Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1803m&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #18.03; Bulletin of the American Astronomical Society, Vol. 24, p.1149
Astronomy and Astrophysics
Astronomy
Scientific paper
We compute the integrated UV background from observed QSOs, taking into account the hydrogen opacity associated with intervening Lyalpha clouds and Lyman limit systems. The QSO contribution over the range z=3-5 to the metagalactic flux at 912A is found to be as large as 6[(1+z)/4.5](0.5}*E({-22)) erg s(-1) cm(-2) Hz(-1) sr(-1) for q_0=0, and 3*E(-22) erg s(-1) cm(-2) Hz(-1) sr(-1) for q_0=0.5. We show that this ionizing flux is consistent with current 1sigma upper limits to the Gunn-Peterson optical depth tau_ {GP} at z =~ 3 if the density of the diffuse component of the IGM satisfies Omega_Dh_ {50}(2<0.025) . Models based on QSO photoionization can generate a value of tau_ {GP}<0.1 at z>= 3.8 only in the case of a highly clumped medium. We argue that the Lyalpha forest may indeed contain a large fraction of the baryons in the universe and estimate the corresponding mass density parameter to be in the range 0.002
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