2005A&A...435...29Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET13:14:51

2005A&A...435...29Z - Astronomy and Astrophysics, volume 435, 29-41 (2005/5-3)

The stellar populations of the bluest low surface brightness galaxies.

ZACKRISSON E., BERGVALL N. and OESTLIN G.

Abstract (from CDS):

Using optical/near-IR broadband photometry together with Hα emission line data, we attempt to constrain the star formation histories, ages, total stellar masses and stellar mass-to-light ratios for a sample of extremely blue low surface brightness galaxies. We find that, under standard assumptions about the stellar initial mass function, the Hα equivalent widths of these objects appear inconsistent with recently suggested scenarios including constant or increasing star formation rates over cosmological time scales. In a critical assessment of the prospects of obtaining ages from integrated broadband photometry, we conclude that even with near-IR data, the ages are poorly constrained and that current observations cannot rule out the possibility that these objects formed as recently as 1-2Gyr ago.
Method. which could potentially improve the age estimates are discussed. The stellar masses of these galaxies are inferred to lie below 1010M. This, in combination with low ages, could constitute a problem for current hierarchical models of galaxy formation, which predict objects of this mass to form predominantly early in the history of the universe. The possibility to use the ages of the bluest low surface brightness galaxies as a test of such models is demonstrated.

Abstract Copyright:

Journal keyword(s): galaxies: formation - galaxies: evolution - galaxies: fundamental parameters

Simbad objects: 20

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Number of rows : 20

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 ESO 546-9 G 02 41 57.26 -21 17 15.8   15.01   14.53 14.6 ~ 14 0
2 ESO 546-34 G 02 58 37.0 -18 41 57   15.54   15.02 15.7 ~ 35 0
3 ESO 31-13 G 03 16 00.9 -73 56 06   16.90   16.47   ~ 7 0
4 ESO 548-4 G 03 23 32.2 -18 40 00   17.54   17.10   ~ 9 0
5 SBSG 0335-052 bCG 03 37 44.04 -05 02 38.5     16.65     ~ 437 1
6 ESO 359-31 G 04 13 09.61 -34 25 34.8   14.56   14.29   ~ 25 0
7 ESO 84-41 IG 04 45 51.0 -63 23 34   17.02   16.55   ~ 5 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15064 1
9 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1007 1
10 ESO 505-4 GiG 12 01 29.8 -23 19 00   15.01   14.54 15.0 ~ 14 0
11 ESO 380-27 H2G 12 25 46.9 -36 14 01   17.47   16.52   ~ 97 1
12 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5931 0
13 ESO 462-32 G 20 31 55.1 -30 20 13   16.75   16.28   ~ 7 0
14 ESO 462-36 G 20 33 17.2 -27 23 13   16.13   15.75   ~ 6 0
15 ESO 74-16 G 20 52 47.7 -71 16 35   15.67   15.19 14.4 ~ 12 0
16 ESO 288-48 IG 22 11 28.13 -44 07 41.5   16.07   15.84   ~ 10 0
17 ESO 532-32 G 22 12 52.8 -25 38 35   16.19   15.64   ~ 23 0
18 ESO 146-14 G 22 13 00.0 -62 04 05   15.17   14.77 14.1 ~ 66 0
19 ESO 405-6 G 22 16 49.0 -36 23 58   14.67   14.36 14.9 ~ 16 0
20 ESO 602-26 G 22 31 47.2 -18 15 51   16.52   16.32   ~ 6 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-13:14:51

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