2001MNRAS.323..130C

Query : 2001MNRAS.323..130C

2001MNRAS.323..130C - Mon. Not. R. Astron. Soc., 323, 130-146 (2001/May-1)

Disc scalelengths of non-active and active spiral galaxies.

CUNOW B.

Abstract (from CDS):

Disc scalelengths rD are determined for a sample of 32 non-active and 28 active spiral galaxies from optical CCD images. For 21 of the 32 non-active galaxies and 20 of the 28 active galaxies B, V, R and I data have been obtained, while for the remaining galaxies only B and I images have been taken. For 18 of the 21 non-active galaxies, which are measured in all four passbands, rD decreases systematically from B to I, whereas such a decrease is found for only four of the 20 active galaxies with BVRI data. For the non-active galaxies, the ratios rD(B)/rD(I), rD(V)/rD(I) and rD(R)/rD(I) increase systematically with increasing apparent ellipticity ε of the galaxies. For the active galaxies, no systematic variation of any of the ratios with increasing ε is found.

The variation of rD(B)/rD(I) with ε is compared with model calculations. For the non-active galaxies, the data are represented best by a model with a stellar disc that has an intrinsic colour gradient and with a central optical depth in the B band for face-on view of τ0B=3.

For the active galaxies, the best agreement between data and models is found for models with a stellar disc with no intrinsic colour gradient and no dust. The best-fitting model for the non-active galaxies does not reproduce the data of the active galaxies.

The main conclusion of this work is that structural differences seem to exist between the discs of non-active and active galaxies. The non-active galaxies show significant colour gradients within their discs, whereas the active galaxies do not. These gradients are probably caused by a combination of an intrinsic colour gradient within the stellar disc, and dust extinction. Furthermore, the measurements indicate that the non-active galaxies show significant dust extinction in the centre, but they are optically thin in the outer regions. The active galaxies do not seem to have intrinsic colour gradients within the stellar disc and they are optically thin throughout the disc.


