The faint end of the QSO luminosity function at z=3

Details The faint end of the QSO luminosity function at z=3 The faint end of the QSO luminosity function at z=3

2003-12-01

arxiv.org/abs/astro-ph/0312041v2

Astrophys.J. 605 (2004) 625-630

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/381727

We present the first measurement of the faint end of the QSO luminosity function at z=3. The QSOs, which range from M_1450 = -21 to M_1450 = -27, were discovered in 17 fields totaling 0.43 deg^2 using multicolor selection criteria (the Lyman break technique) and spectroscopic followup. We find that the faint-end slope of the luminosity function is beta_l=1.24 +/- 0.07, flatter than the value of beta_l=1.64 +/- 0.18 measured at lower redshift. The integrated rest 1450 A UV luminosity of z=3 QSOs is only 50% of most previous estimates, and is only ~8% of that produced by Lyman break galaxies at the same redshifts. Assuming that ionizing photons from faint QSOs are as successful in escaping their host galaxies as bright QSOs, we estimate the total contribution of QSOs to the ionizing flux J_912 at z=3, J_912=2.4*10^-22 ergs/s/cm^2/Hz. This estimate, which we regard as an upper limit, remains consistent with rough estimates of J_912 based on the Lyman-alpha forest "proximity effect."

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