Quasar-Marked Protoclusters and Biased Galaxy Formation

Details Quasar-Marked Protoclusters and Biased Galaxy Formation Quasar-Marked Protoclusters and Biased Galaxy Formation

1999-08-13

arxiv.org/abs/astro-ph/9908142v1

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure requires paspconf.sty. To be published in "Photometric Redshifts and the Detection of High Redshift Galaxies

Scientific paper

We report on the current status of our search for protoclusters around quasars at z > 4. While the search is still very incomplete, clustered companion galaxies are found in virtually every case examined so far. The implied comoving number densities of protogalaxies are two to four orders of magnitude higher than expected for the general field, but are comparable to the number densities in rich cluster cores. The comoving densities of star formation in these regions are also enhanced by a comparable factor. We interpret these results as an evidence for biased galaxy formation in the highest peaks of the primordial density field.

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