2008MNRAS.387..331S

Query : 2008MNRAS.387..331S

2008MNRAS.387..331S - Mon. Not. R. Astron. Soc., 387, 331-343 (2008/June-2)

Bimodality in low-luminosity E and S0 galaxies.

SANSOM A.E. and NORTHEAST M.S.

Abstract (from CDS):

Stellar population characteristics are presented for a sample of low-luminosity early-type galaxies (LLEs) in order to compare them with their more luminous counterparts. Long-slit spectra of a sample of 10 LLEs were taken with the ESO New Technology Telescope, selected for their low luminosities. Line strengths were measured on the Lick standard system. Lick indices for these LLEs were correlated with velocity dispersion (σ), alongside published data for a variety of Hubble types. The LLEs were found to fall below an extrapolation of the correlation for luminous ellipticals and were consistent with the locations of spiral bulges in plots of line strengths versus σ. Luminosity weighted average ages, metallicities and abundance ratios were estimated from χ2 fitting of 19 Lick indices to predictions from simple stellar population models. The LLEs appear younger than luminous ellipticals and of comparable ages to spiral bulges. These LLEs show a bimodal metallicity distribution, consisting of a low-metallicity group (possibly misclassified dwarf spheroidal galaxies) and a high-metallicity group (similar to spiral bulges). Finally, they have low α-element to iron peak abundance ratios indicative of slow, extended star formation.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

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

Simbad objects: 40

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Number of rows : 40
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 59 EmG 00 15 25.126 -21 26 39.68 14.01 13.21 12.59 12.31   ~ 111 0
2 HD 1461 PM* 00 18 41.8676757921 -08 03 10.803829898   7.14 6.46     G3VFe0.5 413 1
3 * 18 Cet PM* 00 45 28.6874352984 -12 52 50.911589280 6.86 6.76 6.15     G0V 254 0
4 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 526 0
5 * 25 Cet PM* 01 03 02.5369500840 -04 50 11.757188544   6.517 5.408     K0/1III 77 0
6 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1354 1
7 * kap For SB* 02 22 32.5904688744 -23 49 00.479863128   5.802 5.198   4.51 G0V 285 0
8 NGC 1331 GiG 03 26 28.3322458080 -21 21 19.955101860   14.25   12.86   ~ 79 0
9 NGC 1373 GiP 03 34 59.1993515280 -35 10 15.879086760 14.44 14.03 13.26     ~ 136 1
10 NGC 1374 EmG 03 35 16.5885737352 -35 13 34.563417168 12.46 11.97 11.08 10.59   ~ 322 1
11 NGC 1375 GiG 03 35 16.8025873104 -35 15 56.371399740 13.50 13.02 12.40 11.74   ~ 175 1
12 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
13 NAME Eridanus ClG GrG 03 38 32.00 -22 18 51.0           ~ 200 0
14 NGC 1411 EmG 03 38 44.8916837064 -44 06 02.048427900   12.06   10.76   ~ 113 0
15 * del Eri PM* 03 43 14.9005379551 -09 45 48.210955899 5.13 4.46 3.54 2.82 2.32 K0+IV 651 0
16 MCG-06-09-026 GiG 03 45 03.5753235792 -35 58 21.372259872   14.08   12.85   ~ 131 0
17 NAME NGC 1566 Group GrG 04 20 00.6 -54 56 17           ~ 180 0
18 ESO 157-30 GiG 04 27 32.6423254392 -54 11 48.449650596   14.30   13.29   ~ 41 0
19 ESO 118-34 GiG 04 40 17.485 -58 44 39.40   13.50 13.52 12.67 13.4 ~ 62 0
20 HD 49798 HXB 06 48 04.7001531360 -44 18 58.436036028 6.758 8.017 8.287 8.391 8.543 sdO6 339 0
21 * tet CMa PM* 06 54 11.3988612864 -12 02 19.061163780 7.20 5.51 4.08 2.95 2.17 K3/4III 233 0
22 NGC 2328 Sy1 07 02 36.193 -42 04 06.88   13.04   12.25 13.0 ~ 54 0
23 * 20 Mon PM* 07 10 13.6815026472 -04 14 13.585055244 6.73 5.95 4.92 4.13 3.61 K0III 162 0
24 * alf Mon PM* 07 41 14.8319734511 -09 33 04.077766984 5.83 4.95 3.93 3.16 2.64 G9.5III-IIIbFe-0.5 214 0
25 HD 64606 SB* 07 54 34.1880221064 -01 24 44.300470716 8.32 8.165 7.433 7.007 6.569 K0V 265 0
26 * eta Hya bC* 08 43 13.4757536071 +03 23 55.182801587 3.380 4.100 4.300 4.37 4.56 B3V 418 1
27 NGC 2784 EmG 09 12 19.497 -24 10 21.36 12.02 10.99 10.16 9.30   ~ 144 1
28 * iot Hya PM* 09 39 51.3614722468 -01 08 34.118633450 6.68 5.23 3.91 2.92 2.25 K2.5III 191 0
29 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
30 NGC 3125 AGN 10 06 33.318 -29 56 07.32 13.03 13.45 13.00 12.50 13.4 ~ 253 2
31 * lam Hya SB* 10 10 35.2885811545 -12 21 14.858923765 5.53 4.61 3.61 2.84 2.36 K0IIIbCN0.5 211 0
32 * alf Crt PM* 10 59 46.4651557828 -18 17 55.630394216 6.14 5.16 4.07 3.27 2.72 K0IIIb 224 0
33 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
34 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
35 HD 211038 PM* 22 14 38.2200242135 -15 49 06.713963189   7.44 6.54     G9.5IV-V 107 0
36 * 42 Peg PM* 22 41 27.7207176 +10 49 52.907917 3.10 3.33 3.41 3.43 3.50 B8.5IV 320 0
37 * psi01 Aqr PM* 23 15 53.4940495770 -09 05 15.844964053 6.37 5.36 4.25 3.46 2.90 K1-IIIFe-0.5 260 1
38 HD 219617 ** 23 17 05.04375 -13 51 03.5971 8.41 8.60 8.14 7.70 7.37 F8 317 0
39 HD 221148 PM* 23 29 32.0817754272 -04 31 57.892874556   7.34 6.25     K3-IIIbFe2 146 0
40 NAME Local Group GrG ~ ~           ~ 9325 0

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