On the connection between the intergalactic medium and galaxies

The hi-galaxy cross-correlation at z < 1*

Nicolas Tejos, Simon L. Morris, Charles W. Finn, Neil H M Crighton, Jill Bechtold, Buell Tomasson Jannuzi, Joop Schaye, Tom Theuns, Gabriel Altay, Olivier Le Fèvre, Emma Ryan-Weber, Romeel S Dave

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We present a new optical spectroscopic survey of 1777 'star-forming' ('SF') and 366 'non-starforming' ('non-SF') galaxies at redshifts z ~ 0-1 (2143 in total), 22 AGN and 423 stars, observed by instruments such as the Deep Imaging Multi-Object Spectrograph, the Visible Multi- Object Spectrograph and the GeminiMulti-Object Spectrograph, in three fields containing five quasi-stellar objects (QSOs) with Hubble Space Telescope (HST) ultraviolet spectroscopy.We also present a new spectroscopic survey of 173 'strong' (1014 < NHI < 1017 cm-2) and 496 'weak' (1013 < NHI ≤ 1014 cm-2) intervening HI (Lyα) absorption-line systems at z < 1 (669 in total), observed in the spectra of eight QSOs at z ~ 1 by the Cosmic Origins Spectrograph and the Faint Object Spectrograph on the HST. Combining these new data with previously published galaxy catalogues such as the Very Large Telescope Visible Multi-Object Spectrograph Deep Survey and the Gemini Deep Deep Survey, we have gathered a sample of 654 HI absorption systems and 17 509 galaxies at transverse scales ≤50 Mpc, suitable for a two-point correlation function analysis. We present observational results on the HI-galaxy (ξgg) and galaxy-galaxy (ξ;gg) correlations at transverse scales r ≤ 10 Mpc, and the HI-H I autocorrelation (ξ;gg) at transverse scales r ≤ 2Mpc. The two-point correlation functions are measured both along and transverse to the line of sight, ξ (r, r). We also infer the shape of their corresponding 'real-space' correlation functions, ξ (r), from the projected along the line-of-sight correlations, assuming power laws of the form ξ (r)=(r/r0)-γ; . Comparing the results from ξag, ξgg and ξa, we constrain the HI-galaxy statistical connection, as a function of both HI column density and galaxy star formation activity. Our results are consistent with the following conclusions: (i) the bulk of HI systems on ~Mpc scales have little velocity dispersion (≤120 km s-1) with respect to the bulk of galaxies (i.e. no strong galaxy outflow/inflow signal is detected); (ii) the vast majority (~100 per cent) of 'strong' HI systems and 'SF' galaxies are distributed in the same locations, together with 75 ± 15 per cent of 'non-SF' galaxies, all of which typically reside in dark matter haloes of similar masses; (iii) 25 ± 15 per cent of 'non-SF' galaxies reside in galaxy clusters and are not correlated with 'strong' HI systems at scales <2Mpc; and (iv) ≥50 per cent of 'weak' HI systems reside within galaxy voids (hence not correlated with galaxies), and are confined in dark matter haloes of masses smaller than those hosting 'strong' systems and/or galaxies. We speculate that HI systems within galaxy voids might still be evolving in the linear regime even at scales <2Mpc.

Original languageEnglish (US)
Pages (from-to)2017-2075
Number of pages59
JournalMonthly Notices of the Royal Astronomical Society
Volume437
Issue number3
DOIs
StatePublished - Jan 2014

Fingerprint

intergalactic media
cross correlation
galaxies
void
spectrographs
autocorrelation
power law
inflow
outflow
spectroscopy
Hubble Space Telescope
line of sight
voids
halos
dark matter
faint objects
stars
ultraviolet spectroscopy

Keywords

  • Absorption lines-largescale structure of Universe
  • Formation-intergalactic medium-quasars
  • Galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

On the connection between the intergalactic medium and galaxies : The hi-galaxy cross-correlation at z < 1*. / Tejos, Nicolas; Morris, Simon L.; Finn, Charles W.; Crighton, Neil H M; Bechtold, Jill; Jannuzi, Buell Tomasson; Schaye, Joop; Theuns, Tom; Altay, Gabriel; Fèvre, Olivier Le; Ryan-Weber, Emma; Dave, Romeel S.

In: Monthly Notices of the Royal Astronomical Society, Vol. 437, No. 3, 01.2014, p. 2017-2075.

