TY - JOUR
T1 - The relationship between gas and galaxies at z < 1 using the Q0107 quasar triplet
AU - Beckett, Alexander
AU - Morris, Simon L.
AU - Fumagalli, Michele
AU - Bielby, Rich
AU - Tejos, Nicolas
AU - Schaye, Joop
AU - Jannuzi, Buell
AU - Cantalupo, Sebastiano
N1 - Funding Information:
We thank the referee for useful comments that have improved the quality of this paper. This work is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute (STScI). STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contractNAS 5-26555.We also make use of observations collected at the European Southern Observatory under ESO programmes 086.A- 0970, 087.A-0857, and 094.A-0131; at the W.M. Keck Observatory under programme A290D; and at the Gemini Observatory under programme GS-2008B-Q-50. We thank Matteo Fossati for providing the MARZ templates used for estimating redshifts and their uncertainties. We also thank Jill Bechtold for leading the effort to obtain the Keck/DEIMOS data. We thank the contributors to SCIPY, 5 MATPLOTLIB, 6 ASTROPY, 7 and the PYTHON programming language, the free and open-source community and the NASA Astrophysics Data system8 for software and services. AB acknowledges the support of a UK Science and Technology Facilities Council (STFC) PhD studentship through grant ST/S505365/1. SLM acknowledges the support of STFC grant ST/T000244/1. SC gratefully acknowledges support from Swiss National Science Foundation grants PP00P2 163824 and PP00P2 190092, and from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme grant agreement No. 864361. MF also acknowledges funding from the ERC under the Horizon 2020 programme (grant agreement No. 757535). This work has been supported by Fondazione Cariplo, grant No. 2018-2329. This work also made use of the DiRAC system at Durham University, operated by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility.9 The equipment was funded by BEIS capital funding via STFC capital grants ST/P002293/1, ST/R002371/1 and ST/S002502/1, Durham University and STFC operations grant ST/R000832/1. DiRAC is part of the National e- Infrastructure.
Publisher Copyright:
© 2021 The Author(s) Published by Oxford University Press on behalf of The Royal Astronomical Society.
PY - 2021/9/1
Y1 - 2021/9/1
N2 - 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.
AB - 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.
KW - Galaxies: formation
KW - Intergalactic medium
KW - Large-scale structure of Universe
KW - Quasars: absorption lines
UR - http://www.scopus.com/inward/record.url?scp=85112258213&partnerID=8YFLogxK
U2 - 10.1093/mnras/stab1630
DO - 10.1093/mnras/stab1630
M3 - Article
AN - SCOPUS:85112258213
VL - 506
SP - 2574
EP - 2602
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -