2005A&A...441..451M


Query : 2005A&A...441..451M

2005A&A...441..451M - Astronomy and Astrophysics, volume 441, 451-464 (2005/10-2)

Near infra-red and optical colour gradients in E-type galaxies. Inferences on dust content.

MICHARD R.

Abstract (from CDS):

Colour gradients are considered for a sample of circa 50 E-type galaxies in the Local Supercluster. The new data includes isophotal colour profiles in J-H, J-K, V-J and V-K, measured using 2MASS frames mostly from the Large Galaxies Atlas, V frames from previous work and V profiles from the literature. This is supplemented by U-B, B-V, B-R, V-I colour gradients obtained anew from published photometric data. Colour gradients in E galaxies show remarkably large variations from object to object and do not correlate with other properties. Metallicity gradients are the primary cause as shown before. Age gradients with opposite effects are possibly needed to explain objects with small colour gradients. Some empirical evidence of such age effects has been found for a subset of objects with morphological peculiarities and younger stars mixed. Dust has only modest effects on colour gradients, as shown by the fact that objects with zero IRAS 100µ flux have the same average values of the gradients, except in V-J and V-K, as those with non zero flux (cf. Table 7). This last subsample however exhibits poor but definite correlations between IRAS flux and gradients, which might be caused by the presence of a few relatively dusty galaxies in the sample. Given the absence of a correlation between any gradients and galaxy velocity dispersion (and hence mass), the observations do not agree with the predictions of the monolithic scenario for the formation of E galaxies. Simulated datasets of ``dummy'' objects mimicking the hierarchical scenario have been obtained, and used to test a technique for estimating the dust content of E-galaxies from the comparison of the V-K (or V-J) colour gradients with the U-B (or B-V) ones: the contents of diffuse dust, gauged in terms of published models, are obtained for a dozen objects.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/441/451): photom.dat>

Simbad objects: 58

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Number of rows : 58
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 584 GiP 01 31 20.7231919800 -06 52 04.770287472 11.93 11.44 10.48     ~ 382 2
2 NGC 596 GiG 01 32 51.9046959816 -07 01 53.646821220   11.5       ~ 231 0
3 2E 0150.5-1358 ClG 01 53 00.40 -13 44 18.0           ~ 386 0
4 NGC 720 GiG 01 53 00.523 -13 44 19.25   12.4   10.36   ~ 504 0
5 NGC 821 G 02 08 21.1358498040 +10 59 41.832436704   12.210 11.310 10.739 9.744 ~ 556 0
6 NGC 1052 GiP 02 41 04.7997864552 -08 15 20.761481016 11.84 11.41 10.47 10.71   ~ 1233 2
7 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1515 1
8 NGC 1395 SyG 03 38 29.789 -23 01 39.69   10.71   8.99   ~ 268 0
9 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 715 1
10 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 556 1
11 NGC 1537 GiG 04 13 40.6728494904 -31 38 42.789379560   11.54   10.11   ~ 96 0
12 NGC 1549 GiP 04 15 45.223 -55 35 32.50 11.22 10.48 9.79 9.08   ~ 230 1
13 NGC 1600 GiG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 356 0
14 NGC 1700 GiG 04 56 56.3160873072 -04 51 56.794713228   12   11.14   ~ 340 1
15 NGC 2768 SyG 09 11 37.504 +60 02 13.95 11.30 10.84 9.87     ~ 486 2
16 NGC 2865 GiG 09 23 30.205 -23 09 41.37   12.39 11.43 11.06   ~ 233 0
17 NGC 2974 Sy2 09 42 33.2918467632 -03 41 57.038311068   12.19   10.77   ~ 424 0
18 NGC 2986 GiG 09 44 16.0193679072 -21 16 40.971622512   11.60 10.93 9.96   ~ 162 0
19 NGC 3115 GiG 10 05 13.9270507008 -07 43 06.982712292   11   9.37   ~ 975 2
20 NGC 3193 GiP 10 18 24.884 +21 53 38.32 12.29 11.83 10.88 12.19   ~ 279 1
21 NGC 3250 GiG 10 26 32.2832570136 -39 56 38.471500356   12.26 11.03 10.57   ~ 91 0
22 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 751 1
23 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1424 0
24 NGC 3557 rG 11 09 57.653 -37 32 21.02   11.50 10.40 9.79   ~ 266 2
25 NGC 3585 GiG 11 13 17.109 -26 45 17.96   10.64   9.22   ~ 271 0
26 NGC 3608 LIN 11 16 58.967 +18 08 54.71   11.7       ~ 493 0
27 NGC 3610 GiG 11 18 25.2827189856 +58 47 10.433735988   11.4       ~ 295 0
28 NGC 3923 GiG 11 51 01.783 -28 48 22.36 11.41 10.59 9.80 8.88   ~ 420 1
29 NGC 3962 LIN 11 54 40.0986420456 -13 58 30.234748836   13.16 12.16 11.15   ~ 148 0
30 NGC 4125 GiP 12 08 06.017 +65 10 26.88 11.14 10.65 9.72     ~ 411 2
31 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1174 0
32 NGC 4278 LIN 12 20 06.8253868 +29 16 50.713486 11.54 11.09 10.16     ~ 917 2
33 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 820 0
34 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1703 2
35 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1049 1
36 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 2029 2
37 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 623 1
38 NGC 4478 GiP 12 30 17.4160005576 +12 19 42.790577160 12.82 12.36 11.45   10.17 ~ 481 1
39 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6707 3
40 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 489 0
41 NGC 4494 GiP 12 31 24.0391348536 +25 46 30.071664120   10.55 9.74     ~ 462 0
42 M 89 LIN 12 35 39.8073444 +12 33 22.830809 11.29 10.73 9.75     ~ 962 2
43 NGC 4564 GiG 12 36 26.9869512504 +11 26 21.204472848 12.51 12.05 11.12     ~ 578 1
44 NGC 4589 LIN 12 37 24.9947272584 +74 11 30.861224124   12.0       ~ 275 1
45 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 675 0
46 NGC 4636 LIN 12 42 49.8333280080 +02 41 15.951929028   12.62 11.84     ~ 1077 1
47 M 60 GiP 12 43 39.9708251928 +11 33 09.688174056   10.3       ~ 1306 1
48 NGC 4660 GiP 12 44 31.9814021280 +11 11 25.739106972   12.1       ~ 408 0
49 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 835 0
50 NGC 4696 BiC 12 48 49.2724775784 -41 18 39.304053252   11.21   10.7   ~ 471 3
51 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 394 2
52 NGC 5576 GiP 14 21 03.691 +03 16 15.78 12.25 11.85 10.96     ~ 314 1
53 NGC 5813 LIN 15 01 11.2302420864 +01 42 07.141569696 12.00 11.45 10.46 10.06   ~ 608 1
54 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 817 1
55 M 102 SyG 15 06 29.561 +55 45 47.91 11.12 10.74 9.89     ~ 526 3
56 NGC 7144 GiG 21 52 42.4890937656 -48 15 13.729791132   11.87 10.71 10.39   ~ 146 1
57 IC 1459 GiP 22 57 10.6071797352 -36 27 43.992307260   10.96 11.85 9.34 10.3 ~ 602 2
58 NGC 7507 GiG 23 12 07.595 -28 32 22.70   11.60   9.98   ~ 171 0

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2022.08.18-03:36:27

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