Journal Article

Clustering of Lyα emitters around luminous quasars at <i>z</i>= 2–3: an alternative probe of reionization on galaxy formation

Loren R. Bruns, J. Stuart B. Wyithe, Joss Bland-Hawthorn and Mark Dijkstra

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 3, pages 2543-2552
Published in print April 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI:

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Narrow-band observations fail to detect Lyα emission within a volume centred on the z= 2.168 quasar PKS 0424–131. This is in contrast to surveys of Lyα emitters in the field at similar redshifts and flux limits, which indicate that tens of sources should be visible within the same volume. The observed difference indicates that the quasar environment has a significant influence on the observed density of Lyα emitters. To quantify this effect, we have constructed a semi-analytic model to simulate the effect of a luminous quasar on nearby Lyα emitters. We find the null detection around PKS 0424–131 implies that the minimum isothermal temperature of Lyα emitter host haloes is greater than (68 per cent level), corresponding to a virial mass of ∼1.2 × 1012 M. This indicates that the intense ultraviolet emission of the quasar may be suppressing the star formation in nearby galaxies. Our study illustrates that low-redshift quasar environments may serve as a surrogate for studying the radiative suppression of galaxy formation during the epoch of reionization.

Keywords: galaxies: clusters: general; intergalactic medium; quasars: general; cosmology: theory; ultraviolet: galaxies

Journal Article.  8362 words.  Illustrated.

Subjects: Astronomy and Astrophysics