Hα surface photometry in Virgo (Gavazzi+, 2002)

Details Hα surface photometry in Virgo (Gavazzi+, 2002) Hα surface photometry in Virgo (Gavazzi+, 2002)

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ycat..33960449g&link_type=abstract

VizieR On-line Data Catalog: J/A+A/396/449. Originally published in: 2002A&A...396..449G

Computer Science

Clusters: Galaxy, Galaxies: Photometry, Photometry: Surface

Scientific paper

Hα+[NII] imaging observations of 369 late-type (spiral) galaxies in the Virgo cluster and in the Coma/A1367 supercluster are analyzed, covering 3 rich nearby clusters (A1367, Coma and Virgo) and nearly isolated galaxies in the Great-Wall. They constitute an optically selected sample (mp<16.0) observed with ~60% completeness. These observations provide us with the current (T<107yrs) star formation properties of galaxies that we study as a function of the clustercentric projected distances (Theta). The expected decrease of the star formation rate (SFR), as traced by the Hα equivalent width, with decreasing Theta is found only when galaxies brighter than Mp~19.5 are considered. Fainter objects show no or reverse trends. We also include in our analysis Near Infrared data, providing information on the old (T>109yrs) stars. Put together, the young and the old stellar indicators give the ratio of currently formed stars over the stars formed in the past, or "birthrate" parameter b. For the considered galaxies we also determine the "global gas content" combining HI with CO observations. We define the "gas deficiency'' parameter as the logarithmic difference between the gas content of isolated galaxies of a given Hubble type and the measured gas content.
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