Publication Date:
2016-04-07
Description:
Using the Low Dispersion Survey Spectrograph 3 at the Magellan II Clay Telescope, we target candidate absorption host galaxies detected in deep optical imaging (reaching limiting apparent magnitudes of 23.0–26.5 in g , r , i , and z filters) in the fields of three QSOs, each of which shows the presence of high metallicity, high $N_{\rm H\,\small {i}}$ absorption systems in their spectra (Q0826-2230: z abs = 0.9110, Q1323-0021: z abs = 0.7160, Q1436-0051: z abs = 0.7377, 0.9281). We confirm three host galaxies at redshifts 0.7387, 0.7401, and 0.9286 for two of the Lyman α absorption systems (one with two galaxies interacting). For these systems, we are able to determine the star formation rates (SFRs); impact parameters (from previous imaging detections); the velocity shift between the absorption and emission redshifts; and, for one system, also the emission metallicity. Based on previous photometry, we find these galaxies have L 〉 L *. The [O ii ] SFRs for these galaxies are in the range 11–25 M yr –1 (uncorrected for dust), while the impact parameters lie in the range 35–54 kpc. Despite the fact that we have confirmed galaxies at 50 kpc from the QSO, no gradient in metallicity is indicated between the absorption metallicity along the QSO line of sight and the emission line metallicity in the galaxies. We confirm the anticorrelation between impact parameter and $N_{\rm H\,\small {i}}$ from the literature. We also report the emission redshift of five other galaxies: three at z em 〉 z QSO , and two ( L 〈 L *) at z em 〈 z QSO not corresponding to any known absorption systems.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