Abstract Copyright: The Royal Astronomical Society

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

Simbad objects: 64

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Number of rows : 64
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ESO 293-27 EmG 00 00 29.485 -40 29 04.07   14.40   13.40 13.9 ~ 26 0
2 NGC 115 LSB 00 26 46.278 -33 40 37.56   13.73   12.85 13.5 ~ 72 1
3 ESO 411-17 G 00 47 55.5266227440 -29 12 21.695007420   15.73 14.21 14.27   ~ 15 0
4 ESO 351-10 Sy2 00 49 49.7499497736 -35 20 03.476077872   16.08   14.50   ~ 13 0
5 ESO 411-23 EmG 00 50 45.709 -30 24 59.65   15.71   14.97   ~ 9 0
6 ESO 351-18 EmG 00 53 48.979 -33 17 42.82   15.054   14.494   ~ 29 0
7 ESO 351-22 EmG 00 55 06.5670993912 -36 39 25.087294224   15.56   14.35   ~ 8 0
8 ESO 351-24 EmG 00 57 11.5954382112 -36 35 30.235040340   16.07   14.61   ~ 12 0
9 ESO 351-25 Sy2 00 58 22.3206891648 -36 39 36.857199132   15.28 15.12 13.93   ~ 26 0
10 ESO 351-31 EmG 01 00 59.9474816616 -35 14 32.799982416   15.43   14.02   ~ 16 0
11 ESO 352-11 G 01 09 16.349 -32 23 10.64   15.96   14.49   ~ 21 0
12 ESO 412-15 Sy2 01 12 49.854 -31 12 02.01   15.470   14.458   ~ 40 0
13 ESO 352-21 EmG 01 13 07.4150530776 -34 00 55.547797428   15.29   14.07   ~ 17 0
14 ESO 412-21 Sy1 01 14 29.7386403840 -31 10 53.412506112   14.89   13.51   ~ 46 0
15 ESO 352-54 EmG 01 21 29.6395250928 -36 32 34.903719744   15.19   13.80   ~ 23 0
16 ESO 412-27 EmG 01 22 32.7199426392 -29 58 57.021651696   15.709   14.351   ~ 24 0
17 ESO 352-59 AG? 01 22 42.945 -34 39 14.07   15.91   15.38   ~ 9 0
18 ESO 352-72 EmG 01 25 12.6739301232 -35 48 59.367383892   15.12   13.85   ~ 26 0
19 ESO 353-9 Sy2 01 31 50.4211828920 -33 07 09.672692880   13.69 13.7 12.21 13.6 ~ 62 1
20 ESO 80-5 Sy1 01 47 39.2844124056 -66 09 47.480948676   16.05 16.0 14.57   ~ 17 0
21 ESO 153-20 Sy2 02 06 03.4672137720 -55 11 36.873277656   14.06 14.31 12.67 13.3 ~ 59 0
22 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1667 2
23 NGC 973 Sy2 02 34 20.101 +32 30 20.01   13.7   9.8   ~ 140 0
24 NGC 985 Sy1 02 34 37.882 -08 47 17.02   14.64 14.28 12.9   ~ 412 0
25 NGC 1241 Sy2 03 11 14.6195456232 -08 55 18.775959888 12.07 12.84 11.99 12.7 12.5 ~ 210 2
26 IC 1913 EmG 03 19 34.578 -32 27 54.41   14.38   13.54 14.2 ~ 74 0
27 NGC 1519 Sy1 04 08 07.591 -17 11 34.46   13.73   12.70   ~ 69 0
28 ESO 201-21 AG? 04 08 40.2629595096 -49 34 59.215206720   14.37       ~ 23 0
29 NGC 1591 Sy1 04 29 30.5379132408 -26 42 47.240666424   13.77   12.62   ~ 59 0
30 NGC 1667 Sy2 04 48 37.1804579280 -06 19 11.824427712   13.66 12.86 11.72   ~ 364 1
31 ESO 422-23 EmG 05 02 17.7323771904 -30 27 17.226546552   14.18   13.07   ~ 34 0
32 ESO 122-1 Sy2 06 40 43.2449894064 -58 31 28.550587044   13.14   11.47 12.7 ~ 43 0
33 ESO 373-13 Sy2 09 38 20.464 -33 51 45.84   15.36   13.90   ~ 32 0
34 NGC 2989 Sy2 09 45 25.225 -18 22 25.96   13.51 14.50 12.46 12.9 ~ 89 0
35 ESO 263-13 Sy2 10 09 48.1876712664 -42 48 40.530472560   14.94 14.95 13.29   ~ 104 0
36 ESO 504-13 SyG 11 43 20.7875204808 -27 36 00.647279784   15.62 15.86 14.37   ~ 21 0
37 NGC 4700 AGN 12 49 08.148 -11 24 35.48   12.7 14.32 12.7 12.5 ~ 99 0
38 NGC 4785 Sy2 12 53 27.3416048448 -48 44 57.213423456   13.22 12.09 12.8 12.5 ~ 69 0
39 IC 4253 Sy2 13 27 32.3651182176 -27 52 19.532657676   14.82   13.83 13.69 ~ 32 0
40 NGC 5757 Sy1 14 47 46.3913128392 -19 04 42.159319464   12.77 13.73 11.52 12.2 ~ 114 0
41 IC 4729 Sy2 18 39 56.4717963696 -67 25 32.588497524   13.59   11.84 13.0 ~ 50 0
42 ESO 140-43 Sy1 18 44 53.9892878664 -62 21 52.874216640   14.14 14.10 12.94 13.1 ~ 244 0
43 ESO 25-2 Sy1 18 54 40.2641097576 -78 53 54.106126548   14.60 14.5 13.08 13.9 ~ 63 0
44 ESO 339-12 Sy2 19 58 30.8999594352 -40 48 55.950767388   13.76   12.70   ~ 17 0
45 NGC 6860 Sy2 20 08 46.8865940304 -61 05 59.782024608   13.70 13.53 12.14   ~ 178 0
46 NGC 6890 Sy2 20 18 18.1057797216 -44 48 24.750633168   13.06 14.02 11.57   ~ 164 0
47 ESO 462-9 Sy2 20 21 51.5561670184 -31 17 23.020333239   14.67   13.30   ~ 32 0
48 NGC 6926 Sy2 20 33 06.1084582704 -02 01 38.498909376   14.87 13.87 13.0 12.5 ~ 156 2
49 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2527 2
50 IC 5039 EmG 20 43 14.3138782056 -29 51 12.017059236   13.45 12.60 12.28   ~ 67 0
51 NGC 6970 Sy1 20 52 09.4601778264 -48 46 40.049246064   13.16 12.68 11.99   ~ 42 0
52 ESO 342-46 EmG 21 26 00.1911189648 -40 50 05.076258216   13.73   12.68 13.2 ~ 38 0
53 ESO 288-25 Sy2 21 59 17.8140093336 -43 52 01.109469720   13.97   12.67   ~ 53 0
54 NGC 7214 Sy1 22 09 07.6631604816 -27 48 34.160960772   12.48 14.10 11.40   ~ 138 0
55 ESO 602-31 Sy1 22 36 55.9476942792 -22 13 15.048349248   14.33 13.90 13.41   ~ 42 0
56 NGC 7378 Sy2 22 47 47.6930804328 -11 48 59.863364316   13   12.74   ~ 59 0
57 NGC 7462 GiG 23 02 46.494 -40 50 06.71   12.07   11.27 12.1 ~ 97 0
58 NGC 7469 Sy1 23 03 15.6 +08 52 26 12.60 13.00 12.34     ~ 2095 3
59 ESO 469-15 EmG 23 08 55.613 -30 51 28.43   14.75   13.75 14.2 ~ 64 1
60 NGC 7591 SyG 23 18 16.2727927344 +06 35 09.108933504   13.8       ~ 269 0
61 NGC 7590 Sy1 23 18 54.7949760192 -42 14 20.515300476   12.12 13.76 11.06 11.8 ~ 277 1
62 ESO 292-9 Sy2 23 40 24.3060159528 -44 30 51.827745456   14.61   13.34   ~ 30 1
63 NGC 7734 Sy2 23 42 42.9369031704 -65 56 40.927089876   13.95   12.56   ~ 34 1
64 IC 1524 Sy1 23 59 10.7275606392 -04 07 37.061295744   17.8   12.61   ~ 39 1

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