Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415..174w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 415, no. 1, p. 174-180.
Astronomy and Astrophysics
Astrophysics
24
Absorption Spectra, Galactic Halos, Heavy Elements, Quasars, Galactic Structure, Intergalactic Media, Line Spectra
Scientific paper
Recent observations indicate that the QSO heavy-element absorption line (HEAL) systems are associated with extremely large galactic halos. The origin of the absorbing gas, however, is not well understood. We demonstrate that an extremely large star formation rate is required if the HEAL gas originates from galactic disks. This is clearly incompatible with the observed moderate evolution and the normal colors of the galaxies associated with the Mg II absorption lines (MgALs). Studies of the H I high-velocity clouds, the Magellanic Stream, and recent observations of nearby QSOs suggest that the gas tidally torn out from the LMC/SMC system may be responsible for the MgALs observed in the Galactic halo. We therefore propose that the absorption lines originate from progressive gas accretion from satellite galaxies (or large gas clumps) as a result of dynamical friction and tidal interaction. We investigate two possible channels through which the gas is ejected from satellites and accretes onto the primary. The first is the direct tidal stripping by the primary's massive halo, in which case the torn-out gas is mostly in the form of clouds. The second is the satellite wind resulting from the heating by supernovae, whose rate may be enhanced by tidal interactions.
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