Research output: Contribution to journalArticle

Tejos, Nicolas ; Morris, Simon L. ; Finn, Charles W. ; Crighton, Neil H M ; Bechtold, Jill ; Jannuzi, Buell Tomasson ; Schaye, Joop ; Theuns, Tom ; Altay, Gabriel ; Fèvre, Olivier Le ; Ryan-Weber, Emma ; Dave, Romeel S. / On the connection between the intergalactic medium and galaxies : The hi-galaxy cross-correlation at z < 1*. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 437, No. 3. pp. 2017-2075.
@article{9083d64c6d46416aa26179bac5247300,
title = "On the connection between the intergalactic medium and galaxies: The hi-galaxy cross-correlation at z < 1*",
abstract = "We present a new optical spectroscopic survey of 1777 'star-forming' ('SF') and 366 'non-starforming' ('non-SF') galaxies at redshifts z ~ 0-1 (2143 in total), 22 AGN and 423 stars, observed by instruments such as the Deep Imaging Multi-Object Spectrograph, the Visible Multi- Object Spectrograph and the GeminiMulti-Object Spectrograph, in three fields containing five quasi-stellar objects (QSOs) with Hubble Space Telescope (HST) ultraviolet spectroscopy.We also present a new spectroscopic survey of 173 'strong' (1014 < NHI < 1017 cm-2) and 496 'weak' (1013 < NHI ≤ 1014 cm-2) intervening HI (Lyα) absorption-line systems at z < 1 (669 in total), observed in the spectra of eight QSOs at z ~ 1 by the Cosmic Origins Spectrograph and the Faint Object Spectrograph on the HST. Combining these new data with previously published galaxy catalogues such as the Very Large Telescope Visible Multi-Object Spectrograph Deep Survey and the Gemini Deep Deep Survey, we have gathered a sample of 654 HI absorption systems and 17 509 galaxies at transverse scales ≤50 Mpc, suitable for a two-point correlation function analysis. We present observational results on the HI-galaxy (ξgg) and galaxy-galaxy (ξ;gg) correlations at transverse scales r⊥ ≤ 10 Mpc, and the HI-H I autocorrelation (ξ;gg) at transverse scales r⊥ ≤ 2Mpc. The two-point correlation functions are measured both along and transverse to the line of sight, ξ (r⊥, r). We also infer the shape of their corresponding 'real-space' correlation functions, ξ (r), from the projected along the line-of-sight correlations, assuming power laws of the form ξ (r)=(r/r0)-γ; . Comparing the results from ξag, ξgg and ξa, we constrain the HI-galaxy statistical connection, as a function of both HI column density and galaxy star formation activity. Our results are consistent with the following conclusions: (i) the bulk of HI systems on ~Mpc scales have little velocity dispersion (≤120 km s-1) with respect to the bulk of galaxies (i.e. no strong galaxy outflow/inflow signal is detected); (ii) the vast majority (~100 per cent) of 'strong' HI systems and 'SF' galaxies are distributed in the same locations, together with 75 ± 15 per cent of 'non-SF' galaxies, all of which typically reside in dark matter haloes of similar masses; (iii) 25 ± 15 per cent of 'non-SF' galaxies reside in galaxy clusters and are not correlated with 'strong' HI systems at scales <2Mpc; and (iv) ≥50 per cent of 'weak' HI systems reside within galaxy voids (hence not correlated with galaxies), and are confined in dark matter haloes of masses smaller than those hosting 'strong' systems and/or galaxies. We speculate that HI systems within galaxy voids might still be evolving in the linear regime even at scales <2Mpc.",
keywords = "Absorption lines-largescale structure of Universe, Formation-intergalactic medium-quasars, Galaxies",
author = "Nicolas Tejos and Morris, {Simon L.} and Finn, {Charles W.} and Crighton, {Neil H M} and Jill Bechtold and Jannuzi, {Buell Tomasson} and Joop Schaye and Tom Theuns and Gabriel Altay and F{\`e}vre, {Olivier Le} and Emma Ryan-Weber and Dave, {Romeel S}",
year = "2014",
month = "1",
doi = "10.1093/mnras/stt1844",
language = "English (US)",
volume = "437",
pages = "2017--2075",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",

}

TY - JOUR

T1 - On the connection between the intergalactic medium and galaxies

T2 - The hi-galaxy cross-correlation at z < 1*

AU - Tejos, Nicolas

AU - Morris, Simon L.

AU - Finn, Charles W.

