2021MNRAS.507.3089D

Query : 2021MNRAS.507.3089D

2021MNRAS.507.3089D - Mon. Not. R. Astron. Soc., 507, 3089-3112 (2021/October-3)

Mapping accreted stars in early-type galaxies across the mass-size plane.

DAVISON T.A., NORRIS M.A., LEAMAN R., KUNTSCHNER H., BOECKER A. and VAN DE VEN G.

Abstract (from CDS):

Galaxy mergers are instrumental in dictating the final mass, structure, stellar populations, and kinematics of galaxies. Cosmological galaxy simulations indicate that the most massive galaxies at z = 0 are dominated by high fractions of 'ex-situ' stars, which formed first in distinct independent galaxies, and then subsequently merged into the host galaxy. Using spatially resolved MUSE spectroscopy we quantify and map the ex-situ stars in thirteen massive early-type galaxies. We use full spectral fitting together with semi-analytic galaxy evolution models to isolate the signatures in the galaxies' light which are indicative of ex-situ populations. Using the large MUSE field of view we find that all galaxies display an increase in ex-situ fraction with radius, with massive and more extended galaxies showing a more rapid increase in radial ex-situ fraction (reaching values between ∼30 per cent and 100 per cent at 2 effective radii) compared to less massive and more compact sources (reaching between ∼5 per cent and 40 per cent ex-situ fraction within the same radius). These results are in line with predictions from theory and simulations which suggest ex-situ fractions should increase significantly with radius at fixed mass for the most massive galaxies.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

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

Simbad objects: 20

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Number of rows : 20
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 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
2 NGC 1332 GiP 03 26 17.321 -21 20 07.33   11.45   9.84   ~ 378 0
3 NGC 1380 Sy2 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 460 1
4 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
5 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
6 NGC 1404 rG 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 787 1
7 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
8 NGC 2992 Sy2 09 45 42.045 -14 19 34.90 13.54 13.14 12.18 12.6 12.2 ~ 951 3
9 [BLD2000] A245N G 09 45 44.1 -14 17 28           ~ 10 2
10 NGC 2993 Sy1 09 45 48.325 -14 22 06.02 12.72 13.11 12.64 13.4 13.0 ~ 194 2
11 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
12 NGC 3311 EmG 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 310 2
13 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 671 1
14 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1465 2
15 ACO 3526 ClG 12 48 49.2 -41 18 17           ~ 1154 2
16 NGC 4696 rG 12 48 49.2724775784 -41 18 39.304053252   11.21   10.7   ~ 510 3
17 NGC 5846A GiP 15 06 29.2023813744 +01 35 41.627266512   14.1 13.37 13.07 12.1 ~ 125 0
18 NGC 5846 rG 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 891 2
19 IC 1459 rG 22 57 10.60682195 -36 27 43.9966421   10.96 11.85 9.34 10.3 ~ 652 2
20 NAME Local Group GrG ~ ~           ~ 9325 0

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