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HST Observations Of Giant Arcs

Published online by Cambridge University Press:  25 May 2016

Ian Smail ,
Alan Dressler ,
Jean-Paul Kneib ,
Richard S. Ellis ,
Warrick J. Couch ,
Ray M. Sharples  and
Augustus Oemler Jr.
Ian Smail
Affiliation:
The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101-1292
Alan Dressler
Affiliation:
The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101-1292
Jean-Paul Kneib
Affiliation:
Institute of Astronomy, Madingley Rd, Cambridge CB3 0HA, UK
Richard S. Ellis
Affiliation:
Institute of Astronomy, Madingley Rd, Cambridge CB3 0HA, UK
Warrick J. Couch
Affiliation:
School of Physics, University of NSW, Sydney 2052, NSW Australia
Ray M. Sharples
Affiliation:
Dept. of Physics, University of Durham, South Rd, Durham DE1 3LE, UK
Augustus Oemler Jr.
Affiliation:
Yale Observatory, New Haven, CT 06511

Abstract

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We discuss HST imaging of eight spectroscopically-confirmed giant arcs, pairs and arclets. Although our HST observations include both pre- and post-refurbishment images, the depth of the exposures guarantees that the majority of the arcs are detected with diffraction-limited resolution. We present the size information on these distant field galaxies in the light of HST studies of lower redshift samples. We suggest that the dominant population of star-forming galaxies at z ∼ 1 is a factor of 1.5–2 times smaller in size than the equivalent population in the local field. This implies either a considerable evolution in the sizes of star-forming galaxies within the last ∼10 Gyrs or a shift in the relative space densities of massive and dwarf star-forming systems over the same time scale.

Type
Chapter 5: Galaxy Clusters
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 119 - 124
Copyright
Copyright © Kluwer 1996 

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