The Relics of Structure Formation: Extra-Planar Gas and High-Velocity Clouds Around M31

Details The Relics of Structure Formation: Extra-Planar Gas and High-Velocity Clouds Around M31 The Relics of Structure Formation: Extra-Planar Gas and High-Velocity Clouds Around M31

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21115802w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #158.02

Astronomy and Astrophysics

Astronomy

Scientific paper

We used the 100-m radio telescope at Effelsberg and the Westerbork Synthesis Radio Telescope to systematically study high-velocity clouds (HVCs) and extra-planar gas around the Andromeda Galaxy (M31) down to HI column densities of about 1018 cm-2. We detected several individual clouds within 50 kpc projected distance of M31 with typical diameters of about 1 kpc and HI masses of the order of 105 solar masses. Some of the HVCs are most likely of tidal origin in connection with the giant stellar stream and satellite galaxies of M31. A comparison with different models and observations suggests that the observed parameters of the remaining clouds are in good agreement with those of primordial dark-matter satellites as predicted by CDM structure formation scenarios.

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