2004MNRAS.353..477C

Query : 2004MNRAS.353..477C

2004MNRAS.353..477C - Mon. Not. R. Astron. Soc., 353, 477-499 (2004/September-2)

Stellar populations and dust extinction in non-active and Seyfert spiral galaxies.

CUNOW B.

Abstract (from CDS):

Metallicity and age gradients of the stellar populations and dust extinction are studied for a sample of 32 non-active, seven type 1 Seyfert (S1) and 17 type 2 Seyfert (S2) spiral galaxies. The sample galaxies cover the whole range from face-on to edge-on view, and the variation of the optical and near-infrared colour gradients in the disc as a function of the inclination angle is investigated in order to separate colour changes caused by population gradients from those due to dust effects.

The measurements show that the observed colour gradients in the discs of the non-active galaxies are significantly larger than those found for the S1 and S2 galaxies. In the near-infrared wavelengths, however, these differences disappear, and the colour gradients are the same for all three galaxy types. No systematic differences are found between the colour gradients of the discs of the S1 galaxies and those of the S2 galaxies.

The data are compared to model images of dusty galaxies with a variety of age and metallicity gradients in the disc. The radial variations of the optical and near-infrared colours of the model galaxies are calculated from the radial changes of the ages and the metallicities of the stars, using broad-band colours of a single stellar population. The stellar content at a given position in the disc is determined by the average age, the metallicity and the star formation history.

For the non-active galaxies, the observed colour gradients are represented best by a model with a metallicity gradient, with the inner regions of the stellar disc being more metal-rich than the outer regions. However, the presence of an age gradient, with the inner regions of the stellar disc being older than the outer regions, cannot be ruled out. For the S1 and S2 galaxies, the comparison between data and models indicates that the age and metallicity gradients in the stellar disc are small. As far as the internal dust extinction is concerned, the comparison between data and models indicates that both the non-active and the S2 galaxies show significant dust extinction, but they are not optically thick.


Abstract Copyright: 2004 RAS

Journal keyword(s): dust, extinction - galaxies: abundances - galaxies: active - galaxies: spiral - galaxies: stellar content - galaxies: structure

