2003MNRAS.339..189Y


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST11:27:35

2003MNRAS.339..189Y - Mon. Not. R. Astron. Soc., 339, 189-211 (2003/February-2)

Stellar collisions in galactic centres: black hole growth and colour gradients.

YU Q.

Abstract (from CDS):

We study the effects of stellar collisions, particularly on feeding massive black holes (BHs) and colour gradients, in realistic galactic centres. We find that the mass released by stellar collisions is not sufficient to account for the present BH mass in galactic centres, especially in bright galaxies. This study, together with the study by Magorrian & Tremaine on tidal disruption of stars by massive BHs, implies that the material for BH growth (especially in galaxies brighter than ∼109 L) can only come from other sources, for example, the mass released by stellar evolution in the initial ∼1 Gyr of the lifetime of the galaxy, or the gas that sinks to the galactic centre in a galaxy merger. We also analyse how the colour of a stellar system is affected by collisions of stars. We find that collisions between main-sequence stars cannot cause observable colour gradients in the visible bands at projected radius R ≳ 0.1 arcsec in M31, M32 and other nearby galactic centres. This result is consistent with the lack of an observable colour gradient in M32 at R ≳ 0.1 arcsec. At even smaller radii, the colour differences caused by collisions between main-sequence stars are at most 0.08 mag at R = 0.02 arcsec. The averaged bluing caused by stellar collisions in the region R < 0.1 arcsec of M32 should not be larger than 0.06 mag in colour index U -V and 0.02 mag in V -I. The observed bluing in the centre of the galaxy M31 (in a 0.14x0.14arcsec2 box) must be caused by some mechanism other than collisions between main-sequence stars.

Abstract Copyright: RAS

Journal keyword(s): black hole physics - blue stragglers - galaxies: individual: M31 - galaxies: individual: M32 - galaxies: kinematics and dynamics - galaxies: photometry

Simbad objects: 35

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Number of rows : 35

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 M 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2038 2
2 HD 3969 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11271 1
3 NGC 596 GiG 01 32 51.906 -07 01 53.54   11.5       ~ 230 0
4 2E 0150.5-1358 ClG 01 53 00.40 -13 44 18.0           ~ 386 0
5 NGC 720 GiG 01 53 00.523 -13 44 19.25   12.4   10.36   ~ 494 0
6 NGC 1172 GiP 03 01 36.0614957678 -14 50 11.496465651   12.87       ~ 139 0
7 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1475 1
8 NGC 1426 GiG 03 42 49.0995354501 -22 06 30.172682100   12.21 11.44 10.90   ~ 185 0
9 NGC 1600 GiG 04 31 39.858 -05 05 09.97   8.9   10.81   ~ 340 0
10 NGC 3115 GiG 10 05 13.978 -07 43 06.89   11   9.37   ~ 944 2
11 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 735 1
12 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1397 0
13 NGC 3599 GiP 11 15 26.9498387938 +18 06 37.431040640   13.0       ~ 183 0
14 NGC 3605 GiG 11 16 46.622 +18 01 01.71   12.7       ~ 245 0
15 NGC 4168 Sy1 12 12 17.234 +13 12 19.27 12.58 12.11 11.18     ~ 358 2
16 NGC 4239 GiG 12 17 14.9407244878 +16 31 52.734917127   13.5       ~ 115 0
17 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 806 0
18 NGC 4387 GiG 12 25 41.6768872639 +12 48 37.809497625 13.42 13.01 12.12   10.87 ~ 374 1
19 NGC 4434 GiG 12 27 36.680 +08 09 15.52   13.2       ~ 237 0
20 NGC 4458 GiP 12 28 57.532 +13 14 30.90 13.27 12.93 12.07     ~ 392 2
21 NGC 4464 GiG 12 29 21.313 +08 09 23.63   13.5       ~ 219 0
22 NGC 4478 GiP 12 30 17.439 +12 19 42.88 12.82 12.36 11.45   10.17 ~ 474 1
23 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6384 3
24 NGC 4551 GiP 12 35 37.980 +12 15 50.44 13.49 12.97 12.02     ~ 337 1
25 NGC 4564 GiG 12 36 26.994 +11 26 21.55 12.51 12.05 11.12     ~ 569 1
26 M 59 GiG 12 42 02.322 +11 38 48.95   11.0       ~ 667 0
27 NAME NGC 4636 Group GrG 12 42 49.5 +02 41 08           ~ 550 0
28 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1051 1
29 M 60 GiP 12 43 40.008 +11 33 09.40   10.3       ~ 1270 0
30 NGC 4697 GiG 12 48 35.8992791099 -05 48 02.497675635   10.97   9.83   ~ 814 0
31 NGC 4874 LIN 12 59 35.709 +27 57 33.80 13.01 13.7 11.40 12.122 11.386 ~ 733 3
32 NGC 4889 BiC 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 659 1
33 NGC 5813 LIN 15 01 11.265 +01 42 07.09 12.00 11.45 10.46 10.06   ~ 591 1
34 3C 338.0 QSO 16 28 38.2447110 +39 33 04.233634   12.78 11.78     ~ 715 5
35 NAME Local Group GrG ~ ~           ~ 7232 0

    Equat.    Gal    SGal    Ecl

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2021.04.16-11:27:36

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