Header

UZH-Logo

Maintenance Infos

The baryonic mass-velocity relation: clues to feedback processes during structure formation and the cosmic baryon inventory


Mayer, Lucio; Moore, Ben (2004). The baryonic mass-velocity relation: clues to feedback processes during structure formation and the cosmic baryon inventory. Monthly Notices of the Royal Astronomical Society, 354(2):477-484.

Abstract

We show that a global relation between baryonic mass and virial velocity can be constructed from the scale of dwarf galaxies up to that of rich galaxy clusters. The slope of this relation is close to that expected if dark matter haloes form in the standard hierarchical cosmogony and capture a universal baryon fraction, once the details of halo structure and the adiabatic contraction of haloes due to cooling gas are taken into account. The scatter and deficiency of baryons within low‐mass haloes (Vvir < 50 km s−1) are consistent with the expected suppression of gas accretion by photoevaporation due to the cosmic UV background at high redshift. The data are not consistent with significant gas removal from strong supernovae winds unless the velocities of galaxies measured from their gas kinematics are significantly lower than the true halo velocities for objects with Vvir < 100 km s−1. Thus models such as Λ cold dark matter (ΛCDM) with a steep mass function of haloes may find it difficult to reproduce the baryonic mass-velocity relation presented here whilst at the same time reproducing the flat luminosity/H i function of galaxies. Galaxies hold about 10 per cent of the baryons in the Universe, which is close to the collapsed mass fraction expected within hierarchical models on these scales, suggesting a high efficiency for galaxy formation. Most of the baryons are expected to be evenly distributed between diffuse intergalactic gas in low‐density environments and the intragalactic medium within galaxy groups

Abstract

We show that a global relation between baryonic mass and virial velocity can be constructed from the scale of dwarf galaxies up to that of rich galaxy clusters. The slope of this relation is close to that expected if dark matter haloes form in the standard hierarchical cosmogony and capture a universal baryon fraction, once the details of halo structure and the adiabatic contraction of haloes due to cooling gas are taken into account. The scatter and deficiency of baryons within low‐mass haloes (Vvir < 50 km s−1) are consistent with the expected suppression of gas accretion by photoevaporation due to the cosmic UV background at high redshift. The data are not consistent with significant gas removal from strong supernovae winds unless the velocities of galaxies measured from their gas kinematics are significantly lower than the true halo velocities for objects with Vvir < 100 km s−1. Thus models such as Λ cold dark matter (ΛCDM) with a steep mass function of haloes may find it difficult to reproduce the baryonic mass-velocity relation presented here whilst at the same time reproducing the flat luminosity/H i function of galaxies. Galaxies hold about 10 per cent of the baryons in the Universe, which is close to the collapsed mass fraction expected within hierarchical models on these scales, suggesting a high efficiency for galaxy formation. Most of the baryons are expected to be evenly distributed between diffuse intergalactic gas in low‐density environments and the intragalactic medium within galaxy groups

Statistics

Citations

Dimensions.ai Metrics
19 citations in Web of Science®
19 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

13 downloads since deposited on 19 Oct 2018
8 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Astronomy and Astrophysics
Physical Sciences > Space and Planetary Science
Language:English
Date:1 October 2004
Deposited On:19 Oct 2018 07:55
Last Modified:31 Jul 2020 02:30
Publisher:Oxford University Press
ISSN:0035-8711
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1111/j.1365-2966.2004.08203.x
Related URLs:https://www.swissbib.ch/Search/Results?lookfor=nationallicenceoxford101111j13652966200408203x (Library Catalogue)

Download

Hybrid Open Access

Download PDF  'The baryonic mass-velocity relation: clues to feedback processes during structure formation and the cosmic baryon inventory'.
Preview
Content: Published Version
Language: English
Filetype: PDF (Nationallizenz 142-005)
Size: 172kB
View at publisher