2013MNRAS.431..440F


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST15:47:09

2013MNRAS.431..440F - Mon. Not. R. Astron. Soc., 431, 440-454 (2013/May-1)

The impact of a non-universal initial Mass Function on the star formation histories of early-type galaxies.

FERRE-MATEU A., VAZDEKIS A. and DE LA ROSA I.G.

Abstract (from CDS):

Recent results on the non-universality of the Initial Mass Function (IMF) have shown strong evidence of IMF variations with galaxy velocity dispersion, with a corresponding impact on other stellar population parameters, line indices and colours. Using a set of stellar population models with varying IMF slopes, we provide additional caveats on the assumption of a universal IMF. This study shows that the derived star formation histories of early-type galaxies vary significantly with the IMF slope. For instance, a steepening in the slope of a single power-law IMF decreases substantially, by a factor of up to 4, the contribution of the old stellar populations to the total light/mass. This trend is milder for a segmented-like IMF shape, where the contribution of the very low mass stars is decreased. It is also shown that, by tuning each IMF slope to its prescribed value according to each galaxy velocity dispersion, a sample of early-type galaxies covering a range of masses yield comparable star formation histories. On the one hand, a small contribution from relatively young stellar populations appears in the star formation histories of most massive elliptical galaxies when adopting a steep IMF. In addition, we find that low-mass early-type galaxies that look like genuinely young objects with a standard IMF (i.e. `baby elliptical galaxies') turn out to be older when a slightly flatter IMF is employed. In summary, the use of a non-universal IMF, tuned according to the velocity dispersion of the galaxy, seems to provide more consistent results.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: stellar content

Simbad objects: 24

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Number of rows : 24

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 2329 AGN 07 09 08.0060407484 +48 36 55.739351597   13.7 13.99     ~ 119 3
2 [TCD2009] NYU 2434587 G 11 16 59.3483370839 +17 09 17.372578779           ~ 3 0
3 NGC 4239 GiG 12 17 14.9407244878 +16 31 52.734917127   13.5       ~ 115 0
4 NGC 4339 GiP 12 23 34.9404906978 +06 04 54.466056554   13.1       ~ 225 0
5 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 806 0
6 NGC 4387 GiG 12 25 41.6768872639 +12 48 37.809497625 13.42 13.01 12.12   10.87 ~ 374 1
7 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6011 0
8 NGC 4458 GiP 12 28 57.532 +13 14 30.90 13.27 12.93 12.07     ~ 392 2
9 NGC 4464 GiG 12 29 21.313 +08 09 23.63   13.5       ~ 219 0
10 NGC 4467 GiG 12 29 30.267 +07 59 34.62   15.2       ~ 163 0
11 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1989 2
12 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 612 1
13 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6385 3
14 NGC 4489 GiG 12 30 52.240 +16 45 31.31   13.2       ~ 242 0
15 NGC 4551 GiP 12 35 37.980 +12 15 50.44 13.49 12.97 12.02     ~ 337 1
16 M 59 GiG 12 42 02.322 +11 38 48.95   11.0       ~ 667 0
17 NGC 4697 GiG 12 48 35.8992791099 -05 48 02.497675635   10.97   9.83   ~ 814 0
18 SDSS J143547.19+543528.7 G 14 35 47.2025966962 +54 35 28.698935880           ~ 4 0
19 SDSS J144736.37+432945.7 G 14 47 36.3724971530 +43 29 45.678926354           ~ 4 0
20 NGC 5812 GiP 15 00 55.708 -07 27 26.33   12   11.19   ~ 151 0
21 [TCD2009] NYU 54829 G 15 30 19.4566632299 -00 29 18.623365443           ~ 3 0
22 [TCD2009] NYU 890167 LIN 15 39 34.0700990884 +44 17 52.220730470           ~ 5 0
23 [TCD2009] NYU 321479 G 21 20 52.7474929444 +11 07 13.121698425           ~ 4 0
24 2MASS J22214033+1359141 AGN 22 21 40.3240627290 +13 59 14.161889953   18.36 17.63     ~ 4 0

    Equat.    Gal    SGal    Ecl

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2021.04.19-15:47:09

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