Misc,
Faint LAEs near z>4.7 CIV absorbers revealed by MUSE
(2020)cite arxiv:2001.04453Comment: 21 pages, 23 figures, 3 tables. Submitted to MNRAS.
Abstract
We present the results from the search for Lyman Alpha emitters (LAEs) in the
proximity of 11 CIV absorption systems at $z > 4.7$ in the spectrum of the QSO
J1030+0524, using data from MUSE. We have found multiple LAE candidates close
to four CIV systems at $z_CIV = 4.94$-5.74 with log$_10$(N CIVcm$^-2$)$
> 13.5.$ At z = 5-6, CIV systems with W0(CIV) $> 0.2$ \AA seem more likely to
have galaxies with Ly$\alpha$ emission within $< 200$ proper kpc (4/5
cases), than the CIV systems with W0(CIV)$ < 0.2$ \AA (0/6 cases). The impact
parameter of LAE-CIV systems with equivalent widths W0(CIV)$ > 0.5 $ \AA is
in the range 11 $ < <$ 200 proper kpc (pkpc). Furthermore, all candidates
are in the luminosity range 0.18-1.15 L*$(Ly , z = 5.7)$ indicating
that the environment of CIV systems within 200 pkpc is populated by the faint
end of the Ly$\alpha$ luminosity function. We report a 0.28 L*$(Ly\alpha)$
galaxy at a separation of $= 10$ pkpc from a strong CIV absorption
(log10(NCIVcm$^-2$) = 14.52) at $z_CIV = 5.72419$. The prevalence of
sub-L*(Ly$\alpha$) galaxies in the proximity of z $> 4.9$ CIV systems suggest
that the absorbing material is rather young, likely ejected in the recent past
of the galaxies at these redshifts. The connection between faint LAEs and
high-ionization absorption systems reported in this work, is potentially a
consequence of the role of low mass galaxies in the early evolution of the
circum-galactic and intergalactic media.
