Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30603t&link_type=abstract
Spitzer Proposal ID #30603
Other
Scientific paper
We have identified a spiral galaxy (NGC4319) that appears to be in the process of transforming into an S0 galaxy. This spiral is embedded in X-ray emitting hot gas in the NGC4291 group, and it appears that ram pressure has stripped most of the H I out of the galaxy making it H I deficient and molecule-rich. Using a background Seyfert galaxy behind NGC4319, we have detected an array of ultraviolet absorption lines from the ISM of NGC4319 using high-resolution spectrographs on HST and FUSE. We find that the H I column density is surprisingly low, but nevertheless we detect 17 absorption lines of H_{2} from the J = 0, 1, 2, and 3 rotational levels. We have also observed the galaxy with the FCRAO 14m telescope, and we detect CO emission from the barred center. Here we propose to map NGC4319 and 3 nearby companion galaxies (in the same group) with IRAC and MIPS to investigate the following questions: (1) How does ram pressure and tidal stripping affect star formation in NGC4319? (2) Is there hidden spiral structure in the 3 companion S0 and elliptical galaxies (e.g., as observed by Pahre et al. in other lenticulars)? (3) How has ram pressure and tidal stripping affected the dust in these galaxies? (4) Is dust being ejected into the IGM of the group? Combined with our unique information from ultraviolet spectroscopy already obtained, this program will provide valuable insight on the effects of ram pressure and tidal stripping on galaxy evolution.
Bowen David
Song Limin
Tripp Todd
Yun Min
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