On the Faint End of the High‐Redshift Active Galactic Nucleus Luminosity Function | Zendy

Francesco Shankar | Zendy; Smita Mathur | Zendy

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On the Faint End of the High‐Redshift Active Galactic Nucleus Luminosity Function

Author(s) -

Francesco Shankar,

Smita Mathur

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/512845

Subject(s) - physics , astrophysics , active galactic nucleus , reionization , redshift , luminosity function , quasar , galaxy , dark matter , halo , hubble deep field , astronomy , luminosity , cosmology

Using the results of recent optical surveys we conclude that the {\itnon}-detection of quasars down to faint magnitudes implies a significantflattening of the high redshift (z~6) optical active galactic nuclei (AGN)luminosity function for M_{1450}>-24.7. We find that all the data areconsistent with a faint-end slope for the optical AGN luminosity function of\beta=-2.2 and \beta=-2.8, at the 90% and 99% confidence level respectively,flatter than the bright-end slope of \beta'~ -3.2. We also show that X-ray deepsurveys have probed even fainter magnitudes than the optical ones yielding moresignificant constraints on the shallow faint-end slope of the opticalluminosity function. The inclusion of Type II AGN candidates, detected in theChandra deep fields, hints towards an higher normalization for the total AGNluminosity function, if these sources lie at 5

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