1999MNRAS.309..623F

Query : 1999MNRAS.309..623F

1999MNRAS.309..623F - Mon. Not. R. Astron. Soc., 309, 623-628 (1999/November-1)

On the relationship between age and dynamics in elliptical galaxies.

FORBES D.A. and PONMAN T.J.

Abstract (from CDS):

Galaxy age estimates (mostly from spectroscopy of the central regions) are now available for many early-type galaxies. In a previous paper we showed that the offset of galaxies from the fundamental plane depends on galaxy age.

Here, using the same sample of 88 galaxies, we examine the scatter about the Faber-Jackson (FJ) relation, and find that the position of a galaxy relative to this relation depends on its age. In particular, younger ellipticals are systematically brighter in MB and/or have a lower central velocity dispersion (σ0). The mean relation corresponds to galaxies that are ∼10Gyr old.

We attempt to reproduce the observed trend of the FJ residuals with age using two simple models. The first assumes that galaxy age is tracing the last major star formation event in an elliptical galaxy. We assume that this starburst was instantaneous, centrally located and involved 10per cent of the galaxy by mass. The fading of this burst changes the MB component of the FJ residuals, with time. Such a model was very successful at reproducing the B-V and Mg2 evolution reported in our previous paper, but is unable to reproduce the strength of the FJ trend. A second model is required to describe age-correlated changes in galaxy dynamics. Following expectations from cosmological simulations, we assume that σ0, for a galaxy of a given mass, scales with the epoch of galaxy formation, i.e. with the mean density of the Universe. Hence recently formed ellipticals have systematically lower velocity dispersions than do old ellipticals. We find that a combination of these two models provides a good match to the change in FJ residuals with galaxy age. This suggests that young ellipticals will have subtly different dynamical properties from old ellipticals.

We also find that there is not a strong relationship between the age of a galaxy and its luminosity for our sample. This suggests that the tilt of the fundamental plane is not totally driven by age.


Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: kinematics and dynamics - galaxies: photometry

Simbad objects: 94

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Number of rows : 94
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 NGC 315 LIN 00 57 48.88334410 +30 21 08.8119345 12.80 12.20 11.16 11.26   ~ 869 2
2 NGC 474 GiP 01 20 06.6870520512 +03 24 55.861973100 12.75 12.37 11.51 11.42 10.56 ~ 371 1
3 NGC 507 rG 01 23 39.950 +33 15 22.22   13.0       ~ 459 1
4 NGC 547 rG 01 26 00.6208982520 -01 20 42.432452268   13.16 13.34     ~ 363 4
5 NGC 584 Sy2 01 31 20.7231919800 -06 52 04.770287472 11.93 11.44 10.48     ~ 417 2
6 NGC 596 GiG 01 32 51.9046959816 -07 01 53.646821220   11.5       ~ 247 0
7 NGC 636 EmG 01 39 06.5293238064 -07 30 45.475975296   12.5       ~ 196 0
8 BAX 028.2522-13.7387 ClG 01 53 00.40 -13 44 18.0           ~ 389 0
9 NGC 720 Sy1 01 53 00.523 -13 44 19.25   12.4   10.36   ~ 536 0
10 NGC 821 AG? 02 08 21.1358498040 +10 59 41.832436704   12.210 11.310 10.739 9.744 ~ 592 0
11 NGC 1052 Bla 02 41 04.79849989 -08 15 20.7519527 11.84 11.41 10.47 10.71   ~ 1397 2
12 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
13 NGC 1336 GiG 03 26 32.1845365512 -35 42 48.662672184   13.12   11.95   ~ 150 0
14 NGC 1339 EmG 03 28 06.5493649512 -32 17 09.840527844   12.63   11.18   ~ 171 0
15 NGC 1351 GiG 03 30 34.9598617824 -34 51 14.242996620   12.30   10.85   ~ 190 0
16 NGC 1374 EmG 03 35 16.5885737352 -35 13 34.563417168 12.46 11.97 11.08 10.59   ~ 322 1
17 NGC 1375 GiG 03 35 16.8025873104 -35 15 56.371399740 13.50 13.02 12.40 11.74   ~ 175 1
18 NGC 1379 GiP 03 36 03.9668625792 -35 26 28.547476800 12.17 12.04 10.91 10.60   ~ 277 1
19 NGC 1380 Sy2 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 460 1
20 NGC 1381 GiP 03 36 31.6592184144 -35 17 42.739221912 12.90 12.47 11.50 11.02   ~ 269 1
21 NGC 1380A GiG 03 36 47.5007323848 -34 44 22.739259552 13.63 13.36 12.41 12.00   ~ 156 1
22 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
23 NGC 1404 rG 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 787 1
24 NGC 1419 GiG 03 40 42.1036600944 -37 30 38.778564456   13.56   12.07   ~ 146 0
25 NGC 1427 GiG 03 42 19.4455150392 -35 23 33.169251120   11.89   10.44   ~ 298 0
26 NGC 1453 EmG 03 46 27.2307890592 -03 58 07.831476768   13   11.30   ~ 189 0
27 IC 2006 EmG 03 54 28.4628183240 -35 58 01.673622516   12.39   10.94 11.9 ~ 217 0
28 NGC 1600 rG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 409 1
29 NGC 1700 EmG 04 56 56.3160873072 -04 51 56.794713228   12   11.14   ~ 356 1
30 NGC 2300 AG? 07 32 20.486 +85 42 31.90   12.2       ~ 346 0
31 NGC 2549 AG? 08 18 58.3507032336 +57 48 11.022298740   12.1       ~ 271 0
32 NGC 2685 Sy2 08 55 34.7027817000 +58 44 03.876540108   13.68 12.70     ~ 459 1
33 NGC 2768 SyG 09 11 37.504 +60 02 13.95 11.30 10.84 9.87     ~ 526 2
34 NGC 2778 GiP 09 12 24.3741783168 +35 01 39.140496840   13.1       ~ 303 0
35 NGC 2732 GiP 09 13 24.6918628128 +79 11 14.150547096   12.6       ~ 77 0
36 NGC 2865 GiG 09 23 30.205 -23 09 41.37   12.39 11.43 11.06   ~ 244 0
37 NGC 2911 Sy2 09 33 46.10739467 +10 09 08.8215304   14.96 13.83     ~ 259 0
38 NGC 2974 Sy2 09 42 33.2918467632 -03 41 57.038311068   12.19   10.77   ~ 463 0
39 NGC 3156 GiG 10 12 41.2457368824 +03 07 45.701284764   12.8       ~ 241 0
40 NGC 3193 GiP 10 18 24.884 +21 53 38.32 12.29 11.83 10.88 12.19   ~ 301 1
41 NGC 3226 rG 10 23 27.0064075320 +19 53 54.674937420   14.32 13.33     ~ 440 1
42 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 798 1
43 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1504 0
44 NGC 3489 GiG 11 00 18.5483994744 +13 54 04.206202668 11.46 11.12 10.29     ~ 429 1
45 NGC 3605 GiG 11 16 46.5896102400 +18 01 01.777666908   12.7       ~ 261 0
46 NGC 3607 Sy2 11 16 54.65687 +18 03 06.5120   13.84 12.76     ~ 490 1
