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.
Description
[1301.4998] Ionized absorbers as evidence for supernova-driven cooling of the lower Galactic corona
%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
}