Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-04-22
Astrophys.J.699:76-88,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
29 pages, 11 figures, accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/699/1/76
We present deep HI observations of the moderately inclined spiral galaxy, NGC 2997. The goal of these observations was to search for HI clouds in the vicinity of NGC 2997 analogous to the high velocity clouds of the Milky Way and gain insight into their origins. We find evidence for the presence of a galactic fountain as well as the accretion of intragalactic material, however we do not identify any large clouds of HI far from the disk of the galaxy. NGC 2997 has a thick, lagging HI disk that is modeled with a vertical velocity gradient of 18-31 km/s/kpc. Anomalous velocity HI clouds with masses of order 10^7 Msun, which cannot be explained by galactic fountain models allow us to estimate a lower limit to the accretion of extragalactic gas of 1.2 Msun/yr. The number and mass of these clouds have implications for cosmological simulations of large scale structure and the presence of dark matter halos. We have used values from the the literature to estimate a star formation rate of 5 +/- 1 Msun/yr and to derive a new distance to NGC 2997 of 12.2 +/- 0.9 Mpc using published Tully-Fisher relations.
Chengular Jayaram N.
Hess Kelley M.
Pisano Daniel J.
Wilcots Eric M.
No associations
LandOfFree
Anomalous HI in NGC 2997 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Anomalous HI in NGC 2997, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anomalous HI in NGC 2997 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-275325