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Narrow-band forbidden O III imaging of the QSO 4C 18.68 - A tidal tail revealed?The z = 0.313 quasar 4C 18.68 and its surroundings in the light of redshifted forbidden O III were imaged. The QSO appears much more extended than in broad-band images, with a large halo and possibly a faint tidal tail discerned. A broad-band I CCD image taken in 1 - 1.2 arcsec seeing resolves the QSO from a companion galaxy 3.6 arcsec distant, similar to many others seen in the field. It is suggested that the elongated and asymmetric shapes of some QSOs may be due to not-quite-resolved companion galaxies, and that caution be exercised in interpreting luminosity and color profiles as evidence for underlying spiral or elliptical structure.
Document ID
19860026121
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1086/163458
Authors
Shara, M. M. (NASA Goddard Space Flight Center Greenbelt; Space Telescope Science Institute, Baltimore, MD, United States)
Moffat, A. F. J. (Montreal, Universite Montreal, Canada)
Albrecht, R. (NASA Goddard Space Flight Center Greenbelt; Space Telescope Science Institute, Baltimore, MD; ESA, Astrophysics Div., Garching, Germany)
Date Acquired
August 12, 2013
Publication Date
September 15, 1985
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 296
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
86A10859
Distribution Limits
Public
Copyright
Other

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