2003MNRAS.339..772R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET12:43:33

2003MNRAS.339..772R - Mon. Not. R. Astron. Soc., 339, 772-792 (2003/March-1)

Stellar population gradients in Seyfert 2 galaxies: northern sample.

RAIMANN D., STORCHI-BERGMANN T., GONZALEZ-DELGADO R.M., CID FERNANDES R., HECKMAN T., LEITHERER C. and SCHMITT H.

Abstract (from CDS):

We use high signal-to-noise ratio long-slit spectra in the λλ3600-4700 range of the 20 brightest northern Seyfert 2 galaxies to study the variation of the stellar population properties as a function of distance from the nucleus. In order to characterize the stellar population and other continuum sources (e.g. featureless continuum, FC) we have measured the equivalent width, W, of six absorption features, four continuum colours and their radial variations, and performed spectral population synthesis as a function of distance from the nucleus. About half of the sample has CaiiK and G band W values smaller at the nucleus than at 1 kpc from it, owing to a younger population and/or FC. The stellar population synthesis shows that, while at the nucleus, 75 per cent of the galaxies present contribution >20 per cent of ages ≤100 Myr and/or of an FC, this proportion decreases to 45 per cent at 3 kpc. In particular, 55 per cent of the galaxies have a contribution >10 per cent of the 3-Myr/FC component (a degenerate component in which one cannot separate what is caused by an FC or by a 3-Myr stellar population) at the nucleus, but only 25 per cent of them have this contribution at 3 kpc. As a reference, the stellar population of 10 non-Seyfert galaxies, spanning the Hubble types of the Seyfert (from S0 to Sc) was also studied. A comparison between the stellar population of the Seyferts and that of the non-Seyferts shows systematic differences: the contribution of ages younger than 1 Gyr is in most cases larger in the Seyfert galaxies than in non-Seyferts, not only at the nucleus but up to 1 kpc from it.

Abstract Copyright: RAS

Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: stellar content

Simbad objects: 29

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Number of rows : 29

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 262 Sy2 00 48 47.1414900 +31 57 25.083955 14.04 13.90 13.06 8.53   ~ 677 3
2 NGC 449 Sy2 01 16 07.2096682810 +33 05 21.651153340   15.90 14.96     ~ 270 4
3 Mrk 573 Sy2 01 43 57.7763654544 +02 20 59.525472345   14.90 14.07     ~ 489 0
4 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4124 2
5 Mrk 1066 Sy2 02 59 58.5970307633 +36 49 13.808979663   14.89 13.96     ~ 322 1
6 NGC 1232 EmG 03 09 45.514 -20 34 45.48   10.67 9.87 9.53 10.2 ~ 266 0
7 Mrk 1073 Sy2 03 15 01.406 +42 02 08.39   15.05 14.18 12.54   ~ 177 1
8 NGC 1367 GiG 03 35 01.351 -24 55 59.19   11.48   9.98 11.1 ~ 171 0
9 NGC 1386 GiP 03 36 46.238 -35 59 57.39 12.42 12.16 11.23 10.76   ~ 466 1
10 NGC 1425 EmG 03 42 11.4841820747 -29 53 36.192654761   11.61   11.6 10.9 ~ 187 0
11 NGC 1637 AGN 04 41 28.229 -02 51 28.94   11.4   11.0 11.3 ~ 374 0
12 NGC 2110 Sy2 05 52 11.3760694860 -07 27 22.489931610   14.77 13.51 11.86   ~ 590 1
13 Mrk 3 Sy2 06 15 36.458 +71 02 15.24 14.21 14.03 12.97     ~ 849 3
14 Mrk 78 Sy2 07 42 41.7030525112 +65 10 37.433697338   15.57 14.58     ~ 332 2
15 NGC 3054 GiG 09 54 28.605 -25 42 12.37   12.27   10.92 11.4 ~ 133 0
16 NGC 3223 EmG 10 21 35.076 -34 16 00.44   11.82 10.82 10.35 11.2 ~ 161 0
17 Mrk 34 Sy2 10 34 08.606 +60 01 52.33   15.71 14.65     ~ 215 1
18 NGC 3358 GiG 10 43 33.0214820761 -36 24 38.565489084   12.44 11.53 11.01 11.6 ~ 65 0
19 IC 3639 Sy2 12 40 52.8357581136 -36 45 21.046225445   13.01 13.50 11.87 12.7 ~ 228 1
20 NGC 5135 Sy2 13 25 44.059 -29 50 01.24   12.58 13.35 11.53 12.2 ~ 430 1
21 Mrk 273 Sy2 13 44 42.164 +55 53 13.53   15.68 14.91     ~ 830 3
22 Mrk 463E Sy2 13 56 02.886 +18 22 18.84   15.01 14.22     ~ 141 1
23 Mrk 477 Sy2 14 40 38.098 +53 30 16.24   16.05 15.03     ~ 283 1
24 NGC 5929 GiP 15 26 06.158 +41 40 14.40   13.0 14.00     ~ 417 0
25 NGC 5930 GiP 15 26 07.9964334517 +41 40 33.691556640   13.0       ~ 413 0
26 NGC 7049 GiP 21 19 00.249 -48 33 43.24   11.28 10.74 9.77   ~ 131 1
27 NGC 7130 AGN 21 48 19.490 -34 57 04.73   12.86 13.87 11.57   ~ 387 0
28 NGC 7212 Sy2 22 07 01.9866638486 +10 14 00.849716443   15.1       ~ 164 1
29 NGC 7674 Sy2 23 27 56.6974755223 +08 46 44.238278540 13.84 13.92 13.23 12.64   ~ 643 4

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2020.10.31-12:43:33

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