SIMBAD references

2019MNRAS.483...19M - Mon. Not. R. Astron. Soc., 483, 19-37 (2019/February-2)

The role of galaxies and AGNs in reionizing the IGM - II. Metal-tracing the faint sources of reionization at 5 <= z <= 6.


Abstract (from CDS):

We present a new method to study the contribution of faint sources to the ultraviolet background using the 1D correlation of metal absorbers with the intergalactic medium transmission in a quasi-stellar object (QSO) sightline. We take advantage of a sample of 25 high signal-to-noise ratio QSO spectra to retrieve 150 triply-ionized carbon (C IV) absorbers at 4.5 <= z <= 6.2, of which 37 systems whose expected H I absorption lie in the Lyman-α forest. We derive improved constraints on the cosmic density of C IV at 4.3 < z < 6.2 and infer from abundance matching that C IV absorbers trace MUV <= -16 galaxies. Correlation with the Lyman-α forest of the QSOs indicates that these objects are surrounded by a highly opaque region at r <= 5 cMpc h1 followed by an excess of transmission at r >= 10 cMpc h1 detected at 2.7σ. This is in contrast to equivalent measurements at lower redshifts where only the opaque trough is detected. We interpret this excess as a statistical enhancement of the local photoionization rate due to clustered faint galaxies around the C IV absorbers. Using the analytical framework described in Paper I of this series, we derive a constraint on the average product of the escape fraction and the Lyman continuum photon production efficiency of the galaxy population clustered around the C IV absorbers, log<f{esc}ξ_ion > erg–1 Hz = 25.01+0.30–0.19. This implies that faint galaxies beyond the reach of current facilities may have harder radiation fields and/or larger escape fractions than currently detected objects at the end of the reionization epoch.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - intergalactic medium - quasars: absorption lines - dark ages, reionization, first stars

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

CDS comments: Probable misprints: J1148+0702 = J1148+5251, J1148+3549 = J1137+3549.

Simbad objects: 26

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