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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358750.0, MPI für Astronomie / Publikationen_mpia
The luminosity function of high-redshift quasi-stellar objects. A combined analysis of GOODS and SDSS
Authors:Fontanot, F.; Cristiani, S.; Monaco, P.; Nonino, M.; Vanzella, E.; Brandt, W. N.; Grazian, A.; Mao, J.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Astronomy and Astrophysics
Start Page:39
End Page:48
Audience:Not Specified
Abstract / Description:Aims.In this work the luminosity function of QSOs is measured in the redshift range 3.5<z<5.2 for the absolute magnitude interval -21<M145<-28. Determining the faint-end of the luminosity function at these redshifts provides important constraints on models of the joint evolution of galaxies and AGNs.<BR /> Methods: .We have defined suitable criteria to select faint QSOs in the GOODS fields, checking their effectiveness and completeness in detail. A spectroscopic follow-up of the resulting QSO candidates was carried out. The confirmed sample of faint QSOs is compared with a brighter one derived from the SDSS. We used a Monte-Carlo technique to estimate the properties of the luminosity function, checking various parameterizations for its shape and evolution.<BR /> Results: .Models based on pure density evolution show better agreement with observation than do models based on pure luminosity evolution. However, a different break magnitude with respect to z˜ 2.1 is required at 3.5<z<5.2. Models with a steeper faint-end score a higher probability. We do not find any evidence for a bright-end flattening at redshift z>3.5.<BR /> Conclusions: .The estimated space density evolution of QSOs indicates a suppression of the formation and/or feeding of supermassive black holes at these redshifts. The QSO contribution to the UV background is insufficient for ionizing the IGM at 3.5<z<5.2.
Free Keywords:quasars: general; galaxies: active; cosmology:; observations
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie

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