MUSEQuBES: The relation between Ly$\alpha$ emitters and C IV absorbers at $z\approx 3.3$

Abstract

We present a detailed study of the column density and covering fraction profiles of C IV absorption around 86 redshift $z\approx 3.3$ Ly$\alpha$ emitters (LAEs) detected in 8 Multi-Unit Spectroscopic Explorer (MUSE) fields of $1^{\prime }\times 1^{\prime }$ centered on 8 bright background quasars as part of the MUSEQuBES survey. Using Voigt profile fitting of all the C IV absorbers detected along these 8 sightlines, we generated a ``blind'' absorbers' catalog consisting of 489 C IV absorption components. We cross-matched this blind C IV catalog with the MUSE-detected LAE catalog and found a significant enhancement of C IV components within $\approx \pm$400 $\mathrm{km}{\mathrm{s}}^{-1}$ 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 anti-correlation with impact parameter ($\rho$) of the LAEs in the 68 percentile range of $90\le \rho \le 230$ physical kpc (pkpc). We find a covering fraction of $\approx 60\%$ for a threshold $N$(C IV) of $10^{12.5}\mathrm{c}{\mathrm{m}}^{-2}$, which is roughly twice as high as in random regions. The C IV covering fraction remains constant at $\approx 50\%$ for impact parameters in the range 150--250~pkpc ($\approx 3-6R_{200}$). Using the covering fraction profile, we constrained the LAE--C IV absorber two-point correlation function, and obtained $r_0=3.4$ comoving Mpc (cMpc) and $\gamma =1.2$ for a threshold $N$(C IV) of $10^{13.0}\mathrm{c}{\mathrm{m}}^{-2}$. 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.

19 (+15 in the appendix) pages, 15 (+2 in the appendix) figures. Accepted for publication in MNRAS

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