Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

On the connection between the metal-enriched intergalactic medium and galaxies : an O VI–galaxy cross-correlation study at z < 1.

Finn, C. W. and Morris, S. L. and Tejos, N. and Crighton, N. H. M. and Perry, R. and Fumagalli, M. and Bielby, R. and Theuns, T. and Schaye, J. and Shanks, T. and Liske, J. and Gunawardhana, M. L. P. and Bartle, S. (2016) 'On the connection between the metal-enriched intergalactic medium and galaxies : an O VI–galaxy cross-correlation study at z < 1.', Monthly notices of the Royal Astronomical Society., 460 (1). pp. 590-616.

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 ξ(r⊥, r∥). We furthermore infer the corresponding ‘real-space’ correlation functions, ξ(r), by projecting ξ(r⊥, r∥) along r∥, and assuming a power-law form, ξ(r) = (r/r0)−γ. Comparing the results from the absorber-galaxy cross-correlation function, ξag, the galaxy autocorrelation function, ξgg, and the absorber autocorrelation function, ξaa, 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.

Item Type:Article
Full text:(VoR) Version of Record
Download PDF
(3555Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/mnras/stw918
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:18 April 2016
Date deposited:31 May 2016
Date of first online publication:21 April 2016
Date first made open access:31 May 2016

Save or Share this output

Export:
Export
Look up in GoogleScholar