Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-27T09:45:57.548Z Has data issue: false hasContentIssue false
  • English
  • Français

Spatially Resolved Spectroscopy of Starburst and Post-Starburst Galaxies in the Rich z ∼0.55 Cluster CL 0016+161

Published online by Cambridge University Press:  02 January 2013

Michael B. Pracy ,
Warrick J. Couch  and
Harald Kuntschner
Michael B. Pracy*
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia
Warrick J. Couch
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia
Harald Kuntschner
Affiliation:
Space Telescope European Coordinating Facility, European Southern Observatory, Karl-Schwarzschild Strasse 2, 85748, Garching, Germany
*
CCorresponding author. Email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 Hδ and [OII]λ3727 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 Hδ line equivalent width — although one galaxy exhibits a gradient from one side of the galaxy to the other. The absence of Hδ gradients in these galaxies is consistent with their production via interaction with the intracluster 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]λ3727 emission and strong Hδ 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]λ3727 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.

Keywords

galaxies: clusters: individual (CL 0016+16)galaxies: evolutiongalaxies: starbursts
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 27 , Issue 3 , 2010 , pp. 360 - 373
Copyright
Copyright © Astronomical Society of Australia 2010

Footnotes

1

The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

References

Barnes, J. E. & Hernquist, L. E., 1991, ApJ, 370, L65Google Scholar
Bekki, K., 1999, ApJ, 510, L15CrossRefGoogle Scholar
Bekki, K., Couch, W. J., Shioya, Y. & Vazdekis, A., 2005, MNRAS, 359, 949Google Scholar
Bekki, K., Shioya, Y. & Couch, W. J., 2001, ApJ, 547, L17CrossRefGoogle Scholar
Blake, C., Pracy, M. B., Couch, W. J., Bekki, K., Lewis, I. & 26 other authors, 2004, MNRAS, 355, 713CrossRefGoogle Scholar
Bothun, G. D. & Dressler, A., 1986, ApJ, 301, 57CrossRefGoogle Scholar
Bournaud, F., Bois, M., Emsellem, E. & Duc, P. A., 2008, AN, in pressGoogle Scholar
Butcher, H. & Oemler, A. Jr., 1978, ApJ, 226, 559CrossRefGoogle Scholar
Butcher, H. & Oemler, A. Jr., 1984, ApJ, 285, 426CrossRefGoogle Scholar
Caldwell, N., Rose, J. A., Franx, M. & Leonardi, A. J., 1996, AJ, 111, 78CrossRefGoogle Scholar
Cappellari, M. & Emsellem, E., 2004, PASP, 116, 138Google Scholar
Couch, W. J., Ellis, R. S., Sharples, R. M. & Smail, I., 1994, ApJ, 430, 121Google Scholar
Couch, W. J. & Sharples, R. M., 1987, MNRAS, 229, 423CrossRefGoogle Scholar
Dressler, A. & Gunn, J. E., 1982, ApJ, 263, 533Google Scholar
Dressler, A. & Gunn, J. E., 1983, ApJ, 270, 7Google Scholar
Dressler, A. & Gunn, J. E., 1992, ApJS, 78, 1CrossRefGoogle Scholar
Dressler, A., Oemler, A. Jr., Poggianti, B. M., Smail, I., Trager, S., Shectman, S. A., Couch, W. J. & Ellis, R. S., 2004, ApJ, 617, 867Google Scholar
Dressler, A., Smail, I., Poggianti, B. M., Butcher, H., Couch, W. J., Ellis, R. S. & Oemler, A. J., 1999, ApJS, 122, 51CrossRefGoogle Scholar
Goto, T., 2007, MNRAS, 381, 187CrossRefGoogle Scholar
Goto, T., Kawai, A., Shimono, A., Sugai, H., Yagi, M. & Hattori, T., 2008, arXiv:0801.1109v01, 801Google Scholar
Graham, A. W., Erwin, P., Trujillo, I. & Asensio Ramos, A., 2003, AJ, 125, 2951Google Scholar
Gunn, J. E. & Gott, J. R. I., 1972, ApJ, 176, 1CrossRefGoogle Scholar
Mihos, J. C. & Hernquist, L., 1996, ApJ, 464, 641CrossRefGoogle Scholar
Mihos, J. C., Richstone, D. O. & Bothun, G. D., 1992, ApJ, 400, 153Google Scholar
Moore, B., Katz, N., Lake, G., Dressler, A. & Oemler, A., 1996, Nat, 379, 613CrossRefGoogle Scholar
Noguchi, M., 1988, A&A, 203, 259Google Scholar
Norton, S. A., Gebhardt, K., Zabludoff, A. I. & Zaritsky, D., 2001, ApJ, 557, 150CrossRefGoogle Scholar
Poggianti, B. M., Smail, I., Dressler, A., Couch, W. J., Barger, A. J., Butcher, H., Ellis, R. S. & Oemler, A. J., 1999, ApJ, 518, 576CrossRefGoogle Scholar
Poggianti, B. M. & Wu, H., 2000, ApJ, 529, 157Google Scholar
Poggianti, B. M. et al. , 2009, ApJ, 693, 112Google Scholar
Pracy, M. B., Couch, W. J., Blake, C., Bekki, K., Harrison, C., Colless, M., Kuntschner, H. & de Propris, R., 2005, MNRAS, 359, 1421CrossRefGoogle Scholar
Pracy, M. B., Kuntschner, H., Couch, W. J., Blake, C., Bekki, K. & Briggs, F., 2009, MNRAS, 396, 1349Google Scholar
Rose, J. A., Gaba, A. E., Caldwell, N. & Chaboyer, B., 2001, AJ, 121, 793CrossRefGoogle Scholar
Tran, K., Franx, M., Illingworth, G. D., van Dokkum, P., Kelson, D. D. & Magee, D., 2004, ApJ, 609, 683CrossRefGoogle Scholar
Vazdekis, A. et al. , 2007, AJ, 133, 468Google Scholar
Worthey, G. & Ottaviani, D. L., 1997, ApJS, 111, 377Google Scholar
Yamauchi, C. & Goto, T., 2005, MNRAS, 359, 1557CrossRefGoogle Scholar
Yang, Y., Zabludoff, A. I., Zaritsky, D. & Mihos, J. C., 2008, ApJ, 688, 945CrossRefGoogle Scholar
Zabludoff, A. I., Zaritsky, D., Lin, H., Tucker, D., Hashimoto, Y., Shectman, S. A., Oemler, A. & Kirshner, R. P., 1996, ApJ, 466, 104CrossRefGoogle Scholar