Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724620r&link_type=abstract
American Astronomical Society, AAS Meeting #217, #246.20; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present deep neutral hydrogen observations of the nearby spiral galaxy NGC 1003, obtained as part of the Westerbork Hydrogen Accretion in LOcal GAlaxieS (HALOGAS) Survey currently being performed with the Westerbork Synthesis Radio Telescope (WSRT). Our data are sensitive enough to detect and study both faint diffuse neutral hydrogen gas, as well as discrete accreting gas clouds. We have performed careful tilted-ring modeling of NGC 1003, which shows that it is nearly edge-on, and has a significant warp. The HI disk is both thick (scale height 1 kpc) and radially extended (4-5 times larger than the optical disk). We also present the results of our analysis of the extraplanar gas cloud population in this galaxy. We detect two discrete clouds in the halo of NGC 1003, both with HI masses of about two hundred thousand solar masses, and a larger extraplanar gas complex with an HI mass of about two million solar masses. These extraplanar gas features are analogous to high- and intermediate-velocity clouds around the Milky Way. We discuss the implications of these features for the accretion history of NGC 1003.
Allan John
Heald George
Józsa Gyula
Rand Richard J.
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