AU - Crighton, Neil H M

AU - Bechtold, Jill

AU - Jannuzi, Buell Tomasson

AU - Schaye, Joop

AU - Theuns, Tom

AU - Altay, Gabriel

AU - Fèvre, Olivier Le

AU - Ryan-Weber, Emma

AU - Dave, Romeel S

PY - 2014/1

Y1 - 2014/1

N2 - We present a new optical spectroscopic survey of 1777 'star-forming' ('SF') and 366 'non-starforming' ('non-SF') galaxies at redshifts z ~ 0-1 (2143 in total), 22 AGN and 423 stars, observed by instruments such as the Deep Imaging Multi-Object Spectrograph, the Visible Multi- Object Spectrograph and the GeminiMulti-Object Spectrograph, in three fields containing five quasi-stellar objects (QSOs) with Hubble Space Telescope (HST) ultraviolet spectroscopy.We also present a new spectroscopic survey of 173 'strong' (1014 < NHI < 1017 cm-2) and 496 'weak' (1013 < NHI ≤ 1014 cm-2) intervening HI (Lyα) absorption-line systems at z < 1 (669 in total), observed in the spectra of eight QSOs at z ~ 1 by the Cosmic Origins Spectrograph and the Faint Object Spectrograph on the HST. Combining these new data with previously published galaxy catalogues such as the Very Large Telescope Visible Multi-Object Spectrograph Deep Survey and the Gemini Deep Deep Survey, we have gathered a sample of 654 HI absorption systems and 17 509 galaxies at transverse scales ≤50 Mpc, suitable for a two-point correlation function analysis. We present observational results on the HI-galaxy (ξgg) and galaxy-galaxy (ξ;gg) correlations at transverse scales r⊥ ≤ 10 Mpc, and the HI-H I autocorrelation (ξ;gg) at transverse scales r⊥ ≤ 2Mpc. The two-point correlation functions are measured both along and transverse to the line of sight, ξ (r⊥, r). We also infer the shape of their corresponding 'real-space' correlation functions, ξ (r), from the projected along the line-of-sight correlations, assuming power laws of the form ξ (r)=(r/r0)-γ; . Comparing the results from ξag, ξgg and ξa, we constrain the HI-galaxy statistical connection, as a function of both HI column density and galaxy star formation activity. Our results are consistent with the following conclusions: (i) the bulk of HI systems on ~Mpc scales have little velocity dispersion (≤120 km s-1) with respect to the bulk of galaxies (i.e. no strong galaxy outflow/inflow signal is detected); (ii) the vast majority (~100 per cent) of 'strong' HI systems and 'SF' galaxies are distributed in the same locations, together with 75 ± 15 per cent of 'non-SF' galaxies, all of which typically reside in dark matter haloes of similar masses; (iii) 25 ± 15 per cent of 'non-SF' galaxies reside in galaxy clusters and are not correlated with 'strong' HI systems at scales <2Mpc; and (iv) ≥50 per cent of 'weak' HI systems reside within galaxy voids (hence not correlated with galaxies), and are confined in dark matter haloes of masses smaller than those hosting 'strong' systems and/or galaxies. We speculate that HI systems within galaxy voids might still be evolving in the linear regime even at scales <2Mpc.

AB - We present a new optical spectroscopic survey of 1777 'star-forming' ('SF') and 366 'non-starforming' ('non-SF') galaxies at redshifts z ~ 0-1 (2143 in total), 22 AGN and 423 stars, observed by instruments such as the Deep Imaging Multi-Object Spectrograph, the Visible Multi- Object Spectrograph and the GeminiMulti-Object Spectrograph, in three fields containing five quasi-stellar objects (QSOs) with Hubble Space Telescope (HST) ultraviolet spectroscopy.We also present a new spectroscopic survey of 173 'strong' (1014 < NHI < 1017 cm-2) and 496 'weak' (1013 < NHI ≤ 1014 cm-2) intervening HI (Lyα) absorption-line systems at z < 1 (669 in total), observed in the spectra of eight QSOs at z ~ 1 by the Cosmic Origins Spectrograph and the Faint Object Spectrograph on the HST. Combining these new data with previously published galaxy catalogues such as the Very Large Telescope Visible Multi-Object Spectrograph Deep Survey and the Gemini Deep Deep Survey, we have gathered a sample of 654 HI absorption systems and 17 509 galaxies at transverse scales ≤50 Mpc, suitable for a two-point correlation function analysis. We present observational results on the HI-galaxy (ξgg) and galaxy-galaxy (ξ;gg) correlations at transverse scales r⊥ ≤ 10 Mpc, and the HI-H I autocorrelation (ξ;gg) at transverse scales r⊥ ≤ 2Mpc. The two-point correlation functions are measured both along and transverse to the line of sight, ξ (r⊥, r). We also infer the shape of their corresponding 'real-space' correlation functions, ξ (r), from the projected along the line-of-sight correlations, assuming power laws of the form ξ (r)=(r/r0)-γ; . Comparing the results from ξag, ξgg and ξa, we constrain the HI-galaxy statistical connection, as a function of both HI column density and galaxy star formation activity. Our results are consistent with the following conclusions: (i) the bulk of HI systems on ~Mpc scales have little velocity dispersion (≤120 km s-1) with respect to the bulk of galaxies (i.e. no strong galaxy outflow/inflow signal is detected); (ii) the vast majority (~100 per cent) of 'strong' HI systems and 'SF' galaxies are distributed in the same locations, together with 75 ± 15 per cent of 'non-SF' galaxies, all of which typically reside in dark matter haloes of similar masses; (iii) 25 ± 15 per cent of 'non-SF' galaxies reside in galaxy clusters and are not correlated with 'strong' HI systems at scales <2Mpc; and (iv) ≥50 per cent of 'weak' HI systems reside within galaxy voids (hence not correlated with galaxies), and are confined in dark matter haloes of masses smaller than those hosting 'strong' systems and/or galaxies. We speculate that HI systems within galaxy voids might still be evolving in the linear regime even at scales <2Mpc.

KW - Absorption lines-largescale structure of Universe

KW - Formation-intergalactic medium-quasars

KW - Galaxies

UR - http://www.scopus.com/inward/record.url?scp=84891362663&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84891362663&partnerID=8YFLogxK

U2 - 10.1093/mnras/stt1844

DO - 10.1093/mnras/stt1844

M3 - Article

VL - 437

SP - 2017

EP - 2075

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -