Probing the Outer Regions of M31 with QSO Absorption Lines

Details Probing the Outer Regions of M31 with QSO Absorption Lines Probing the Outer Regions of M31 with QSO Absorption Lines

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10278t&link_type=abstract

HST Proposal ID #10278

Physics

Hst Proposal Id #10278 Quasar Absorption Lines/Igm

Scientific paper

We propose HST-STIS-UV spectroscopy of 10 recently-discovered quasars behind M31. Absorption lines due to MgII and FeII will be searched for and measured. Six quasars lie between 1 and 4.2 Holmberg radii near the major axis on the southwest side, where confusion with Milky Way gas is minimized. Two lie even farther out on the southwest side of the major axis. One lies within 1 Holmberg radius. Two of the 10 pass through M31's high velocity clouds recently seen in a detailed 21 cm emission map. Thus, using the most well-studied external spiral galaxy in the sky, our observations will permit us to check, better than ever before, the standard picture that quasar metal-line absorption systems arise in an extended gaseous halo/disk of a galaxy well beyond its observable optical radius. Notably, the observations have the potential of extending M31's rotation curve to very large galactocentric distances, thereby placing new constraints on M31's dark matter halo.

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