The clustering of QSOs at low redshift

Details The clustering of QSOs at low redshift The clustering of QSOs at low redshift

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..925b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 4, p. 925-928.

Astronomy and Astrophysics

Astronomy

47

Correlation, Galactic Clusters, Quasars, Red Shift, Cosmology, Radio Galaxies, Seyfert Galaxies

Scientific paper

We have determined the correlation function, ksi(r), for QSOs with z less than 0.2 in the Einstein Extended Medium Sensitivity Survey (EMSS). At small scales we obtain a barely significant level of clustering, ksi(less than 10/ h Mpc) = 0.7 +/- 0.6. This amplitude of clustering is most consistent with the amplitude of QSO clustering derived at higher redshifts (z is approximately equal to 1.5) if the evolution of clustering is governed by a 'comoving' or biased model. The 'stable' model for the evolution of the QSO correlation function is marginally excluded by these observations, while models in which the QSO clusters are collapsing over this redshift interval are strongly excluded. At large scales, ksi(r) is greater than 100/h Mpc, the correlation function is consistent with an unclustered population: ksi(r) = 0.00 +/- 0.03.

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