2005ApJ...629..797G


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET07:58:56

2005ApJ...629..797G - Astrophys. J., 629, 797-815 (2005/August-3)

The vertical stellar kinematics in face-on barred galaxies: estimating the ages of bars.

GADOTTI D.A. and DE SOUZA R.E.

Abstract (from CDS):

In order to perform a detailed study of the stellar kinematics in the vertical axis of bars, we obtained high signal-to-noise spectra along the major and minor axes of the bars in a sample of 14 face-on galaxies and used them to determine the line-of-sight stellar velocity distribution, parameterized as a Gauss-Hermite series. With these data, we developed a diagnostic tool that allows one to distinguish between recently formed and evolved bars, as well as to estimate their ages, assuming that bars form in vertically thin disks that are recognizable by low values for the vertical velocity dispersion σz. Through N-body realizations of bar unstable disk galaxies we were also able to check the timescales involved in the processes that give bars an important vertical structure. We show that σzin evolved bars is roughly 100 km/s, which translates to a height scale of about 1.4 kpc, giving support to scenarios in which bulges form through disk material. Furthermore, the bars in our numerical simulations have values for σzgenerally smaller than 50 km/s, even after evolving for 2 Gyr, suggesting that a slow process is responsible for making bars as vertically thick as we observe. We verify theoretically that the Spitzer-Schwarzschild mechanism is quantitatively able to explain these observations if we assume that giant molecular clouds are twice as concentrated along the bar as in the rest of the disk.

Abstract Copyright:

Journal keyword(s): Galaxies: Bulges - Galaxies: Evolution - Galaxies: Formation - Galaxies: Kinematics and Dynamics - Methods: {em n}-Body Simulations

Simbad objects: 51

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Number of rows : 51

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 210 GiP 00 40 34.9915408968 -13 52 21.998215700   11.8   11.00 11.4 ~ 161 0
2 NGC 488 GiG 01 21 46.848 +05 15 24.19   15.0       ~ 281 0
3 NGC 1302 GiG 03 19 51.2028576345 -26 03 37.942953768   11.43   9.99 10.8 ~ 136 0
4 NGC 1317 GiP 03 22 44.2812268852 -37 06 13.162532124 12.20 11.78 11.02 10.22   ~ 184 1
5 NGC 1326 GiG 03 23 56.397 -36 27 52.78 11.69 11.43 10.54 10.02 10.9 ~ 240 1
6 NGC 1387 GiP 03 36 57.0325944947 -35 30 23.691986124 12.18 11.75 10.69 10.16   ~ 222 1
7 NGC 1440 GiG 03 45 02.904 -18 15 57.76   12.48   10.77   ~ 74 0
8 * pi.02 Ori * 04 50 36.7229825 +08 54 00.649333 4.39 4.36 4.35 4.29 4.29 A1Vn 164 0
9 * b Ori PM* 05 42 28.6323987683 +01 28 28.671374058 7.13 6.07 4.90 4.02 3.41 K1III 135 0
10 * mu. Col V* 05 45 59.8953630749 -32 18 23.164726112 3.84 4.90 5.18 5.30 5.57 O9.5V 462 0
11 * nu.02 CMa PM* 06 36 41.0375756 -19 15 21.165905 5.96 5.011 3.91 3.13 2.61 K1.5III-IVFe1 244 1
12 * tet CMa PM* 06 54 11.3997692336 -12 02 19.061054441 7.20 5.51 4.08 2.95 2.17 K3/4III 208 0
13 * G CMi PM* 08 02 15.9365899 +02 20 04.452198 6.91 5.63 4.38 3.39 2.72 K2IIIbFe-0.5: 171 1
14 HD 71597 * 08 28 14.5571373588 +00 14 38.191885908   8.47 7.29     K1IV 43 0
15 * eta Hya bC* 08 43 13.4749927 +03 23 55.186711 3.380 4.100 4.300 4.37 4.56 B3V 386 1
16 NGC 2665 EmG 08 46 00.981 -19 18 10.53   12.9   12.28 12.4 ~ 51 0
17 NGC 2985 Sy1 09 50 22.233 +72 16 43.13   11.37 10.61     ~ 227 1
18 NGC 3054 GiG 09 54 28.605 -25 42 12.37   12.27   10.92 11.4 ~ 134 0
19 * 20 LMi PM* 10 01 00.6567799273 +31 55 25.216848499   6.02   4.9   G3VaHdel1 353 0
20 * 40 Leo dS* 10 19 44.1668778 +19 28 15.294314   5.24   4.5   F6IV-V 249 0
21 HD 90861 * 10 29 53.6916938188 +28 34 52.393943111   8.01 6.90     K2III 49 0
22 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 612 0
23 * 33 Sex PM* 10 41 24.1859207379 -01 44 29.366215211   7.145 6.250     G9IV 153 0
24 NGC 3412 GiG 10 50 53.313 +13 24 43.71 11.84 11.45 10.54     ~ 221 1
25 * 56 Leo LP? 10 56 01.4689991 +06 11 07.327524 8.45 7.24 5.78 3.53 1.44 M5.5III: 161 0
26 NGC 3941 Sy2 11 52 55.360 +36 59 10.96   11.45 11.62 9.97   ~ 227 0
27 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 389 0
28 NGC 4314 LIN 12 22 31.978 +29 53 43.09 11.72 11.43 10.58     ~ 453 1
29 NGC 4394 GiP 12 25 55.6370604801 +18 12 50.115665445   11.9       ~ 336 0
30 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 980 2
31 NGC 4608 GiP 12 41 13.2831566199 +10 09 20.342721675   12.6       ~ 179 0
32 NGC 4754 GiP 12 52 17.563 +11 18 49.18   11.6       ~ 265 0
33 NGC 4984 GiG 13 08 57.213 -15 30 58.67   12   10.92   ~ 117 0
34 * 55 Vir PM* 13 14 10.8958308887 -19 55 51.410166108   6.20 5.33     G7IV 112 0
35 * 61 Vir PM* 13 18 24.3142756 -18 18 40.304648 5.710 5.440 4.740     G6.5V 599 1
36 NGC 5383 GiG 13 57 04.975 +41 50 46.60   12.5   10.95   ~ 315 0
37 NGC 5701 GiG 14 39 11.0762411300 +05 21 48.498854025 12.03 11.76 10.88     ~ 224 1
38 HD 131977 BY* 14 57 28.0008928545 -21 24 55.726897561 7.89 6.83 5.72 4.74 4.19 K4V 450 0
39 NGC 5850 LIN 15 07 07.676 +01 32 39.41   11.5   10.79 11.1 ~ 281 1
40 HD 134439 PM* 15 10 13.0874231858 -16 22 45.866399625 10.03 9.837 9.066 8.604 8.160 sd:K1Fe-1 301 0
41 * 5 Ser Ro* 15 19 18.79710 +01 45 55.4685   5.60   4.8   F8IV 322 0
42 HD 155500 * 17 11 45.2389277926 +07 53 41.143748138   7.380 6.333     K0III 31 0
43 * w Her PM* 17 20 39.5675395123 +32 28 03.877348066 6.08 6.01 5.39 4.89 4.56 G0V 424 0
44 * 89 Her pA* 17 55 25.1884459710 +26 02 59.970100296 5.36 5.70 5.36 5.06 4.94 F2Ibp 388 0
45 * b Her SB* 18 07 01.53971 +30 33 43.6896 5.52 5.59 5.07 4.61 4.28 F7VgF7mF5 419 0
46 * 71 Oph * 18 07 18.3588843509 +08 44 01.918091638   5.592 4.640     G8III 164 0
47 HD 166620 PM* 18 09 37.4162810870 +38 27 27.995921559 7.86 7.27 6.40 5.63 5.14 K2V 395 0
48 * 106 Her PM* 18 20 17.9148178278 +21 57 40.662235772 8.54 6.54 4.96 3.62 2.62 M1III 91 0
49 HD 172401 SB* 18 39 39.6821226968 +08 43 58.123824760   8.08 7.01     K0III 27 0
50 NGC 6878 GiG 20 13 53.218 -44 31 36.10   13.65 12.42 12.25   ~ 38 0
51 NGC 7412 GiG 22 55 45.7651763342 -42 38 31.058747966   11.82 11.38 12.0 11.4 ~ 106 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-07:58:56

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