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Caltech Faint Galaxy Redshift Survey. XV. Classifications of Galaxies with 0.2 < z < 1.1 in the Hubble Deep Field North and its Flanking Fields

van den Bergh, Sidney and Cohen, Judith G. and Crabbe, Christopher (2001) Caltech Faint Galaxy Redshift Survey. XV. Classifications of Galaxies with 0.2 < z < 1.1 in the Hubble Deep Field North and its Flanking Fields. Astronomical Journal, 122 (2). pp. 611-620. ISSN 0004-6256. doi:10.1086/321173.

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To circumvent the spatial effects of resolution on galaxy classification, the images of 233 objects of known redshift in the Hubble Deep Field (HDF) and its flanking fields that have redshifts in the range 0.20 < z < 1.10 were degraded to the resolution that they would have had if they were all located at a redshift of z = 1.00. As in Paper XIV of the present series, the effects of shifts in rest wavelength were mitigated by using R-band images for the classification of galaxies with 0.2 < z < 0.6 and I-band images for objects with redshifts 0.6 < z < 1.1. A special effort was made to search for bars in distant galaxies. The present data strongly confirm the previous conclusion that the Hubble tuning fork diagram only provides a satisfactory framework for the classification of galaxies with z < 0.3. More distant disk galaxies are often difficult to shoehorn into the Hubble classification scheme. The paucity of barred spirals and grand-design spirals at large redshifts is confirmed. It is concluded that the morphology of disk galaxies observed at look-back times smaller than 3–4 Gyr differs systematically from that of more distant galaxies viewed at look-back times of 4–8 Gyr. The disks of late-type spirals at z > 0.5 are seen to be more chaotic than those of their nearer counterparts. Furthermore, the spiral structure in distant early-type spirals appears to be less well developed than it is in nearby early galaxies.

Item Type:Article
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URLURL TypeDescription Paper
Cohen, Judith G.0000-0002-8039-4673
Alternate Title:Caltech Faint Galaxy Redshift Survey XV: Classification of Galaxies with 0.2 < z < 1.1 in the Hubble Deep Field (North) and its Flanking Fields
Additional Information:© 2001 The American Astronomical Society. Received 2001 April 15; accepted 2001 May 2. Based in part on observations 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. We are indebted to Roger Blandford and David Hogg for their assistance and advice during the course of the present investigation. We also thank Bob Abraham for his help with the figures.
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W. M. Keck FoundationUNSPECIFIED
Subject Keywords:galaxies : evolution - galaxies : formation - surveys
Issue or Number:2
Record Number:CaltechAUTHORS:20190524-090754573
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Official Citation:Sidney van den Bergh et al 2001 AJ 122 611
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95778
Deposited By: Tony Diaz
Deposited On:24 May 2019 16:14
Last Modified:16 Nov 2021 17:15

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