%0 Generic %1 kacprzak2013smooth %A Kacprzak, Glenn G. %A Cooke, Jeff %A Churchill, Christopher W. %A Ryan-Weber, Emma V. %A Nielsen, Nikole M. %D 2013 %K gas halo ism mgii %T The Smooth MgII gas distribution through the interstellar/extra-planar/halo interface %U http://arxiv.org/abs/1310.1918 %X We report the first measurements of MgII absorption systems associated with spectroscopically confirmed z~0.1 star-forming galaxies at projected distances of D<6kpc. We demonstrate the data are consistent with the well known anti-correlation between rest-frame MgII equivalent width, Wr(2796), and impact parameter, D, represented by a single log-linear relation derived by Nielsen et al. (MAGIICAT) that converges to ~2A at D=0kpc. Incorporating MAGIICAT, we find that the halo gas covering fraction is unity below D~25kpc. We also report that our D<6kpc absorbers are consistent with the Wr(2796) distributions of the Milky Way interstellar medium (ISM) and ISM+halo. In addition, quasar sight-lines of intermediate redshift galaxies with 6<D<25kpc have an equivalent width distribution similar to that of the Milky Way halo, implying that beyond ~6kpc, quasar sight-lines are likely probing halo gas and not the ISM. As inferred by the Milky Way and our new data, the gas profiles of galaxies can be fit by a single log-linear Wr(2796)-D relation out to large scales across a variety of gas-phase conditions and is maintained through the halo/extra-planar/ISM interfaces, which is remarkable considering their kinematic complexity. These low redshift, small impact parameter absorption systems are the first steps to bridge the gap between quasar absorption-line studies and HI observations of the CGM.

@misc{kacprzak2013smooth, abstract = {We report the first measurements of MgII absorption systems associated with spectroscopically confirmed z~0.1 star-forming galaxies at projected distances of D<6kpc. We demonstrate the data are consistent with the well known anti-correlation between rest-frame MgII equivalent width, Wr(2796), and impact parameter, D, represented by a single log-linear relation derived by Nielsen et al. (MAGIICAT) that converges to ~2A at D=0kpc. Incorporating MAGIICAT, we find that the halo gas covering fraction is unity below D~25kpc. We also report that our D<6kpc absorbers are consistent with the Wr(2796) distributions of the Milky Way interstellar medium (ISM) and ISM+halo. In addition, quasar sight-lines of intermediate redshift galaxies with 6<D<25kpc have an equivalent width distribution similar to that of the Milky Way halo, implying that beyond ~6kpc, quasar sight-lines are likely probing halo gas and not the ISM. As inferred by the Milky Way and our new data, the gas profiles of galaxies can be fit by a single log-linear Wr(2796)-D relation out to large scales across a variety of gas-phase conditions and is maintained through the halo/extra-planar/ISM interfaces, which is remarkable considering their kinematic complexity. These low redshift, small impact parameter absorption systems are the first steps to bridge the gap between quasar absorption-line studies and HI observations of the CGM.}, added-at = {2013-10-09T17:10:46.000+0200}, author = {Kacprzak, Glenn G. and Cooke, Jeff and Churchill, Christopher W. and Ryan-Weber, Emma V. and Nielsen, Nikole M.}, biburl = {https://www.bibsonomy.org/bibtex/2e1ca073f269a64902d8a7c7e2fb81b96/miki}, description = {[1310.1918] The Smooth MgII gas distribution through the interstellar/extra-planar/halo interface}, interhash = {403a23392d724f11d33333f52f4950cb}, intrahash = {e1ca073f269a64902d8a7c7e2fb81b96}, keywords = {gas halo ism mgii}, note = {cite arxiv:1310.1918Comment: 6 pages, 3 figures, accepted 26/09/2013 for publication in ApJL}, timestamp = {2013-10-09T17:10:46.000+0200}, title = {The Smooth MgII gas distribution through the interstellar/extra-planar/halo interface}, url = {http://arxiv.org/abs/1310.1918}, year = 2013 }