2020MNRAS.496.1857L

Query : 2020MNRAS.496.1857L

2020MNRAS.496.1857L - Mon. Not. R. Astron. Soc., 496, 1857-1880 (2020/August-1)

Dynamical masses of brightest cluster galaxies I: stellar velocity anisotropy and mass-to-light ratios.

LOUBSER S.I., BABUL A., HOEKSTRA H., BAHE Y.M., O'SULLIVAN E. and DONAHUE M.

Abstract (from CDS):

We investigate the stellar and dynamical mass profiles in the centres of 25 brightest cluster galaxies (BCGs) at redshifts of 0.05 <= z <= 0.30. Our spectroscopy enables us to robustly measure the Gauss-Hermite higher order velocity moments h3 and h4, which we compare to measurements for massive early-type galaxies, and central group galaxies. We measure positive central values for h4 for all the BCGs. We derive the stellar mass-to-light ratio (Υ_*DYN_), and velocity anisotropy (β) based on a multi-Gaussian expansion (MGE) and axisymmetric Jeans Anisotropic Methods (cylindrically and spherically aligned). We explicitly include a dark matter halo mass component, which is constrained by weak gravitational lensing measurements for these clusters. We find a strong correlation between anisotropy and velocity dispersion profile slope, with rising velocity dispersion profiles corresponding to tangential anisotropy and decreasing velocity dispersion profiles corresponding to radial anisotropy. The rising velocity dispersion profiles can also indicate a significant contribution from the intracluster light (ICL) to the total light (in projection) in the centre of the galaxy. For a small number of BCGs with rising velocity dispersion profiles, a variable stellar mass-to-light ratio can also account for the profile shape, instead of tangential anisotropy or a significant ICL contribution. We note that, for some BCGs, a variable βz(r) (from radial to tangential anisotropy) can improve the model fit to the observed kinematic profiles. The observed diversity in these properties illustrates that BCGs are not the homogeneous class of objects they are often assumed to be.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: clusters: general - galaxies: kinematics and dynamics - galaxies: stellar content - galaxies: elliptical and lenticular, cD

Simbad objects: 65

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Number of rows : 65
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 68 ClG 00 37 06.2 +09 09 33           ~ 195 0
2 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 869 2
3 NGC 410 GiG 01 10 58.9016492712 +33 09 07.053878052 13.08 12.52 11.48     ~ 163 2
4 NGC 524 GiP 01 24 47.7429545736 +09 32 20.089023900   11.5       ~ 494 1
5 NGC 584 Sy2 01 31 20.7231919800 -06 52 04.770287472 11.93 11.44 10.48     ~ 417 2
6 ACO 267 ClG 01 52 43.016 +00 59 58.90           ~ 241 0
7 NGC 777 BLL 02 00 14.9065707744 +31 25 45.850721628 13.09 12.49 11.45     ~ 195 2
8 NGC 924 GiG 02 26 46.8206455368 +20 29 51.036018756   13.8       ~ 70 0
9 NGC 1060 GiG 02 43 15.045 +32 25 30.04 13.71 13.00 11.81     ~ 117 1
10 ACO 383 ClG 02 48 03.3915 -03 31 45.228           ~ 389 0
11 NGC 1453 EmG 03 46 27.2307890592 -03 58 07.831476768   13   11.30   ~ 189 0
12 NGC 1587 GiP 04 30 39.9359019384 +00 39 41.922470340   13.3       ~ 146 0
13 ClG 0440+02 ClG 04 43 09.7 +02 10 19     17.03     ~ 129 0
14 NGC 1779 Sy2 05 05 18.0311553816 -09 08 50.070486912   13.18   11.86   ~ 47 0
15 ACO 586 ClG 07 32 20.3 +31 37 58           ~ 196 0
16 ACO 611 ClG 08 00 58.7 +36 02 49           ~ 275 0
17 ACO 644 ClG 08 17 26.1 -07 31 13           ~ 241 0
18 NGC 2563 GiG 08 20 35.6870161656 +21 04 04.111020012   13.7 12.39     ~ 163 1
19 ACO 646 ClG 08 22 10.0 +47 05 58           ~ 102 1
20 2MASX J09083238-0937470 BiC 09 08 32.388 -09 37 47.06   14.32   13.32   ~ 41 2
21 ACO 750 ClG 09 09 06.7 +11 01 48           ~ 105 1
22 ACO 754 ClG 09 09 14.8 -09 40 35           ~ 695 1
23 NGC 2768 SyG 09 11 37.504 +60 02 13.95 11.30 10.84 9.87     ~ 526 2
24 ACO 780 ClG 09 18 30 -12 15.7           ~ 469 0
25 ACO 963 ClG 10 17 03.4 +39 02 56           ~ 414 0
26 ACO 990 ClG 10 23 39.46 +49 08 19.6           ~ 88 0
27 ACO 1201 ClG 11 12 54.4 +13 26 08           ~ 131 1
28 NGC 3613 GiG 11 18 36.130 +57 59 59.73   11.6       ~ 221 0
29 NGC 3665 GiG 11 24 43.630 +38 45 46.05 13.71 13.26 11.62     ~ 364 1
30 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1290 0
31 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 671 1
32 NGC 4486B GiG 12 30 31.985 +12 29 24.85   14.5       ~ 428 0
33 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
34 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
35 NGC 4550 GiP 12 35 30.5913588048 +12 13 14.921166792 12.97 12.56 11.68     ~ 558 1
36 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1156 1
37 ACO 1650 ClG 12 58 42.0 -01 45 45           ~ 325 0
38 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1178 0
39 NGC 5127 LIN 13 23 45.0315298080 +31 33 56.527040808   13.9       ~ 183 0
40 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 335 0
41 ACO 1795 ClG 13 48 47.4 +26 34 55           ~ 1330 0
42 NGC 5353 rG 13 53 26.7104646981 +40 16 59.200050598   11.8   10.57   ~ 309 1
43 ACO 1835 ClG 14 01 02.07 +02 52 43.2           ~ 727 1
44 NGC 5490 GiG 14 09 57.330 +17 32 43.53   13.4 15.5     ~ 178 1
45 NGC 5629 GiG 14 28 16.3720374384 +25 50 55.459877604   14.2       ~ 78 0
46 ACO 1942 ClG 14 38 21.8673 +03 40 13.247           ~ 122 0
47 ACO 1991 ClG 14 54 41.53 +18 38 08.4           ~ 349 1
48 ZwCl 1455+2232 ClG 14 57 15.2 +22 20 30     18.62 20.04   ~ 309 0
49 NGC 5846 rG 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 891 2
50 ACO 2029 ClG 15 10 54.2 +05 44 23           ~ 1020 0
51 ACO 2050 ClG 15 16 18.7 +00 05 31           ~ 122 0
52 ACO 2055 ClG 15 18 46.29 +06 13 42.9           ~ 113 0
53 NGC 5982 LIN 15 38 39.778 +59 21 21.21   12.4       ~ 302 0
54 ACO 2104 ClG 15 40 06.8 -03 17 39           ~ 113 0
55 ACO 2142 ClG 15 58 26.5 +27 13 52           ~ 825 0
56 ACO 2199 ClG 16 28 34.5 +39 32 26           ~ 1206 1
57 NGC 6166 Sy2 16 28 38.24470063 +39 33 04.2335319   12.78 11.78     ~ 793 2
58 ACO 2259 ClG 17 20 09.2 +27 40 09           ~ 131 0
59 ACO 2261 ClG 17 22 26.9 +32 07 58           ~ 370 0
60 NGC 6658 GiG 18 33 55.6327067976 +22 53 17.737619712   15.0       ~ 46 0
61 ACO 2319 ClG 19 21 14.0 +43 56 57           ~ 495 1
62 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 732 2
63 ACO 2420 ClG 22 10 22.5 -12 11 13           ~ 126 0
64 ACO 2537 ClG 23 08 22.3 -02 11 29           ~ 152 0
65 NGC 7619 GiG 23 20 14.524 +08 12 22.63   12.7       ~ 472 0

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