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Photometry of compact galaxies.Photometric histories of the N galaxies 3C 390.3 and PKS 0521-36. Four other compact galaxies, Markarian 9, I Zw 92, 2 Zw 136, and III Zw 77 showed no evidence of variability. The photometric histories were obtained from an exhaustive study of those plates of the Harvard collection taken with large aperture cameras. The images of all galaxies reported were indistinguishable from stars due to the camera f-ratios and low surface brightness of the outlying nebulosities of the galaxies. Standard techniques for the study of variable stars are therefore applicable.
Document ID
19720034220
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Shen, B. S. P.
(Pennsylvania, University Philadelphia, Pa., United States)
Usher, P. D.
(Pennsylvania State University University Park, Pa., United States)
Barrett, J. W.
(Arizona, University Tucson, Ariz., United States)
Date Acquired
August 6, 2013
Publication Date
February 1, 1972
Publication Information
Publication: Astrophysical Journal
Volume: 171
Subject Category
Space Sciences
Accession Number
72A17886
Funding Number(s)
CONTRACT_GRANT: NSF IG-70-21
CONTRACT_GRANT: NSF GP-16852
CONTRACT_GRANT: NGR-39-010-114
Distribution Limits
Public
Copyright
Other

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