Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297...61b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. 61-76
Astronomy and Astrophysics
Astrophysics
52
Galactic Evolution, H Lines, Morphology, Red Shift, Spectral Energy Distribution, Astronomical Photometry, Galactic Clusters, Star Formation, Starburst Galaxies
Scientific paper
We present results of a study of E+A galaxies in the cluster C10939+472 (z = 0.41). We have used a series of narrowband filters full width at half-maximum (FWHM) approximately equal to 90-200 A) covering the range from 3800 to 9200 A, and broad band B, R, I filters to obtain low resolution spectra for all galaxies brighter than R = 22.5 mag in a 5' x 5' cluster field. Two of the narrow-band filters have been chosen to measure the 4000 A-break index, and 3 filters were centered on the Hbeta, Hgamma and Hdelta lines which are indicators of recent star formation. Template spectra were fitted to the low-resolution spectral energy distributions in order to determine the redshift and to assign a corresponding morphological type for each galaxy in the sample. The E+A templates were derived from a model which assumes that a strong star formation episode took place in an early-type galaxy 1-2 Gyr before its observational epoch (post starburst models). We detected 35 E+A galaxies in this part of the cluster, 21% of the total number of galaxies investigated. Their projected radial distribution shows that they are less concentrated than ellipticals. Moreover, we identified half of them on high resolution HST images. Their morphology indicated that this kind of activity is associated with disk-like systems or mergers. Two cluster members, an unusually blue elliptical galaxy and a merger, seem to be going through an early phase of the starburst evolution, in which the second burst is still ongoing.
Belloni Paola
Bruzual Gustavo A.
Röser Hermann-Josef
Thimm Guido J.
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