| Type |
Conference Paper |
| Names |
Linda S. Sparke, G. van Moorsel, U. Schwarz, P. Erwin, E. M. H. Wehner, M. Vogelaar |
| Proceedings Title |
Bulletin of the American Astronomical Society |
| Conference Name |
American Astronomical Society, AAS Meeting #211, #13.11 |
| Volume |
39 |
| Pages |
756 |
| Date |
December 1, 2007 |
| Short Title |
NGC 2655 and NGC 3718 |
| URL |
http://adsabs.harvard.edu/abs/2007AAS...211.1311S |
| Library Catalog |
NASA ADS |
| Abstract |
NGC 2655 and NGC 3718 are nearby bright S0/Sa galaxies with strongly
asymmetric central dust lanes and an extended disk of neutral hydrogen
gas. Deep optical images show tidal arms and regions of diffuse
starlight well beyond the main galaxy, suggestive of a recent merger.
Our VLA 21cm maps made show a layer of neutral hydrogen extending to at
least 40kpc from the center. In both systems the pattern of gas
velocities is generally bisymmetric, but the HI layer is strongly
warped; it does not share the kinematics of the stellar disk. The gas
orbits twist by at least 90ο as the HI layer appears to
warp through edge-on. In NGC 3718, we combine a tilted-ring fit to the
HI data cube with dynamical modeling to put constraints on the
flattening of the galaxy's dark halo.
We thank the NSF, NSERC Canada, and the German DFG for grant support. |