Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996stin...9621450f&link_type=abstract
Technical Report, Institute for Advanced Study; Pennsylvania State Univ. Princeton, NJ United States; University Park, PA United
Astronomy and Astrophysics
Astrophysics
Brightness, Galactic Clusters, Quasars, Red Shift, Stellar Systems, Hubble Space Telescope, Astronomical Observatories, Celestial Bodies
Scientific paper
We examine the clustering of galaxies around a sample of 20 luminous low redshift (z approximately less than 0.30) quasars observed with the Wide Field Camera-2 on the Hubble Space Telescope. The HST resolution makes possible galaxy identification brighter than V = 24.5 and as close as 2 arc-seconds to the quasar. We find a significant enhancement of galaxies within a projected separation of approximately less than 100 (h exp -1)kpc of the quasars. The galaxy distribution around the quasars inconsistent with the observed slope of the galaxy/galaxy correlation function, but has an amplitude 3.8 +/- 0.8 times larger. The galaxy counts within r less than 15 (h exp -1)kpc of the quasars are too high for the density profile to have an appreciable core radius (approximately greater than 100 (h exp -1)kpc). Our results reinforce the idea that low redshift quasars are located preferentially in groups of 10-20 galaxies rather than in rich clusters. We see no significant difference in the clustering amplitudes derived from radio-loud and radio-quiet subsamples.
Bahcall John N.
Fisher Karl B.
Kirhakos Sofia
Schneider Donald P.
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