|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
A discrete chemo-dynamical model of M87's globular clusters: Kinematics extending to ~ 400 kpc | | Chao Li
; Ling Zhu
; R. J. Long
; Shude Mao
; Eric W. Peng
; Marc Sarzi
; Glenn van de Ven
; Hongxin Zhang
; Rui Guo
; Xiangxiang Xue
; Alessia Longobardi
; Patrick Côté
; Laura Ferrarese
; Chengze Liu
; Stephen Gwyn
; Sungsoon Lim
; Youkyung Ko
; | | Date: |
19 May 2020 | | Abstract: | We study the mass distribution and kinematics of the giant elliptical galaxy
M87 (NGC 4486) using discrete chemo-dynamical, axisymmetric Jeans equation
modelling. Our catalogue comprises 894 globular clusters (GCs) extending to a
projected radius of $sim 430$ kpc with line-of-sight velocities and colours,
and Multi Unit Spectroscopic Explorer (MUSE) integral field unit data within
the central $2.4$ kpc of the main galaxy. The gravitational potential for our
models is a combination of a luminous matter potential with a varying
mass-to-light ratio for the main galaxy, a supermassive black hole and a dark
matter (DM) potential with a cusped or cored DM halo. The best-fitting models
with either a cusped or a cored DM halo show no significant differences and
both are acceptable. We obtain a total mass of $(2.16 pm 0.38) imes 10^{13}
M_{odot}$ within $sim$ 400 kpc. By including the stellar mass-to-light ratio
gradient, the DM fraction increases from $sim$ 26 percent (with no gradient)
to $sim$ 73 percent within $1,R_e^{
m maj}$ (major axis of half-light
isophote, 14.2 kpc), and from $sim$ 84 percent to $sim$ 94 percent within
$5,R_e^{
m maj}$ (71.2 kpc). Red GCs have moderate rotation with $V_{
m
max}/sigma sim$ 0.4, and blue GCs have weak rotation with $V_{
m max}/sigma
sim$ 0.1. Red GCs have tangential velocity dispersion anisotropy, while blue
GCs are consistent with being nearly isotropic. Our results suggest that red
GCs are more likely to be born in-situ, while blue GCs are more likely to be
accreted. | | Source: | arXiv, 2005.9410 | | 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