Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20714804c&link_type=abstract
American Astronomical Society Meeting 207, #148.04; Bulletin of the American Astronomical Society, Vol. 37, p.1406
Astronomy and Astrophysics
Astronomy
Scientific paper
Clusters play an important role in the evolution of their member galaxies. In the nearby Virgo cluster, we can observe galaxy-galaxy and galaxy-cluster interactions at a level of detail not easily accessible at higher redshift. We present results of an observational study of spiral galaxies in the Virgo Cluster, utilizing optical and UV imaging, HI observations, and optical spectroscopy. These galaxies, many of which have normal stellar distributions and truncated gas disks, are likely the result of ram-pressure stripping by hot cluster gas. Our results indicate that there is a correlation between HI morphology and the age-sensitive Balmer absorption line strength. Specifically, those galaxies with asymmetric HI distributions or extraplanar HI, indicating a recent disturbance by the intra-cluster medium, have the youngest stellar populations in the gas-free outer disk. Observations of both gas and stellar populations allow us to understand when and where galaxies are transformed by gas stripping effects in clusters.
One of the most striking galaxies in our sample is NGC 4522. This galaxy, with a large fraction of its neutral gas displaced to one side of the stellar disk, is one of the best examples of ongoing ram pressure stripping in Virgo. Optical spectroscopy of the outer disk of NGC 4522 (i.e. beyond the sites of active star formation), shows strong Hβ absorption, indicative of a young stellar population and consistent with a recent truncation of star formation in the outer disk. Additionally, we observe strong Hγ and Hδ absorption, similar to post-starburst k+a galaxies at higher redshift. This suggests that some k+a galaxies observed at higher redshift may be recently stripped cluster spirals.
No associations
LandOfFree
Stellar Populations of Stripped Spiral Galaxies in the Virgo Cluster 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 Stellar Populations of Stripped Spiral Galaxies in the Virgo Cluster, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stellar Populations of Stripped Spiral Galaxies in the Virgo Cluster will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1286698