MUSEQuBES: the relation between Ly alpha emitters and C iv absorbers at z approximate to 3.3

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2023)

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摘要
We present a detailed study of the column density and covering fraction profiles of C IV absorption around 86 redshift z approximate to 3.3 Ly alpha emitters (LAEs) detected in eight Multi-Unit Spectroscopic Explorer (MUSE) fields of 1 arcmin x 1 arcmin centred on eight bright background quasars as part of the MUSE Quasar-field Blind Emitters Survey (MUSEQuBES). Using Voigt profile fitting of all the C IV absorbers detected along these eight sightlines, we generated a 'blind' absorber catalogue consisting of 489 C IV absorption components. We cross-matched this blind C IV catalogue with the MUSE-detected LAE catalogue and found a significant enhancement of C IV components within approximate to +/- 400 km s(-1) of the systemic redshifts of the LAEs. Neither the C IV column density (N) nor the Doppler parameter (b) of individual C IV components shows any significant anticorrelation with impact parameter (rho) of the LAEs in the 68 percentile range of 90 <= rho <= 230 physical kpc (pkpc). We find a covering fraction of approximate to 60 per cent for a threshold N(C iv) of 10(12.5) cm(-2), which is roughly twice as high as in random regions. The C IV covering fraction remains constant at approximate to 50 per cent for impact parameters in the range of 150-250 pkpc (approximate to 3-6R(200)). Using the covering fraction profile, we constrain the LAE-C IV absorber two-point correlation function, and obtain r(0) = 3.4(-1.0)(+1.1) comoving Mpc and.= 1.2(-0.3)(+0.2) for a threshold N(Civ) of 10(13.0) cm(-2). The C IV covering fraction is found to be enhanced for the LAEs that are part of a 'pair/group' compared to the isolated ones.
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关键词
galaxies, haloes - galaxies, high-redshift - intergalactic medium - quasars, absorption lines
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