power laws. These relations can be used in non-hydrodynamic models, such as semi-analytic models.}, added-at = {2016-02-24T09:49:42.000+0100}, author = {Gutcke, Thales A. and Stinson, Greg S. and Macciò, Andrea V. and Wang, Liang and Dutton, Aaron A.}, biburl = {https://www.bibsonomy.org/bibtex/237b861c93bf267590c5e30a586035806/miki}, description = {[1602.06956] NIHAO VIII: Circum-galactic medium and outflows - The puzzles of HI and OVI gas distributions}, interhash = {da3f73d651a416c05e21a150a4302afe}, intrahash = {37b861c93bf267590c5e30a586035806}, keywords = {cgm low-z ovi simulation}, note = {cite arxiv:1602.06956Comment: 20 pages, 16 figures, submitted to MNRAS}, timestamp = {2016-02-24T09:49:42.000+0100}, title = {NIHAO VIII: Circum-galactic medium and outflows - The puzzles of HI and OVI gas distributions}, url = {http://arxiv.org/abs/1602.06956}, year = 2016 }