Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-09-14
Astrophys.J. 435 (1994) L105
Astronomy and Astrophysics
Astrophysics
11 pages, uuencoded compressed PostScript, accepted to ApJ Letters, LICK-32
Scientific paper
10.1086/187605
We present HST images of 24 confirmed members of the distant galaxy cluster Cl0016+16 at redshift 0.55. The Balmer-strong (``E+A'') and emission- line galaxies frequently show unusual visual morphology, implying that galaxian interactions produce ``active'' galaxies in moderate-redshift clusters. We use the image concentration index as a quantitative measure of morphology to show that these unusual galaxies appear disklike, while the normal red galaxies resemble E/S0s. Although consistent with HST observations by Dressler et al. in Cl0939+4713 ($z=0.41$), our results differ from the Couch et al. finding that most Balmer-strong galaxies in AC114 ($z=0.31$) resemble ellipticals. The entire ``E+A'' sample is small, but if future studies confirm their diversity, it will suggest that they have different origins.
Koo David C.
Kron Richard G.
Wirth Gregory D.
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