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QSO-Galaxy Correlations: Lensing or Dust?

Published online by Cambridge University Press:  05 March 2013

Scott M. Croom
Scott M. Croom*
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia
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Abstract

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We present evidence for an anti-correlation between faint QSOs and B < 23 galaxies.A sample of 192 QSOs in a 2.5 deg2 area has been imaged using the Isaac Newton Telescope Wide-Field Camera. The cross-correlation signal is of a similar amplitude to the galaxy auto-correlation function at the limit of B < 23, but is negative in sign. As fainter galaxies are selected the negative correlation signal becomes less significant, until the signal is effectively zero at B < 26. We propose two alternate explanations for the observed effect. The first is gravitational lensing of the faint background QSOs, which have a flat number count slope. However, the lensing signal is significantly higher than expected in conventional models. The second possibility is that inter-galactic dust absorption is responsible. A reddening of only E(B - V) ≃ 0.02 is required to produce the observed correlation. The large 2dF and SDSS QSO surveys should allow a definitive solution to the question of QSO–galaxy correlations.

Keywords

gravitational lensinggalaxies:statisticsquasars: generaldust, extinction
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 18 , Issue 2 , 2001 , pp. 169 - 171
Copyright
Copyright © Astronomical Society of Australia 2001

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