Discovery of a damped Ly$α$ galaxy at z $sim$ 3 towards the quasar SDSS J011852+040644

Kavli Affiliate: Linhua Jiang

| First 5 Authors: Ravi Joshi, Michele Fumagalli, Raghunathan Srianand, Pasquier Noterdaeme, Patrick Petitjean

| Summary:

We report the detection of the host galaxy of a damped Ly$alpha$ system
(DLA) with log N(HI) $ [rm cm^{-2}]$ = $21.0 pm 0.10$ at $z approx 3.0091$
towards the background quasar SDSS J011852+040644 using the Palomar Cosmic Web
Imager (PCWI) at the Hale (P200) telescope. We detect Ly$alpha$ emission in
the dark core of the DLA trough at a 3.3$sigma$ confidence level, with
Ly$alpha$ luminosity of $L_{rm Lyalpha}$ $rm = (3.8 pm 0.8) times
10^{42} erg s^{-1}$, corresponding to a star formation rate of $gtrsim 2
rm M_{odot} yr^{-1}$ (considering a lower limit on Ly$alpha$ escape
fraction $f_{esc}^{Ly{alpha}} sim 2%$) as typical for Lyman break galaxies
at these redshifts. The Ly$alpha$ emission is blueshifted with respect to the
systemic redshift derived from metal absorption lines by $281 pm 43$ km/s. The
associated galaxy is at very small impact parameter of $lesssim 12 rm kpc$
from the background quasar, which is in line with the observed anticorrelation
between column density and impact parameter in spectroscopic searches tracing
the large-scale environments of DLA host galaxies.

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