Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 764, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/764/2/L21
Keywords
galaxies: evolution; galaxies: ISM; galaxies: star formation; Galaxy: halo; ISM: clouds
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Funding
- PRIN-MIUR [2008SPTACC]
- The Miky Way system of the DFG [SFB 881]
- Science and Technology Facilities Council [PP/D001242/1, ST/K00106X/1, ST/J00149X/1, ST/G002479/1] Funding Source: researchfish
- STFC [PP/D001242/1, ST/J00149X/1, ST/K00106X/1, ST/G002479/1] Funding Source: UKRI
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We show that the ultraviolet absorption features, newly discovered in Hubble Space Telescope 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 M-circle dot yr(-1). We speculate that this mechanism explains how the hot mode of cosmological accretion feeds star formation in galactic disks.
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