Other
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006enig.confe...9v&link_type=abstract
Proceedings of the 8th ENIGMA meeting, held in Espoo, Finland, September 6-8, 2006, Eds: T.Hovatta, E.Nieppola and I.Torniainen,
Other
Scientific paper
The evolution of quasar host galaxies is still hardly studied at high redshifts (z>2), although this is a very interesting redshift range as the quasar activity peaks at z≈2-3. We have studied the evolution of quasar host galaxies at high redshifts up to z≈3.4. Eight quasars from the FORS Deep Field were analyzed with redshifts lying between z=0.87 and z=3.37. We used the 2D-fitting program kimage to resolve the hostgalaxies. The quasars were studied in eight filters from the near UV to the near IR. Using the magnitudes in different filters we investigated the presumed galaxy type and the mass of the central black hole of the resolved galaxies. For four quasars between z=0.87 and z=2.75 their hostgalaxies could be resolved. The absolute k-corrected magnitudes in the I-band are between M_{I}=-22.22 and M_{I}=-26.80. One host galaxy was unambiguously identified as a disk galaxy, for the other host galaxies such a clear identification was not possible. The upper limits for the masses of the central black holes are ˜10^{7}-10^{8}M_{&sun;}. Comparing our results with those of other authors we found that host galaxies of radio-loud and radio-quiet evolve differently; if corrected for passive evolution the absolute magnitude of host galaxies of radio-loud quasars stays constant up to a redshift of z≈3 whereas the absolute magnitude of host galaxies of radio-quiet quasars decreases distinctly at redshifts higher than z≈2.
Heidt Jochen
Nilsson Kim K.
Villforth Carolin
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