2016A&A...585A..97S


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.26CEST12:34:31

2016A&A...585A..97S - Astronomy and Astrophysics, volume 585A, 97-97 (2016/1-1)

Extragalactic archeology with the GHOSTS Survey. I. Age-resolved disk structure of nearby low-mass galaxies.

STREICH D., DE JONG R.S., BAILIN J., BELL E.F., HOLWERDA B.W., MINCHEV I., MONACHESI A. and RADBURN-SMITH D.J.

Abstract (from CDS):

We study the individual evolution histories of three nearby low-mass edge-on galaxies (IC5052, NGC4244, and NGC5023). Using resolved stellar populations, we constructed star count density maps for populations of different ages and analyzed the change of structural parameters with stellar age within each galaxy. We do not detect a separate thick disk in any of the three galaxies, even though our observations cover a wider range in equivalent surface brightness than any integrated light study. While scale heights increase with age, each population can be well described by a single disk. Two of the galaxies contain a very weak additional component, which we identify as the faint halo. The mass of these faint halos is lower than 1% of the mass of the disk. The three galaxies show low vertical heating rates, which are much lower than the heating rate of the Milky Way. This indicates that heating agents, such as giant molecular clouds and spiral structure, are weak in low-mass galaxies. All populations in the three galaxies exhibit no or only little flaring. While this finding is consistent with previous integrated light studies, it poses strong constraints on galaxy simulations, where strong flaring is often found as a result of interactions or radial migration.

Abstract Copyright:

Journal keyword(s): galaxies: individual: IC 5052 - galaxies: spiral - galaxies: individual: NGC 4244 - galaxies: individual: NGC 5023 - galaxies: evolution - galaxies: stellar content

Status at CDS:  

Simbad objects: 12

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Number of rows : 12

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 7814 GiG 00 03 14.947 +16 08 42.82   12.0       ~ 257 0
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2908 2
3 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1511 2
4 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 510 1
5 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 861 0
6 NGC 4627 GiG 12 41 59.9679553813 +32 34 24.810713707 13.16 13.06 12.43     ~ 128 1
7 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 963 2
8 NGC 5023 EmG 13 12 11.799 +44 02 16.88   13.2       ~ 214 0
9 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 670 1
10 IC 5052 G 20 52 01.633 -69 11 35.93 12.83 12.20 11.66 11.40   ~ 133 0
11 IC 5053 GiG 20 53 36.167 -71 08 28.09   14.06   12.73   ~ 24 0
12 NAME Local Group GrG ~ ~           ~ 6919 0

    Equat.    Gal    SGal    Ecl

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2020.05.26-12:34:31

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