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The HST Medium Deep Survey: Galaxy Morphology at High Redshift

Published online by Cambridge University Press:  25 May 2016

R. E. Griffiths ,
K. U. Ratnatunga ,
S. Casertano ,
M. Im ,
L. W. Neuschaefer ,
R. S. Ellis ,
G. F. Gilmore ,
R. A. W. Elson ,
K. Glazebrook  and
B. Santiago
...Show all authors
R. E. Griffiths
Affiliation:
JHU, Homewood Campus, Baltimore, MD 21218, USA
K. U. Ratnatunga
Affiliation:
JHU, Homewood Campus, Baltimore, MD 21218, USA
S. Casertano
Affiliation:
JHU, Homewood Campus, Baltimore, MD 21218, USA
M. Im
Affiliation:
JHU, Homewood Campus, Baltimore, MD 21218, USA
L. W. Neuschaefer
Affiliation:
JHU, Homewood Campus, Baltimore, MD 21218, USA
R. S. Ellis
Affiliation:
Institute of Astronomy, U. Cambridge
G. F. Gilmore
Affiliation:
Institute of Astronomy, U. Cambridge
R. A. W. Elson
Affiliation:
Institute of Astronomy, U. Cambridge
K. Glazebrook
Affiliation:
Institute of Astronomy, U. Cambridge
B. Santiago
Affiliation:
Institute of Astronomy, U. Cambridge
R. A. Windhorst
Affiliation:
ASU, Tempe, AZ
S. P. Driver
Affiliation:
ASU, Tempe, AZ
E. J. Ostrander
Affiliation:
ASU, Tempe, AZ
S. B. Mutz
Affiliation:
ASU, Tempe, AZ
D. C. Koo
Affiliation:
Lick Obs., UCSC
G. D. Illingworth
Affiliation:
Lick Obs., UCSC
D. A. Forbes
Affiliation:
Lick Obs., UCSC
A. C. Phillips
Affiliation:
Lick Obs., UCSC
R. F. Green
Affiliation:
NOAO, Tucson, AZ
J. P. Huchra
Affiliation:
Harvard-Smithsonian CfA, Cambridge, MA
A. J. Tyson
Affiliation:
AT&T Bell Labs., NJ

Abstract

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With HST and WFPC2, galaxies in the Medium Deep Survey can be reliably classified to magnitudes I814 ≲ 22.0 in the F814W band, at a mean redshift . The main result is the relatively high proportion (~40%) of objects which are in some way irregular or anomalous, and which are of relevance in understanding the origin of the familiar excess population of faint galaxies. These diverse objects include compact galaxies, apparently interacting pairs, galaxies with superluminous starforming regions and diffuse low surface brightness galaxies of various forms. The ‘irregulars’ and ‘peculiar’ galaxies contribute most of the excess counts in the I-band at our limiting magnitude, and may explain the ‘faint blue galaxy’ problem.

Type
Part I: Invited Reviews
Information
Symposium - International Astronomical Union , Volume 168: Examining the Big Bang and the Diffuse Background Radiations , 1996 , pp. 219 - 227
Copyright
Copyright © Kluwer 1996 

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