2007A&A...467..991B


Query : 2007A&A...467..991B

2007A&A...467..991B - Astronomy and Astrophysics, volume 467, 991-1001 (2007/6-1)

Metallicity and age gradients in round elliptical galaxies.

BAES M., SIL'CHENKO O.K., MOISEEV A.V. and MANAKOVA E.A.

Abstract (from CDS):

We probe the stellar population age and metallicity distributions in nearby elliptical galaxies over the largest extension to date. Long-slit spectroscopy is made by using the spectrograph SCORPIO of the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciencies. The Lick indices Hβ, Mg b, Fe 5270, and Fe 5335 are calculated along the slit up to radii of 1.3 to 3re in 4 galaxies and up to 0.5re in the fifth one. The comparison with evolutionary synthesis models of simple stellar populations allows us to disentangle age and metallicity and to measure both. We have found that the mean stellar age is constant along the radius only in one galaxy out of 5. The other 4 galaxies demonstrate quite different behaviour of the mean stellar age: the outer parts are older than the centres in 3 cases and younger - in one case. The metallicity gradients cannot be approximated by a single power law over the full radial extension in 4 galaxies of 5. The inner metallicity gradients within 0.5re are all rather steep, steeper than -0.4 metallicity dex per radius dex, and are inconsistent with the origin of the elliptical galaxies by a major merger.

Abstract Copyright:

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

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 IC 2179 GiP 07 15 32.2961542224 +64 55 34.512382632   13.4       ~ 21 0
2 NGC 2347 LIN 07 16 04.087 +64 42 41.54   13.2       ~ 110 0
3 NGC 2550 GiG 08 24 33.640 +74 00 44.30   13.1       ~ 37 0
4 NGC 2633 GiP 08 48 04.6279110889 +74 05 55.032130996   12.4       ~ 162 1
5 NGC 2634 GiP 08 48 25.3648660440 +73 58 01.883152560   12.6       ~ 85 0
6 UGC 4585 GiP 08 48 38.174 +73 56 21.54   14.3       ~ 31 0
7 NGC 2810 G 09 22 04.5015145728 +71 50 38.436659340   13.4       ~ 43 1
8 NGC 3348 GiG 10 47 10.0367649672 +72 50 22.685834940   12.0       ~ 111 0
9 MCG+12-10-079 G 10 47 41.7842740440 +72 49 18.835752648   16       ~ 6 0
10 HD 102328 * 11 46 55.6222860288 +55 37 41.480416020   6.528 5.254     K2.5IIIbCN1 144 0
11 NGC 4339 GiP 12 23 34.9398092592 +06 04 54.467043780   13.1       ~ 229 0
12 NGC 6356 GlC 17 23 34.99 -17 48 46.9   10.01 7.42     ~ 334 1
13 NGC 6539 GlC 18 04 49.74 -07 35 09.1           ~ 208 0
14 HD 167042 PM* 18 10 31.6398993768 +54 17 11.592196980   6.89   5.4   K1III 142 1
15 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 824 1
16 M 71 GlC 19 53 46.49 +18 46 45.1   7.91 6.1     ~ 1074 0

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2022.06.30-21:20:17

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