NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-19 T23:09:52 PDT
Help | Comment | NED Home

For refcode 2006AJ....131..716K:
Retrieve 104 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2006AJ....131..716K A Comparison of H{alpha} and Stellar Scale Lengths in Virgo and Field Spirals Rebecca A. Koopmann, Martha P. Haynes, and Barbara Catinella Abstract. The scale lengths of the old stars and ionized gas distributions are compared for similar samples of Virgo Cluster members and field spiral galaxies via H{alpha} and broad R-band surface photometry. While the R-band and H{alpha} scale lengths are, on average, comparable for the combined sample, we find significant differences between the field and cluster samples. While the H{alpha} scale lengths of the field galaxies are a factor of 1.14+/-0.07 longer, on average, than their R-band scale lengths, the H{alpha} scale lengths of Virgo Cluster members are, on average, 20% smaller than their R-band scale lengths. Furthermore, in Virgo, the scale length ratios are correlated with the size of the star-forming disk: galaxies with smaller overall H{alpha} extents also show steeper radial falloff of star formation activity. At the same time, we find no strong trends in scale length ratio as a function of other galaxy properties, including galaxy luminosity, inclination, morphological type, central R-band light concentration, or bar type. Our results for H{alpha} emission are similar to other results for dust emission, suggesting that H{alpha} and dust have similar distributions. The environmental dependence of the H{alpha} scale length places additional constraints on the evolutionary process(es) that cause gas depletion and a suppression of the star formation rate in clusters of galaxies. Key words: Galaxies: Clusters: General, Galaxies: Clusters: Individual: Name: Virgo, Galaxies: Formation, Galaxies: Fundamental Parameters, Galaxies: Spiral, Galaxies: Structure
Retrieve 104 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home