2017MNRAS.467..353M


Query : 2017MNRAS.467..353M

2017MNRAS.467..353M - Mon. Not. R. Astron. Soc., 467, 353-368 (2017/May-1)

The imprints of bars on the vertical stellar population gradients of galactic bulges.

MOLAEINEZHAD A., FALCON-BARROSO J., MARTINEZ-VALPUESTA I., KHOSROSHAHI H.G., VAZDEKIS A., LA BARBERA F., PELETIER R.F. and BALCELLS M.

Abstract (from CDS):

This is the second paper of a series aimed to study the stellar kinematics and population properties of bulges in highly inclined barred galaxies. In this work, we carry out a detailed analysis of the stellar age, metallicity and [Mg/Fe] of 28 highly inclined (i > 65°) disc galaxies, from S0 to S(B)c, observed with the SAURON integral-field spectrograph. The sample is divided into two clean samples of barred and unbarred galaxies, on the basis of the correlation between the stellar velocity and h3 profiles, as well as the level of cylindrical rotation within the bulge region. We find that while the mean stellar age, metallicity and [Mg/Fe] in the bulges of barred and unbarred galaxies are not statistically distinct, the [Mg/Fe] gradients along the minor axis (away from the disc) of barred galaxies are significantly different than those without bars. For barred galaxies, stars that are vertically further away from the mid-plane are in general more [Mg/Fe]-enhanced and thus the vertical gradients in [Mg/Fe] for barred galaxies are mostly positive, while for unbarred bulges the [Mg/Fe] profiles are typically negative or flat. This result, together with the old populations observed in the barred sample, indicates that bars are long-lasting structures, and therefore are not easily destroyed. The marked [Mg/Fe] differences with the bulges of unbarred galaxies indicate that different formation/evolution scenarios are required to explain their build-up, and emphasizes the role of bars in redistributing stellar material in the bulge-dominated regions.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: abundances - galaxies: bulges - galaxies: evolution - galaxies: formation - galaxies: kinematics and dynamics - galaxies: stellar content - galaxies: stellar content

Simbad objects: 29

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Number of rows : 29
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 3098 GiG 10 02 16.6962227999 +24 42 39.929851567   13.00       ~ 125 0
2 NGC 4026 GiP 11 59 25.0903700828 +50 57 41.935297936   12.17       ~ 245 0
3 NGC 4036 LIN 12 01 26.891 +61 53 44.52   12.18 11.20     ~ 240 0
4 NGC 4179 GiG 12 12 52.1114216001 +01 17 58.952313083   12.8       ~ 161 0
5 NGC 4251 GiP 12 18 08.306 +28 10 31.08   11.5       ~ 189 0
6 NGC 4270 GiP 12 19 49.435 +05 27 48.14   13.3       ~ 168 0
7 NGC 4346 GiG 12 23 27.942 +46 59 37.97   12.3       ~ 106 0
8 NGC 4425 GiG 12 27 13.3358624164 +12 44 05.189370805 13.12 12.73 11.83     ~ 175 1
9 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 419 2
10 NGC 4461 GiP 12 29 03.010 +13 11 01.88 12.56 12.09 11.19     ~ 224 2
11 NGC 4474 GiG 12 29 53.544 +14 04 07.22   12.6       ~ 249 0
12 NGC 4521 GiP 12 32 47.6444133744 +63 56 21.085871461   13.0       ~ 79 0
13 NGC 4710 H2G 12 49 38.958 +15 09 55.76   11.6       ~ 289 0
14 NGC 4762 LIN 12 52 56.049 +11 13 50.88   11.1       ~ 342 0
15 NGC 5103 GiG 13 20 30.055 +43 05 02.45   13.6       ~ 87 0
16 NGC 5326 GiP 13 50 50.713 +39 34 29.69   12.9   11.38   ~ 80 0
17 NGC 5353 GiP 13 53 26.7 +40 16 59   11.8   10.57   ~ 256 1
18 NGC 5422 GiG 14 00 42.063 +55 09 52.12   13.1       ~ 144 0
19 NGC 5475 GiG 14 05 12.4048669713 +55 44 30.678096772   13.4       ~ 89 0
20 NGC 5574 GiP 14 20 55.9683239893 +03 14 16.790076636 13.54 13.23 12.39     ~ 134 1
21 NGC 5611 G 14 24 04.7751152470 +33 02 50.694563824   13.5       ~ 75 0
22 NGC 5689 GiP 14 35 29.670 +48 44 29.37   12.7       ~ 117 0
23 NGC 5707 GiP 14 37 30.7760807214 +51 33 42.559635505   13.3       ~ 74 0
24 NGC 5746 GiP 14 44 56.005 +01 57 17.06   12.3       ~ 332 0
25 NGC 5838 GiP 15 05 26.272 +02 05 57.68   12.1   10.26   ~ 224 0
26 NGC 5854 GiG 15 07 47.6988967536 +02 34 07.058455395   13.1   11.23   ~ 140 0
27 NGC 5864 GiG 15 09 33.5678304643 +03 03 09.975063874   12.9   11.18   ~ 95 0
28 NGC 6010 G 15 54 19.1558706937 +00 32 34.947185274   13.3       ~ 77 0
29 NAME Galactic Bulge reg ~ ~           ~ 3659 0

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2021.09.24-22:55:16

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