Simbad objects: 55

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Number of rows : 55
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MCG-07-01-005 EmG 00 00 29.485 -40 29 04.07   14.40   13.40 13.9 ~ 27 0
2 NGC 115 LSB 00 26 46.278 -33 40 37.56   13.73   12.85 13.5 ~ 78 1
3 ESO 411-17 G 00 47 55.5266227440 -29 12 21.695007420   15.73 14.21 14.27   ~ 16 0
4 ESO 351-10 Sy2 00 49 49.7499497736 -35 20 03.476077872   16.08   14.50   ~ 14 0
5 MCG-05-03-007 EmG 00 50 45.709 -30 24 59.65   15.71   14.97   ~ 10 0
6 ESO 351-18 EmG 00 53 48.979 -33 17 42.82   15.054   14.494   ~ 31 0
7 ESO 351-22 EmG 00 55 06.5670993912 -36 39 25.087294224   15.56   14.35   ~ 9 0
8 ESO 351-24 EmG 00 57 11.5954382112 -36 35 30.235040340   16.07   14.61   ~ 13 0
9 MCG-06-03-016 EmG 01 00 59.9474816616 -35 14 32.799982416   15.43   14.02   ~ 19 0
10 ESO 352-11 G 01 09 16.349 -32 23 10.64   15.96   14.49   ~ 23 0
11 MCG-05-04-009 Sy2 01 12 49.854 -31 12 02.01   15.470   14.458   ~ 44 0
12 MCG-06-03-028 EmG 01 13 07.4150530776 -34 00 55.547797428   15.29   14.07   ~ 21 0
13 MCG-05-04-019 EmG 01 14 15.965 -32 15 03.25   15.16   14.32   ~ 13 0
14 MCG-05-04-021 Sy1 01 14 29.7386403840 -31 10 53.412506112   14.89   13.51   ~ 51 0
15 MCG-06-04-012 EmG 01 21 29.6395250928 -36 32 34.903719744   15.19   13.80   ~ 25 0
16 MCG-05-04-032 EmG 01 22 32.7199426392 -29 58 57.021651696   15.709   14.351   ~ 26 0
17 ESO 352-59 AG? 01 22 42.945 -34 39 14.07   15.91   15.38   ~ 10 0
18 MCG-06-04-030 EmG 01 25 12.6739301232 -35 48 59.367383892   15.12   13.85   ~ 28 0
19 MCG-06-04-043 Sy2 01 31 50.4211828920 -33 07 09.672692880   13.69 13.7 12.21 13.6 ~ 70 2
20 ESO 80-5 Sy2 01 47 39.2844124056 -66 09 47.480948676   16.05 16.0 14.57   ~ 19 0
21 ESO 153-20 Sy2 02 06 03.4672137720 -55 11 36.873277656   14.06 14.31 12.67 13.3 ~ 65 0
22 NGC 1241 Sy2 03 11 14.6195456232 -08 55 18.775959888 12.07 12.84 11.99 12.7 12.5 ~ 221 2
23 IC 1913 EmG 03 19 34.578 -32 27 54.41   14.38   13.54 14.2 ~ 81 0
24 NGC 1519 Sy1 04 08 07.591 -17 11 34.46   13.73   12.70   ~ 75 0
25 ESO 201-21 AG? 04 08 40.2629595096 -49 34 59.215206720   14.37       ~ 26 0
26 NGC 1591 Sy1 04 29 30.5379132408 -26 42 47.240666424   13.77   12.62   ~ 65 0
27 MCG-05-12-014 EmG 05 02 17.7323771904 -30 27 17.226546552   14.18   13.07   ~ 38 0
28 ESO 122-1 Sy2 06 40 43.2449894064 -58 31 28.550587044   13.14   11.47 12.7 ~ 46 0
29 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
30 ESO 263-13 Sy2 10 09 48.1876712664 -42 48 40.530472560   14.94 14.95 13.29   ~ 112 1
31 ESO 381-7 Sy1 12 40 46.9636781472 -33 34 11.848592460   15.94 15.9 14.76   ~ 40 0
32 NGC 4628 Sy2 12 42 25.2474767568 -06 58 15.805836228   13.8   13.5 12.9 ~ 81 0
33 NGC 4700 AGN 12 49 08.148 -11 24 35.48   12.7 14.32 12.7 12.5 ~ 107 0
34 NGC 4785 Sy2 12 53 27.3416048448 -48 44 57.213423456   13.22 12.09 12.8 12.5 ~ 75 0
35 IC 4253 Sy2 13 27 32.3651182176 -27 52 19.532657676   14.82   13.83 13.69 ~ 34 0
36 MCG-04-33-032 Sy2 14 01 58.4347704384 -25 32 19.651449516   14.29   13.13 13.08 ~ 39 0
37 NGC 5793 Sy2 14 59 24.807 -16 41 36.55   14.47 13.32 12.77   ~ 147 1
38 IC 4729 Sy2 18 39 56.4717963696 -67 25 32.588497524   13.59   11.84 13.0 ~ 55 0
39 ESO 140-43 Sy1 18 44 53.9892878664 -62 21 52.874216640   14.14 14.10 12.94 13.1 ~ 266 0
40 MCG-07-41-002 Sy2 19 58 30.8999594352 -40 48 55.950767388   13.76   12.70   ~ 20 0
41 NGC 6860 Sy2 20 08 46.8865940304 -61 05 59.782024608   13.70 13.53 12.14   ~ 203 0
42 NGC 6890 Sy2 20 18 18.1057797216 -44 48 24.750633168   13.06 14.02 11.57   ~ 171 0
43 NGC 6926 Sy2 20 33 06.1084582704 -02 01 38.498909376   14.87 13.87 13.0 12.5 ~ 172 2
44 IC 5039 EmG 20 43 14.3138782056 -29 51 12.017059236   13.45 12.60 12.28   ~ 73 0
45 NGC 6970 Sy1 20 52 09.4601778264 -48 46 40.049246064   13.16 12.68 11.99   ~ 46 0
46 IC 5105B EmG 21 26 00.1911189648 -40 50 05.076258216   13.73   12.68 13.2 ~ 45 0
47 MCG-07-45-002 Sy2 21 59 17.8140093336 -43 52 01.109469720   13.97   12.67   ~ 59 0
48 NGC 7214 Sy1 22 09 07.6631604816 -27 48 34.160960772   12.48 14.10 11.40   ~ 149 0
49 MCG-04-53-021 Sy2 22 36 55.9476942792 -22 13 15.048349248   14.33 13.90 13.41   ~ 46 0
50 NGC 7378 Sy2 22 47 47.6930804328 -11 48 59.863364316   13   12.74   ~ 69 0
51 NGC 7469 Sy1 23 03 15.6 +08 52 26 12.60 13.00 12.34     ~ 2253 3
52 MCG-05-54-016 EmG 23 08 55.613 -30 51 28.43   14.75   13.75 14.2 ~ 74 1
53 NGC 7590 Sy1 23 18 54.7949760192 -42 14 20.515300476   12.12 13.76 11.06 11.8 ~ 290 1
54 ESO 292-9 Sy2 23 40 24.3060159528 -44 30 51.827745456   14.61   13.34   ~ 34 2
55 IC 1490 Sy1 23 59 10.7275606392 -04 07 37.061295744   17.8   12.61   ~ 46 1

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