|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The cosmic evolution of the stellar mass-velocity dispersion relation of early-type galaxies | | Carlo Cannarozzo
; Alessandro Sonnenfeld
; Carlo Nipoti
; | | Date: |
15 Oct 2019 | | Abstract: | Taking advantage of a Bayesian hierarchical inference formalism, we study the
evolution of the observed correlation between central stellar velocity
dispersion $sigma_0$ and stellar mass $M_*$ of massive ($M_*gtrsim
10^{10.5},mathrm{M_odot}$) early-type galaxies (ETGs) out to redshift
$zapprox 2.5$. Collecting ETGs from state-of-the-art literature samples, we
consider both a fiducial ($0lesssim zlesssim 1.2$) and an extended
($0lesssim zlesssim 2.5$) samples. Based on the fiducial sample, we find that
at $zlesssim 1.2$ the $M_*-sigma_0$ relation is well represented by
$sigma_0propto M_*^{eta}(1+z)^{zeta}$, with $etasimeq 0.23$ (at given
$z$, $sigma_0$ increases with $M_*$ as a power law with slope similar to the
classical Faber-Jackson relation) and $zetasimeq 0.26$ (at given $M_*$,
$sigma_0$ decreases for decreasing $z$, for instance by $simeq 20\%$ from
$z=1$ to $z=0$). The analysis of the extended sample suggests that over the
wider redshift range $0lesssim zlesssim 2.5$ the slope $eta$ could be
slightly steeper at higher $z$ ($etasimeq 0.2+0.2log(1+z)$ describes the
data as well as constant $etasimeq 0.23$) and that the redshift-dependence
of the normalisation could be stronger ($zetasimeq 0.42$). The intrinsic
scatter in $sigma_0$ at given $M_*$ is $simeq 0.07$ dex for the fiducial
sample at $zlesssim 1.2$, but is found to increase with redshift in the
extended sample, being $simeq 0.11$ dex at $z=2$. Our results suggest that, on
average, the velocity dispersion of individual massive ($M_*gtrsim 5 imes
10^{11}M_odot$) ETGs decreases with time while they evolve from $zapprox 1$
to $zapprox 0$. | | Source: | arXiv, 1910.6987 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER