2000A&A...360...85M


Query : 2000A&A...360...85M

2000A&A...360...85M - Astronomy and Astrophysics, volume 360, 85-91 (2000/8-1)

Colour distributions in E-S0 galaxies. VI. A discussion of colour gradients in ellipticals.

MICHARD R.

Abstract (from CDS):

The data from the surveys by Franx et al. (1989AJ.....98..538F), Peletier et al. (1990AJ....100.1091P), Goudfrooij et al. (1994A&AS..104..179G), completed by our own measurements, have been used to build a sample of ellipticals with the full array of U-B, B-V, B-R and V-I colours, and corresponding gradients. A number of objects with data for only 3 colours are also considered. Photometric profiles were re-calibrated in a coherent colours system, and a seemingly successful attempt was made to improve gradients by minor corrections to adopted sky background values. ``External" probable errors are obtained for the revised data by comparisons between the various sources. These have poor statistical weight in U-B and V-I. An ad hoc ``standard" gradient Δs is defined as a weighted average of the four gradients in the above listed colours (or only three). The correlations of the various gradients to Δs are considered, and their slopes ΔU–Bs,... are compared to the corresponding calculated ratios for current hypothesis regarding the origin of colour gradients in ellipticals, i.e. population gradients and large scale dust distributions. Both the ratios for the U-B and V-I colours are not compatible with the explanation in terms of diffuse dust but tend to agree with the explanation in terms of metallicity variations. The correlation between the gradient ΔU–B and the standard one Δs might be worse than could be explained by observational errors. Both population variations and possibly complex dust dustributions should be invoked to explain the complications of colour gradients.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters

Simbad objects: 39

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Number of rows : 39
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 596 GiG 01 32 51.9046959816 -07 01 53.646821220   11.5       ~ 230 0
2 2E 0150.5-1358 ClG 01 53 00.40 -13 44 18.0           ~ 386 0
3 NGC 720 GiG 01 53 00.523 -13 44 19.25   12.4   10.36   ~ 500 0
4 NGC 821 G 02 08 21.1358498040 +10 59 41.832436704   12.210 11.310 10.739 9.744 ~ 555 0
5 NGC 1052 GiP 02 41 04.7997864552 -08 15 20.761481016 11.84 11.41 10.47 10.71   ~ 1225 2
6 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1510 1
7 NGC 1395 SyG 03 38 29.789 -23 01 39.69   10.71   8.99   ~ 264 0
8 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 705 1
9 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 551 1
10 NGC 1549 GiP 04 15 45.223 -55 35 32.50 11.22 10.48 9.79 9.08   ~ 229 1
11 NGC 1600 GiG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 353 0
12 NGC 1700 GiG 04 56 56.3160873072 -04 51 56.794713228   12   11.14   ~ 337 1
13 NGC 2300 IG 07 32 20.486 +85 42 31.90   12.2       ~ 325 0
14 NGC 2768 SyG 09 11 37.504 +60 02 13.95 11.30 10.84 9.87     ~ 483 2
15 NGC 2974 Sy2 09 42 33.2918467632 -03 41 57.038311068   12.19   10.77   ~ 423 0
16 NGC 2986 GiG 09 44 16.0193679072 -21 16 40.971622512   11.60 10.93 9.96   ~ 161 0
17 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 748 1
18 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1417 0
19 NGC 3605 GiG 11 16 46.5896102400 +18 01 01.777666908   12.7       ~ 249 0
20 NGC 3608 LIN 11 16 58.967 +18 08 54.71   11.7       ~ 491 0
21 NGC 3610 GiG 11 18 25.2827189856 +58 47 10.433735988   11.4       ~ 294 0
22 NGC 3613 GiG 11 18 36.130 +57 59 59.73   11.6       ~ 201 0
23 NGC 3665 rG 11 24 43.630 +38 45 46.05 13.71 13.26 11.62     ~ 320 1
24 NGC 4125 GiP 12 08 06.017 +65 10 26.88 11.14 10.65 9.72     ~ 408 2
25 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1167 0
26 NGC 4278 LIN 12 20 06.8253868 +29 16 50.713486 11.54 11.09 10.16     ~ 915 2
27 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1694 2
28 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1044 1
29 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 2022 2
30 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6645 3
31 NGC 4494 GiP 12 31 24.0391348536 +25 46 30.071664120   10.55 9.74     ~ 459 0
32 NGC 4564 GiG 12 36 26.9869512504 +11 26 21.204472848 12.51 12.05 11.12     ~ 576 1
33 NAME NGC 4636 Group GrG 12 42 49.5 +02 41 08           ~ 556 0
34 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1071 1
35 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 831 0
36 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 392 2
37 NGC 5813 LIN 15 01 11.2302420864 +01 42 07.141569696 12.00 11.45 10.46 10.06   ~ 604 1
38 NGC 7144 GiG 21 52 42.4890937656 -48 15 13.729791132   11.87 10.71 10.39   ~ 145 1
39 IC 1459 GiP 22 57 10.6071797352 -36 27 43.992307260   10.96 11.85 9.34 10.3 ~ 599 2

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2022.05.24-02:03:13

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