%0 Generic %1 fraternali2013ionized %A Fraternali, Filippo %A Marasco, Antonino %A Marinacci, Federico %A Binney, James %D 2013 %K accretion fountain galaxy hot mode %T Ionized absorbers as evidence for supernova-driven cooling of the lower Galactic corona %U http://arxiv.org/abs/1301.4998 %X We show that the ultraviolet absorption features, newly discovered in HST spectra, are consistent with being formed in a layer that extends a few kpc above the disk of the Milky Way. In this interface between the disk and the Galactic corona, high-metallicity gas ejected from the disk by supernova feedback can mix efficiently with the virial-temperature coronal material. The mixing process triggers the cooling of the lower corona down to temperatures encompassing the characteristic range of the observed absorption features, producing a net supernova-driven gas accretion onto the disk at a rate of a few Msun/yr. We speculate that this mechanism explains how the hot-mode of cosmological accretion feeds star formation in galactic disks.

@misc{fraternali2013ionized, abstract = {We show that the ultraviolet absorption features, newly discovered in HST spectra, are consistent with being formed in a layer that extends a few kpc above the disk of the Milky Way. In this interface between the disk and the Galactic corona, high-metallicity gas ejected from the disk by supernova feedback can mix efficiently with the virial-temperature coronal material. The mixing process triggers the cooling of the lower corona down to temperatures encompassing the characteristic range of the observed absorption features, producing a net supernova-driven gas accretion onto the disk at a rate of a few Msun/yr. We speculate that this mechanism explains how the hot-mode of cosmological accretion feeds star formation in galactic disks.}, added-at = {2013-01-23T17:06:45.000+0100}, author = {Fraternali, Filippo and Marasco, Antonino and Marinacci, Federico and Binney, James}, biburl = {https://www.bibsonomy.org/bibtex/2a6f65aaf9acca7f1e9177318746bcfa9/miki}, description = {[1301.4998] Ionized absorbers as evidence for supernova-driven cooling of the lower Galactic corona}, interhash = {24df9fcb67af006730431230f5ed4615}, intrahash = {a6f65aaf9acca7f1e9177318746bcfa9}, keywords = {accretion fountain galaxy hot mode}, note = {cite arxiv:1301.4998Comment: 15 pages, 4 figures, accepted for publication in ApJ Letters}, timestamp = {2013-01-23T17:06:45.000+0100}, title = {Ionized absorbers as evidence for supernova-driven cooling of the lower Galactic corona}, url = {http://arxiv.org/abs/1301.4998}, year = 2013 }