2011A&A...529A..64P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:47:45

2011A&A...529A..64P - Astronomy and Astrophysics, volume 529A, 64-64 (2011/5-1)

Study of stellar populations in the bulges of barred galaxies.

PEREZ I. and SANCHEZ-BLAZQUEZ P.

Abstract (from CDS):

We wish to determine the influence of bars on the building of galaxy bulges through analysis of ages and metallicities derived from stellar absorption line-strength indices. Long-slit spectroscopy was obtained for a sample of 20 early-type barred galaxies. Line-strength indices were measured and used to derive age and metallicity gradients in the bulge region by comparing them with stellar population models. The same analysis was carried out with similar data for unbarred galaxies taken from the literature. The bulges of barred galaxies seem to be more metal rich, at a given velocity dispersion (σ), than the bulges of unbarred galaxies, as measured by a few metallicity sensitive indices. There are indications that the ratio of relative abundance of alpha elements with respect to iron, [E/Fe], derived for the bulges of barred galaxies tend to lie above the values of the unbarred galaxies at a given σ. The metallicity gradients for the majority of the bulges are negative so less metal-rich towards the end of the bulge. The gradient values show a large scatter for galaxies with σ below 150 km.s–1. The age distribution is related to the presence of a bulge substructure, such as a nuclear ring or an inner disk. The metallicity of both the bulge and the bar are very well correlated, indicating a close link between the enrichment histories of both components. Bulges of barred early type galaxies might have experienced a different chemical enrichment than do the bulges of unbarred galaxies of the same morphological type, the same central velocity dispersion, and low inclination angles. The hinted stellar populations differences separating the bulges of barred and unbarred galaxies and the strong link between the metallicity of the bulge and the presence of a bar points to scenarios where they both form simultaneously in processes that lead to rapid and massive episodes of star formation, possibly linked to the bar formation. To confirm and generalise the results found here, it would be useful to extend the data set to a larger number of unbarred galaxies and a wider range of morphological types

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - galaxies: bulges - galaxies: structure - galaxies: stellar content - galaxies: evolution

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 1169 GiG 03 03 34.756 +46 23 10.74   13.2       ~ 100 0
2 NGC 1358 Sy2 03 33 39.6845285938 -05 05 22.226986857   14.10 13.05 11.76   ~ 184 1
3 NGC 1433 GiG 03 42 01.553 -47 13 19.49   10.84 9.99 9.61 10.2 ~ 305 0
4 NGC 1530 G 04 23 27.102 +75 17 44.05   13.40       ~ 252 1
5 NGC 1832 G 05 12 03.332 -15 41 16.01   12.2   11.07 11.8 ~ 223 1
6 NGC 2217 LIN 06 21 39.7510916579 -27 14 01.656348959   11.04 11.93 9.78 10.5 ~ 152 0
7 NGC 2273 Sy2 06 50 08.6724567505 +60 50 44.879789544   14.50 13.54     ~ 459 3
8 NGC 2523 IG 08 15 00.1395201387 +73 34 44.300684729   12.4       ~ 81 0
9 NGC 2665 EmG 08 46 00.981 -19 18 10.53   12.9   12.28 12.4 ~ 51 0
10 NGC 2681 LIN 08 53 32.739 +51 18 49.35 11.40 11.09 10.29     ~ 300 1
11 NGC 2787 LIN 09 19 18.6043000282 +69 12 11.642887220   12.92 11.79     ~ 316 0
12 NGC 2859 G 09 24 18.549 +34 30 48.16   11.8       ~ 237 0
13 NGC 2935 EmG 09 36 44.8512897095 -21 07 41.568483237   11.84 10.04 10.44 11.6 ~ 122 1
14 NGC 2962 GiP 09 40 53.9319870230 +05 09 57.021439517   13.1       ~ 180 0
15 NGC 2950 G 09 42 35.116 +58 51 04.39   11.8       ~ 188 0
16 NGC 3081 Sy2 09 59 29.5436045645 -22 49 34.748021329   13.06 13.55 11.67 12.1 ~ 412 0
17 NGC 3384 GiG 10 48 16.897 +12 37 45.48   10.0       ~ 554 1
18 NGC 3945 GiG 11 53 13.726 +60 40 32.02   11.6       ~ 221 0
19 NGC 4245 GiG 12 17 36.7828268294 +29 36 28.901023066   12.4       ~ 165 0
20 NGC 4314 LIN 12 22 31.978 +29 53 43.09 11.72 11.43 10.58     ~ 450 1
21 NGC 4394 GiP 12 25 55.6370604801 +18 12 50.115665445   11.9       ~ 333 0
22 NGC 4643 LIN 12 43 20.134 +01 58 42.24   11.9       ~ 238 0
23 NGC 5101 G 13 21 46.242 -27 25 49.87   11.26 10.47 9.87 10.5 ~ 168 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:47:45

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