High-Redshift Quasars as Probes of Galaxy and Cluster Formation

Details High-Redshift Quasars as Probes of Galaxy and Cluster Formation High-Redshift Quasars as Probes of Galaxy and Cluster Formation

1999-10-14

arxiv.org/abs/astro-ph/9910251v1

Astronomy and Astrophysics

Astrophysics

Invited review, to appear in ``The Hy-Redshift Universe: Galaxy Formation and Evolution at High Redshift'', eds. A.J. Bunker a

Scientific paper

Quasars at large redshifts provide a powerful probe of structure formation in the early universe. Several arguments suggest that the formation of ellipticals and massive bulges may have involved an early quasar phase. At very large redshifts, such structures are likely to be found at the highest peaks of the density field, and would thus be highly biased tracers: the earliest (massive) galaxy formation may have occurred in the cores of future rich clusters. Preliminary results from our search for clustered protogalaxies around quasars at z > 4 support this idea. Quasars at even larger redshifts may be an important contributor to the reionisation of the universe, and signposts of the earliest galaxy and cluster formation.

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