Mapping Metal-Enriched High Velocity Clouds to Very Low HI Column Densities

Details Mapping Metal-Enriched High Velocity Clouds to Very Low HI Column Densities Mapping Metal-Enriched High Velocity Clouds to Very Low HI Column Densities

2001-08-13

arxiv.org/abs/astro-ph/0108216v2

Astronomy and Astrophysics

Astrophysics

To appear in "Extragalactic Gas at Low Redshift", ASP Proceedings, TBD, ed. J. Muchaey (v2 corrects several typographical erro

Scientific paper

Our galaxy is the nearest known quasar absorption line system, and it uniquely provides us with an opportunity to probe multiple lines of sight through the same galaxy. This is essential for our interpretations of the complex kinematic profiles seen in the MgII absorption due to lines of sight through intermediate redshift galaxies. The Milky Way halo has never been probed for high velocity clouds below the 21-cm detection threshold of N(HI)~10^18 cm-2. Through a survey of MgII absorption looking toward the brightest AGNs and quasars, it will be possible to reach down a few orders of magnitude in HI column density. The analogs to the high velocity components of the MgII absorption profiles due to intermediate redshift galaxies should be seen. We describe a program we are undertaking, and present some preliminary findings.

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