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Spatially Resolved Spectroscopy of Starburst and Post-Starburst Galaxies in the Rich z~0.55 Cluster CL 0016+16 1
Pracy, Michael B.; Couch, Warrick J.; Kuntschner, Harald
AA(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia ), AB(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia), AC(Space Telescope European Coordinating Facility, European Southern Observatory, Karl-Schwarzschild Strasse 2, 85748, Garching bei München, Germany)
Publications of the Astronomical Society of Australia, Volume 27, Issue 3, pp. 360-373. (PASA Homepage)
Publication Date:
Astronomy Keywords:
galaxies: clusters: individual (CL 0016+16), galaxies: evolution, galaxies: starbursts
Abstract Copyright:
(c) 2010 Astronomical Society of Australia
Bibliographic Code:


We have used the Low Resolution Imaging Spectrograph on the W. M. Keck I telescope to obtain spatially resolved spectroscopy of a small sample of six `post-starburst' and three `dusty-starburst' galaxies in the rich cluster CL 0016+16 at z=0.55. We use this to measure radial profiles of the Hdelta and [OII]lambda3727 lines which are diagnostic probes of the mechanisms that give rise to the abrupt changes in star formation rates in these galaxies. In the post-starburst sample we are unable to detect any radial gradients in the Hdelta line equivalent width - although one galaxy exhibits a gradient from one side of the galaxy to the other. The absence of Hdelta gradients in these galaxies is consistent with their production via interaction with the intra-cluster medium; however, our limited spatial sampling prevents us from drawing robust conclusions. All members of the sample have early-type morphologies, typical of post-starburst galaxies in general, but lack the high incidence of tidal tails and disturbances seen in local field samples. This argues against a merger origin and adds weight to a scenario where truncation by the intra-cluster medium is at work. The post-starburst spectral signature is consistent over the radial extent probed with no evidence of [OII]lambda3727 emission and strong Hdelta absorption at all radii, i.e. the post-starburst classification is not an aperture effect. In contrast the `dusty-starburst' sample shows a tendency for a central concentration of [OII]lambda3727 emission. This is most straightforwardly interpreted as the consequence of a central starburst. However, other possibilities exist such as a non-uniform dust distribution (which is expected in such galaxies) and/or a non-uniform starburst age distribution. The members of the sample exhibit late-type and irregular morphologies.
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