The Evolution of Quasars at High Redshift and Their Connection with Galaxies
نویسنده
چکیده
I review recent observations on the evolution of quasars, describe new surveys for quasars at z > 5 and for quasars with z > 3.3 down to luminosities corresponding to L* galaxies, and note the possible connection between the evolution of the star formation rate in young galaxies and the evolution of quasars.
منابع مشابه
Near-infrared Adaptive Optics Imaging of High-redshift Quasars
The properties of high-redshift quasar host galaxies are studied in order to investigate the connection between galaxy evolution, nuclear activity, and the formation of supermassive black holes. We combine new near-IR observations of three high-redshift quasars (2 < z < 3), obtained at the ESOVery Large Telescope equipped with adaptive optics, with selected data from the literature. For the thr...
متن کاملQuasar Hosts and the Black Hole-Spheroid Connection
I review our current understanding of the structures and ages of the host galaxies of quasars, and the masses of their central black holes. At low redshift, due largely to the impact of the Hubble Space Telescope, there is now compelling evidence that the hosts of quasars with MV < −24 mag are virtually all massive ellipticals, with basic properties indistinguishable from those displayed by the...
متن کاملStudy of Possible Local Quasars I: The First Sample
This study provides new arguments for the existence of local quasars, i.e. quasars in the vicinity of low redshift galaxies. Local quasars are probably ejected from respective parent galaxy. The sample includes 74 quasars in the vicinity of 8 different galaxies. Assuming for quasars the same distances from the observer, as for their respective parent galaxy, simple calculations lead to the quas...
متن کاملA Proposed Mechanism for the Intrinsic Redshift and its Preferred Values Purportedly Found in Quasars Based on the Local-Ether Theory
Quasars of high redshift may be ejected from a nearby active galaxy of low redshift. This physical association then leads to the suggestion that the redshifts of quasars are not really an indication of their distances. In this investigation, it is argued that the high redshift can be due to the gravitational redshift as an intrinsic redshift. Based on the proposed local-ether theory, this intri...
متن کاملQuasar Host Galaxies in the FORS Deep Field
Context. The evolution of quasar host galaxies is still hardly studied at high redshifts (z > 2), although this is a very interesting redshift range as both the quasar activity and the star formation rate density have their peak at z ≈ 2–3. This makes is especially interesting to study properties of quasar host galaxies, such as the star formation rate or the black hole mass at this redshift. A...
متن کامل