From lenticulars to blue compact dwarfs : The stellar mass fraction is regulated by disc gravitational instability
(2020) In Monthly Notices of the Royal Astronomical Society 499(4). p.5656-5664- Abstract
The stellar-to-halo mass relation (SHMR) is not only one of the main sources of information we have on the connection between galaxies and their dark matter haloes, but also an important indicator of the performance of galaxy formation models. Here, we use one of the largest sample of galaxies with both high-quality rotation curves and near-infrared surface photometry, and perform a detailed comparative analysis of the SHMR. Our analysis shows that there are significant statistical differences between popular forms of the SHMR, and illustrates the predictive power of a new physically motivated scaling relation, which connects the stellar mass fraction (M·/Mh) to the stellar specific angular momentum (j·) and the stellar radial velocity... (More)
The stellar-to-halo mass relation (SHMR) is not only one of the main sources of information we have on the connection between galaxies and their dark matter haloes, but also an important indicator of the performance of galaxy formation models. Here, we use one of the largest sample of galaxies with both high-quality rotation curves and near-infrared surface photometry, and perform a detailed comparative analysis of the SHMR. Our analysis shows that there are significant statistical differences between popular forms of the SHMR, and illustrates the predictive power of a new physically motivated scaling relation, which connects the stellar mass fraction (M·/Mh) to the stellar specific angular momentum (j·) and the stellar radial velocity dispersion (σ·) via disc gravitational instability. Making use of such a relation, we demonstrate (i) how challenging it is to reproduce the efficiency of galaxy formation even for state-of-the-art cosmological hydrodynamical simulations, and (ii) that the evolution of the stellar mass fraction is regulated by disc gravitational instability: when M·/Mh varies, j· and σ· also vary as predicted by our scaling relation, thus erasing the memory of such evolution. This implies that the process of disc gravitational instability is intriguingly uniform across disc galaxies of all morphological types: from lenticulars to blue compact dwarfs. In particular, the cosmic variance of Toomre's Q is 0.2 dex, a universal value for both stars and atomic gas.
(Less)
- author
- Romeo, Alessandro B. ; Agertz, Oscar LU and Renaud, Florent LU
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- dark matter, galaxies: fundamental parameters, galaxies: haloes, galaxies: kinematics and dynamics, galaxies: stellar content, instabilities
- in
- Monthly Notices of the Royal Astronomical Society
- volume
- 499
- issue
- 4
- pages
- 9 pages
- publisher
- Oxford University Press
- external identifiers
-
- scopus:85096935257
- ISSN
- 0035-8711
- DOI
- 10.1093/mnras/staa3245
- language
- English
- LU publication?
- yes
- id
- b2c72daf-c698-44b9-8253-fc550b98c3f7
- date added to LUP
- 2020-12-10 07:18:09
- date last changed
- 2024-04-03 16:54:51
@article{b2c72daf-c698-44b9-8253-fc550b98c3f7,
abstract = {{<p>The stellar-to-halo mass relation (SHMR) is not only one of the main sources of information we have on the connection between galaxies and their dark matter haloes, but also an important indicator of the performance of galaxy formation models. Here, we use one of the largest sample of galaxies with both high-quality rotation curves and near-infrared surface photometry, and perform a detailed comparative analysis of the SHMR. Our analysis shows that there are significant statistical differences between popular forms of the SHMR, and illustrates the predictive power of a new physically motivated scaling relation, which connects the stellar mass fraction (M·/Mh) to the stellar specific angular momentum (j·) and the stellar radial velocity dispersion (σ·) via disc gravitational instability. Making use of such a relation, we demonstrate (i) how challenging it is to reproduce the efficiency of galaxy formation even for state-of-the-art cosmological hydrodynamical simulations, and (ii) that the evolution of the stellar mass fraction is regulated by disc gravitational instability: when M·/Mh varies, j· and σ· also vary as predicted by our scaling relation, thus erasing the memory of such evolution. This implies that the process of disc gravitational instability is intriguingly uniform across disc galaxies of all morphological types: from lenticulars to blue compact dwarfs. In particular, the cosmic variance of Toomre's Q is 0.2 dex, a universal value for both stars and atomic gas.</p>}},
author = {{Romeo, Alessandro B. and Agertz, Oscar and Renaud, Florent}},
issn = {{0035-8711}},
keywords = {{dark matter; galaxies: fundamental parameters; galaxies: haloes; galaxies: kinematics and dynamics; galaxies: stellar content; instabilities}},
language = {{eng}},
number = {{4}},
pages = {{5656--5664}},
publisher = {{Oxford University Press}},
series = {{Monthly Notices of the Royal Astronomical Society}},
title = {{From lenticulars to blue compact dwarfs : The stellar mass fraction is regulated by disc gravitational instability}},
url = {{http://dx.doi.org/10.1093/mnras/staa3245}},
doi = {{10.1093/mnras/staa3245}},
volume = {{499}},
year = {{2020}},
}