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Title:
On the connection between the metal-enriched intergalactic medium and galaxies: an O VI-galaxy cross-correlation study at z < 1
Authors:
Finn, Charles W.; Morris, Simon L.; Tejos, Nicolas; Crighton, Neil H. M.; Perry, Robert; Fumagalli, Michele; Bielby, Rich; Theuns, Tom; Schaye, Joop; Shanks, Tom; Liske, Jochen; Gunawardhana, Madusha L. P.; Bartle, Stephanie
Affiliation:
AA(Department of Physics, Durham University, South Road, Durham DH1 3LE, UK; Department of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK ), AB(Department of Physics, Durham University, South Road, Durham DH1 3LE, UK), AC(University of California Observatories-Lick Observatory, University of California, Santa Cruz, CA 95064, USA), AD(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, VIC 3122, Australia), AE(Department of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK), AF(Department of Physics, Durham University, South Road, Durham DH1 3LE, UK; Department of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK), AG(Department of Physics, Durham University, South Road, Durham DH1 3LE, UK), AH(Department of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK), AI(Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA Leiden, the Netherlands), AJ(Department of Physics, Durham University, South Road, Durham DH1 3LE, UK), AK(Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany), AL(Department of Physics, Durham University, South Road, Durham DH1 3LE, UK; Department of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE, UK), AM(Department of Physics, Durham University, South Road, Durham DH1 3LE, UK)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 460, Issue 1, p.590-616 (MNRAS Homepage)
Publication Date:
07/2016
Origin:
OUP
Astronomy Keywords:
galaxies: formation, intergalactic medium, quasars: absorption lines, large-scale structure of Universe
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw918
Bibliographic Code:
2016MNRAS.460..590F

Abstract

We present new results on the auto- and cross-correlation functions of galaxies and O VI absorbers in a ˜18 Gpc3 comoving volume at z < 1. We use a sample of 51 296 galaxies and 140 O VI absorbers in the column density range 13 ≲ log N ≲ 15 to measure two-point correlation functions in the two dimensions transverse and orthogonal to the line of sight xi(r, r||). We furthermore infer the corresponding `real-space' correlation functions, xi(r), by projecting xi(r, r||) along r||, and assuming a power-law form, xi(r) = (r/r0)-gamma. Comparing the results from the absorber-galaxy cross-correlation function, xiag, the galaxy autocorrelation function, xigg, and the absorber autocorrelation function, xiaa, we constrain the statistical connection between galaxies and the metal-enriched intergalactic medium as a function of star formation activity. We also compare these results to predictions from the EAGLE cosmological hydrodynamical simulation and find a reasonable agreement. We find that: (i) O VI absorbers show very little velocity dispersion with respect to galaxies on ˜ Mpc scales, likely ≲100 km s-1; (ii) O VI absorbers are less clustered, and potentially more extended around galaxies than galaxies are around themselves; (iii) on ≳100 kpc scales, the likelihood of finding O VI absorbers around star-forming galaxies is similar to the likelihood of finding O VI absorbers around non-star-forming galaxies; and (iv) O VI absorbers are either not ubiquitous to galaxies in our sample, or their distribution around them is patchy on scales ≳100 kpc (or both), at least for the column densities at which most are currently detected.
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