Narrow-band forbidden O III imaging of the QSO 4C 18. 68 - a tidal tail revealed
Journal Article
·
· Astrophys. J.; (United States)
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 ellipticalstructure. 21 references.
- Research Organization:
- NASA, Goddard Space Flight Center, Greenbelt; Space Telescope Science Institute, Baltimore, MD; Montreal Universite, Canada; ESA, Garching, West Germany
- OSTI ID:
- 5733708
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 296; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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