2013ApJ...776...64G


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.06CEST01:20:38

2013ApJ...776...64G - Astrophys. J., 776, 64 (2013/October-3)

The stellar halos of massive elliptical galaxies. II. Detailed abundance ratios at large radius.

GREENE J.E., MURPHY J.D., GRAVES G.J., GUNN J.E., RASKUTTI S., COMERFORD J.M. and GEBHARDT K.

Abstract (from CDS):

We study the radial dependence in stellar populations of 33 nearby early-type galaxies with central stellar velocity dispersions σ* ≳ 150 km/s. We measure stellar population properties in composite spectra, and use ratios of these composites to highlight the largest spectral changes as a function of radius. Based on stellar population modeling, the typical star at 2Re is old (∼10 Gyr), relatively metal-poor ([Fe/H] ~ -0.5), and α-enhanced ([Mg/Fe] ~ 0.3). The stars were made rapidly at z ~ 1.5-2 in shallow potential wells. Declining radial gradients in [C/Fe], which follow [Fe/H], also arise from rapid star formation timescales due to declining carbon yields from low-metallicity massive stars. In contrast, [N/Fe] remains high at large radius. Stars at large radius have different abundance ratio patterns from stars in the center of any present-day galaxy, but are similar to average Milky Way thick disk stars. Our observations are thus consistent with a picture in which the stellar outskirts are built up through minor mergers with disky galaxies whose star formation is truncated early (z ~ 1.5-2).

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: evolution

Simbad objects: 37

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Number of rows : 37

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 219 GiC 00 42 11.3134638913 +00 54 16.404850479   15.6       ~ 20 0
2 NGC 426 LIN 01 12 48.6024173242 -00 17 24.734587795   16.33 15.58     ~ 73 0
3 NGC 474 GiP 01 20 06.696 +03 24 54.97 12.75 12.37 11.51 11.42 10.56 ~ 324 1
4 NGC 661 GiG 01 44 14.5986547790 +28 42 21.153100307   13.0       ~ 96 0
5 NGC 677 GiG 01 49 14.050 +13 03 19.28   14.3       ~ 64 0
6 UGC 1382 LIN 01 54 41.0378675890 -00 08 36.031594385   14.4   14.1 13.9 ~ 45 0
7 NGC 774 LIN 01 59 34.7356271470 +14 00 29.558316999   13.97       ~ 66 1
8 IC 301 GiG 03 14 47.7322568553 +42 13 21.672087838   15.2       ~ 22 0
9 NGC 1286 G 03 17 48.5251674163 -07 37 00.640139482   15   13.38   ~ 19 0
10 IC 312 GiG 03 18 08.4133745826 +41 45 15.752768407   14.9       ~ 35 0
11 NGC 1267 GiG 03 18 45.008 +41 28 04.25   15.4       ~ 32 0
12 NGC 1270 GiG 03 18 58.144 +41 28 12.15   14.4       ~ 76 0
13 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 2007 1
14 NGC 1277 GiG 03 19 51.488 +41 34 24.26   14.9       ~ 159 0
15 NAME NVSS J0320+4136 GiG 03 20 50.7045481810 +41 36 01.496210247           ~ 20 0
16 MCG+00-09-089 LIN 03 30 17.161 -00 55 12.34   15.1       ~ 15 0
17 UGC 4051 GiG 07 51 17.647 +50 10 45.49   14.4       ~ 24 0
18 NGC 3837 GiG 11 43 56.4178294753 +19 53 40.408089496 15.18 14.68   12.99   ~ 89 1
19 NGC 3842 BiC 11 44 02.155 +19 56 59.37 14.22 13.70 11.82 12.04   ~ 259 3
20 NGC 4065 LIN 12 04 06.168 +20 14 06.30   14.0       ~ 87 0
21 IC 834 GiG 12 56 18.5974615182 +26 21 32.048876730   15.2       ~ 45 0
22 NGC 4889 BiC 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 659 1
23 NGC 4908 LIN 13 00 51.581 +28 02 34.19 15.05 14.9 13.58 13.273 12.566 ~ 115 0
24 NGC 4952 LIN 13 04 58.392 +29 07 20.50   13.39 13.01     ~ 87 1
25 NGC 5080 G 13 19 19.219 +08 25 44.39   14.6       ~ 15 0
26 NGC 5127 LIN 13 23 45.018 +31 33 56.72   13.9       ~ 163 0
27 NGC 5423 GiG 14 02 48.624 +09 20 28.95   13.9       ~ 58 0
28 2MASX J15174176-0042175 GiC 15 17 41.7636425994 -00 42 17.587792307           ~ 19 0
29 NGC 5982 LIN 15 38 39.778 +59 21 21.21   12.4       ~ 279 0
30 IC 1152 GiG 15 56 43.321 +48 05 42.05   14.4       ~ 37 0
31 IC 1153 LIN 15 57 03.014 +48 10 06.15   13.6       ~ 44 0
32 MCG+04-38-015 GiG 16 02 30.462 +21 07 14.55   14.8       ~ 17 0
33 NGC 6125 G 16 19 11.554 +57 59 02.80   13.0       ~ 88 0
34 NGC 6482 GiG 17 51 48.8334002678 +23 04 18.884647281 12.71 12.35 11.45     ~ 193 1
35 NGC 6964 G 20 47 24.3030858807 +00 18 02.973003561 14.51 14.00 12.99     ~ 80 1
36 NGC 7509 LIN 23 12 21.4169871685 +14 36 33.759600351   17.53 16.47     ~ 25 0
37 NGC 7684 LIN 23 30 32.0346788462 +00 04 51.750173069   14.57       ~ 38 1

    Equat.    Gal    SGal    Ecl

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2021.05.06-01:20:38

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