2004A&A...422..465P


Query : 2004A&A...422..465P

2004A&A...422..465P - Astronomy and Astrophysics, volume 422, 465-475 (2004/8-1)

Thick disks of lenticular galaxies 3D-photometric thin/thick disk decomposition of eight edge-on S0 galaxies.

POHLEN M., BALCELLS M., LUETTICKE R. and DETTMAR R.-J.

Abstract (from CDS):

Thick disks are faint and extended stellar components found around several disk galaxies including our Milky Way. The Milky Way thick disk, the only one studied in detail, contains mostly old disk stars (≃10Gyr), so that thick disks are likely to trace the early stages of disk evolution. Previous detections of thick disk stellar light in external galaxies have been originally made for early-type, edge-on galaxies but detailed 2D thick/thin disk decompositions have been reported for only a scant handful of mostly late-type disk galaxies. We present in this paper for the first time explicit 3D thick/thin disk decompositions characterising the presence and properties (e.g. scalelength and scaleheight) for a sample of eight lenticular galaxies by fitting 3D disk models to the data. For six out of the eight galaxies we were able to derive a consistent thin/thick disk model. The mean scaleheight of the thick disk is 3.6 times larger than that of the thin disk. The scalelength of the thick disk is about twice, and its central luminosity density between 3-10% of, the thin disk value. Both thin and thick disk are truncated at similar radii. This implies that thick disks extend over fewer scalelengths than thin disks, and turning a thin disk into a thick one requires therefore vertical but little radial heating. All these structural parameters are similar to thick disk parameters for later Hubble-type galaxies previously studied. We discuss our data in respect to present models for the origin of thick disks, either as pre- or post-thin-disk structures, providing new observational constraints.

Abstract Copyright:

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

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1613 2
2 NGC 1381 GiP 03 36 31.6592184144 -35 17 42.739221912 12.90 12.47 11.50 11.02   ~ 239 1
3 NGC 1596 GiP 04 27 38.1079224792 -55 01 39.852944076   12.01 10.97 10.54   ~ 114 0
4 NGC 2310 G 06 53 53.9856718776 -40 51 45.766145412 13.20 12.68 11.76 11.16   ~ 75 1
5 ESO 311-12 G 07 47 34.050 -41 27 07.71   12.83   11.14   ~ 40 0
6 IC 2531 EmG 09 59 55.6140265128 -29 37 04.575809208   13.19   11.54 12.1 ~ 137 1
7 NGC 3115 GiG 10 05 13.9270507008 -07 43 06.982712292   11   9.37   ~ 983 2
8 NGC 3564 GiG 11 10 36.3803064480 -37 32 51.219735648   13.31 12.21 11.67   ~ 53 0
9 NGC 3957 GiG 11 54 01.5349526640 -19 34 08.004900504   13.00   11.42   ~ 85 0
10 NGC 4179 GiG 12 12 52.1118346920 +01 17 58.926287976   12.8       ~ 167 0
11 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6385 0
12 NGC 4452 GiG 12 28 43.2980346552 +11 45 18.201826692 13.27 12.87 11.98     ~ 195 1
13 NGC 4521 GiP 12 32 47.6521626240 +63 56 21.065674776   13.0       ~ 82 0
14 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 929 0
15 NGC 4762 LIN 12 52 56.049 +11 13 50.88   11.1       ~ 350 0
16 NGC 5047 GiP 13 15 48.4943053680 -16 31 07.822979652   13.7   12.40   ~ 31 0
17 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 738 1
18 NGC 6504 G 17 56 05.7198487440 +33 12 30.466444032   13.4       ~ 49 0
19 ESO 342-17 G 21 12 10.7 -37 37 38   16.67   15.88   ~ 15 0
20 IC 5249 G 22 47 06.262 -64 49 55.42   14.35   13.36 13.7 ~ 88 0
21 NAME Local Group GrG ~ ~           ~ 7909 0

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2023.02.08-00:41:22

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