We study the distribution and dynamics of the circumgalactic and intergalactic medium using a dense galaxy survey covering the field around the Q0107 system, a unique z ≈ 1 projected quasar triplet. With full Ly α coverage along all three lines-of-sight from z = 0.18 to z = 0.73, more than 1200 galaxy spectra, and two MUSE fields, we examine the structure of the gas around galaxies on 100-1000 kpc scales. We search for H i absorption systems occurring at the same redshift (within 500 km s-1) in multiple sightlines, finding with >99.9 per cent significance that these systems are more frequent in the observed quasar spectra than in a randomly distributed population of absorbers. This is driven primarily by absorption with column densities N(H i) > 1014 cm-2, whilst multi-sightline absorbers with lower column densities are consistent with a random distribution. Star-forming galaxies are more likely to be associated with multi-sightline absorption than quiescent galaxies. HST imaging provides inclinations and position angles for a subset of these galaxies. We observe a bimodality in the position angle of detected galaxy-absorber pairs, again driven mostly by high-column-density absorbers, with absorption preferentially along the major and minor axes of galaxies out to impact parameters of several hundred kpc. We find some evidence supporting a disc/outflow dichotomy, as H i absorbers near the projected major axis of a galaxy show line-of-sight velocities that tend to align with the rotation of that galaxy, whilst minor-axis absorbers are twice as likely to exhibit O vi at the same redshift.

Beckett, A., Morris, S., Fumagalli, M., Bielby, R., Tejos, N., Schaye, J., et al. (2021). The relationship between gas and galaxies at z < 1 using the Q0107 quasar triplet. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 506(2), 2574-2602 [10.1093/mnras/stab1630].

The relationship between gas and galaxies at z < 1 using the Q0107 quasar triplet

Fumagalli M.;Cantalupo S.
2021

Abstract

We study the distribution and dynamics of the circumgalactic and intergalactic medium using a dense galaxy survey covering the field around the Q0107 system, a unique z ≈ 1 projected quasar triplet. With full Ly α coverage along all three lines-of-sight from z = 0.18 to z = 0.73, more than 1200 galaxy spectra, and two MUSE fields, we examine the structure of the gas around galaxies on 100-1000 kpc scales. We search for H i absorption systems occurring at the same redshift (within 500 km s-1) in multiple sightlines, finding with >99.9 per cent significance that these systems are more frequent in the observed quasar spectra than in a randomly distributed population of absorbers. This is driven primarily by absorption with column densities N(H i) > 1014 cm-2, whilst multi-sightline absorbers with lower column densities are consistent with a random distribution. Star-forming galaxies are more likely to be associated with multi-sightline absorption than quiescent galaxies. HST imaging provides inclinations and position angles for a subset of these galaxies. We observe a bimodality in the position angle of detected galaxy-absorber pairs, again driven mostly by high-column-density absorbers, with absorption preferentially along the major and minor axes of galaxies out to impact parameters of several hundred kpc. We find some evidence supporting a disc/outflow dichotomy, as H i absorbers near the projected major axis of a galaxy show line-of-sight velocities that tend to align with the rotation of that galaxy, whilst minor-axis absorbers are twice as likely to exhibit O vi at the same redshift.
Si
Articolo in rivista - Articolo scientifico
Scientifica
Galaxies: formation; Intergalactic medium; Large-scale structure of Universe; Quasars: absorption lines;
English
2574
2602
29
Hybrid Gold Open Access• Green Open Access
Beckett, A., Morris, S., Fumagalli, M., Bielby, R., Tejos, N., Schaye, J., et al. (2021). The relationship between gas and galaxies at z < 1 using the Q0107 quasar triplet. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 506(2), 2574-2602 [10.1093/mnras/stab1630].
Beckett, A; Morris, S; Fumagalli, M; Bielby, R; Tejos, N; Schaye, J; Jannuzi, B; Cantalupo, S
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/335707
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