47 NGC 3608 LIN 11 16 58.967 +18 08 54.71   11.7       ~ 527 0
48 NGC 3610 GiG 11 18 25.2827189856 +58 47 10.433735988   11.4       ~ 327 0
49 NGC 3640 GiG 11 21 06.852 +03 14 05.15 11.89 11.36 10.44     ~ 291 3
50 NGC 3818 EmG 11 41 57.3563891040 -06 09 20.459153376   13   11.78   ~ 186 0
51 NGC 3921 LIN 11 51 06.8803989360 +55 04 43.414457484   13.4 12.64     ~ 260 1
52 NGC 3998 Sy2 11 57 56.1334044408 +55 27 12.922443432   11.64 12.10 10.09   ~ 682 2
53 NGC 4111 LIN 12 07 03.1334091672 +43 03 56.345868252 12.07 11.63 10.74     ~ 350 1
54 NGC 4125 GiP 12 08 06.017 +65 10 26.88 11.14 10.65 9.72     ~ 448 2
55 NGC 4168 Sy2 12 12 17.2692381408 +13 12 18.688208724 12.58 12.11 11.18     ~ 393 1
56 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1290 0
57 NGC 4278 LIN 12 20 06.8242 +29 16 50.722 11.54 11.09 10.16     ~ 988 2
58 NGC 4283 GiG 12 20 20.7691223880 +29 18 39.154727556 13.47 13.00 12.07     ~ 209 1
59 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1841 2
60 M 85 GiP 12 25 24.053 +18 11 27.89   10.2       ~ 678 0
61 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
62 NGC 4478 GiP 12 30 17.4160005576 +12 19 42.790577160 12.82 12.36 11.45   10.17 ~ 508 1
63 NGC 4489 GiG 12 30 52.2472748976 +16 45 31.866359004   13.2       ~ 264 0
64 M 89 Sy2 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 1037 2
65 M 60 GiC 12 43 39.9708251934 +11 33 09.688174067   10.3       ~ 1395 1
66 NGC 4660 GiP 12 44 31.9814021280 +11 11 25.739106972   12.1       ~ 434 0
67 NGC 4697 GiG 12 48 35.8981498824 -05 48 02.482374564   10.97   9.83   ~ 895 0
68 NGC 4816 GiG 12 56 12.1508733240 +27 44 43.773192276 14.25 13.80 12.84     ~ 145 1
69 IC 4051 EmG 13 00 54.4630403184 +28 00 27.502143300 15.04 14.8 13.50 13.003 12.305 ~ 218 0
70 NGC 4915 EmG 13 01 28.228 -04 32 47.04   14   11.86   ~ 81 0
71 NGC 5018 GiP 13 13 01.0452720960 -19 31 05.649751992   11.71   10.31   ~ 335 1
72 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 432 2
73 NGC 5485 LIN 14 07 11.3594809920 +55 00 06.084219996 14.34 13.82 12.22     ~ 267 0
74 NGC 5557 GiG 14 18 25.708 +36 29 37.28   12.2       ~ 237 0
75 NGC 5576 GiP 14 21 03.691 +03 16 15.78 12.25 11.85 10.96     ~ 347 1
76 NGC 5638 GiP 14 29 40.3717451400 +03 13 59.987811648 12.57 12.14 11.20     ~ 252 2
77 NGC 5812 EmG 15 00 55.708 -07 27 26.33   12   11.19   ~ 164 0
78 NGC 5813 LIN 15 01 11.2302420864 +01 42 07.141569696 12.00 11.45 10.46 10.06   ~ 673 2
79 NGC 5831 GiG 15 04 07.0002600408 +01 13 11.705607012   13.1   11.19   ~ 304 0
80 NGC 5846 rG 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 891 2
81 NGC 5982 LIN 15 38 39.778 +59 21 21.21   12.4       ~ 302 0
82 NGC 6125 AG? 16 19 11.5344941208 +57 59 02.863041504   13.0       ~ 106 0
83 NGC 6702 AG? 18 46 57.5835209136 +45 42 20.305242180 15.30 14.73 13.05     ~ 148 0
84 NGC 6703 AG? 18 47 18.8166660360 +45 33 02.274865812   12.29 11.34     ~ 225 0
85 NGC 7252 AGN 22 20 44.7748209648 -24 40 41.909518200 12.26 12.46 12.06 11.57   ~ 720 1
86 NGC 7332 GiP 22 37 24.5373044952 +23 47 53.830708800   12.0       ~ 391 0
87 NGC 7457 AG? 23 00 59.9263288440 +30 08 41.764398792   11.04 11.87     ~ 459 0
88 NGC 7454 GiG 23 01 06.5120307216 +16 23 18.484008792   13.6       ~ 157 0
89 NGC 7562 GiP 23 15 57.4982037648 +06 41 15.227839176   13.0       ~ 173 0
90 NGC 7585 AG? 23 18 01.348 -04 39 01.07   12.46 18.7 11.23   ~ 106 0
91 NGC 7600 AG? 23 18 53.8425354720 -07 34 49.679666040   13   11.68   ~ 74 0
92 NGC 7619 GiG 23 20 14.524 +08 12 22.63   12.7       ~ 472 0
93 NGC 7626 rG 23 20 42.524 +08 13 01.43   12.8       ~ 438 1
94 NGC 7785 AG? 23 55 19.0388560224 +05 54 56.735224164   13.00       ~ 179 1

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