Other
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4918h&link_type=abstract
American Astronomical Society Meeting 208, #49.18; Bulletin of the American Astronomical Society, Vol. 38, p.127
Other
Scientific paper
We present the preliminary results of deep ATCA HI observations of the 50 kpc radius around a single, relatively isolated galaxy, NGC 2997, to search for HI clouds analogous to the High Velocity Clouds (HVCs) seen around the Milky Way. Recently, Thilker et al. (2004) and Braun & Thilker (2004) reported the detection of 95 such HI clouds around M31. This population is distributed within 50-100 kpc of M31 and has MHI=0.4-30*106 M&sun;. These authors claim that over 80% of these HVCs are part of the "compact HVC" (CHVC) class which Braun & Burton (1999) propose are associated with low-mass dark matter halos predicted to exist in large numbers by cold dark matter models of galaxy formation around the Milky Way. While there have been other detections of HVCs associated with other galaxies, they may all be associated with either galactic fountains (e.g. NGC 6946, Boomsma et al. 2004; NGC 253, Boomsma et al. 2005), tidal features (e.g. M51 & M83, Miller & Bregman 2003), or both. However, the question of interpretation is open. The M31 HVCs may be tidal debris from past accretion events or interactions with its neighbors; they may be foreground emission associated with the Magellanic Stream (which passes nearby); or they may be located elsewhere within the halo of the Milky Way or Local Group. A search for analogs around NGC 2997, which is not confused with local gas, lacks galactic outflows, and has not undergone major tidal interactions will test the hypothesis that the HVC-analogs are associated with galaxy formation. The unambiguous detection of such a population of low mass HI clouds around another galaxy would be an important confirmation of one of the key predictions of CDM models of galaxy formation.
Hess Kelley M.
Pisano Daniel J.
Wilcots Eric
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