Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7730t&link_type=abstract
HST Proposal ID #7730
Other
Hst Proposal Id #7730 Galaxies &Amp, Clusters
Scientific paper
We propose to probe the dark matter distribution of M31 far from the center by observing intervening absorption from the MgII doublet {lambda 2800} in the spectrum of one background QSO located in a geometrically optimal position. HST observations are required because this feature is in a wavelength range not accessible from the ground, and the QSO magnitudes and expected strength of absorption make IUE observations unfeasible. Other ground-accessible features, notably CaII, are expected to be too weak for detection. With these observations, we will extend the rotation curve of M31 to about 6 Holmberg radii, a factor of 4 farther than the HI rotation curve obtained for M31 itself and 2.5 times farther than has been obtained from the ground for any bright galaxy. This observation will open a new territory in the study of the dark matter distribution for galaxies, and specifically address the question of where the dark matter halo around individual galaxies stops: whether it ends just beyond the range of deep HI observations or it continues a factor of several further out. In the latter case, halos of individual galaxies may be responsible for a larger fraction of the dark matter found on larger scales than otherwise believed.
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