NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Galaxies clustering around QSOs with z = 0.9-1.5 and the origin of blue field galaxiesDeep CCD images were obtained in Mould-Cousins R and I passbands of 16 radio quasars with z values between 0.9 and 1.5 and absolute values of b above 35 deg, chosen from the Veron-Cetty and Veron (1984) catalog. Results indicate that, in this population of radio quasars, there is a statistically significant excess of galaxies within 15 arcsec of the quasars and brighter than R = 23 and I = 22. However, contrary to the report of Tyson (1986), no excess was found of galaxies with R less than 21 lying within 30 arcsec of quasars in this redshift range. Data were also obtained for very blue galaxies seen among objects in the general field, all of which are bluer in R-I than Magellanic irregulars at any redshift less than 3. It is suggested that this population might be comprised of low-redshift low-luminosity (H II region) galaxies of the type studied by French (1980) and/or higher redshift galaxies with strong cooling flows and forbidden O II lines.
Document ID
19910034429
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hintzen, Paul (NASA Goddard Space Flight Center Greenbelt, MD; Nevada, University, Las Vegas, United States)
Romanishin, W. (Oklahoma, University Norman, United States)
Valdes, Francisco (National Optical Astronomy Observatory Tucson, AZ, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 366
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG8-576
Distribution Limits
Public
Copyright
Other