2005A&A...433...43D


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.17CEST06:42:57

2005A&A...433...43D - Astronomy and Astrophysics, volume 433, 43-56 (2005/4-1)

A wide-field photometric study of the globular cluster system of NGC 4636.

DIRSCH B., SCHUBERTH Y. and RICHTLER T.

Abstract (from CDS):

Previous smaller-scale studies of the globular cluster system of NGC 4636, an elliptical galaxy in the southern part of the Virgo cluster, have revealed an unusually rich globular cluster system. We re-investigate the cluster system of NGC 4636 with wide-field Washington photometry. The globular cluster luminosity function can be followed roughly 1mag beyond the turn-over magnitude found at V=23.31±0.13 for the blue cluster sub-population. This corresponds to a distance modulus of (m-M)=31.24±0.17, 0.4mag larger than the distance determined from surface brightness fluctuations. The high specific frequency is confirmed, yet the exact value remains uncertain because of the uncertain distance: it varies between 5.6±1.2 and 8.9±1.2. The globular cluster system has a clearly bimodal color distribution. The color peak positions show no radial dependence and are in good agreement with the values found for other galaxies studied in the same filter system. However, a luminosity dependence is found: brighter clusters with an ``intermediate'' color exist. The clusters exhibit a shallow radial distribution within 7', represented by a power-law with an exponent of -1.4. Within the same radial interval, the galaxy light has a distinctly steeper profile. Because of the difference in the cluster and light distribution the specific frequency increases considerably with radius. At 7' and 9' the density profiles of the red and blue clusters, respectively, change strongly: the power-law indices decrease to around -5 and become similar to the galaxy profile. This steep profile indicates that we reach the outer rim of the cluster system at approximately 11'. This interpretation is supported by the fact that in particular the density distribution of the blue cluster population can be well fit by the projection of a truncated power-law model with a core. This feature is seen for the first time in a globular cluster system. While the radial distribution of the cluster and field populations are rather different, this is not true for the ellipticity of the system: the elongation as well as the position angle of the cluster system agree well with the galaxy light. We compare the radial distribution of globular clusters with the light profiles for a sample of elliptical galaxies. The difference observed in NGC 4636 is typical of an elliptical galaxy of this luminosity. The intrinsic specific frequency of the blue population is considerably larger than that of the red one.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 4636 - galaxies: star clusters - galaxies: stellar content - galaxies: structure

VizieR on-line data: <Available at CDS (J/A+A/433/43): tablea1.dat tablea2.dat tablea3.dat tablea4.dat tablea5.dat tablea6.dat>

Nomenclature: Table a1: [DSR2005] JHHMMSS.ss+DDMMSS.s N=16277.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 46

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Number of rows : 46

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 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11343 1
2 NGC 524 GiP 01 24 47.707 +09 32 19.65   11.5       ~ 432 1
3 NGC 708 BiC 01 52 46.482 +36 09 06.53 14.85 14.27 13.29 12.67 12.09 ~ 216 3
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 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1183 2
7 RXC J0252.8-0116 ClG 02 52 49.4 -01 16 27           ~ 100 0
8 NGC 1132 GiG 02 52 51.82 -01 16 29.0   13.9   12.16   ~ 150 0
9 NGC 1316 GiP 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1239 1
10 NGC 1336 GiG 03 26 32.199 -35 42 48.86   13.12   11.95   ~ 111 0
11 NGC 1351 GiG 03 30 34.983 -34 51 14.22   12.30   10.85   ~ 161 0
12 NGC 1373 GiP 03 34 59.208 -35 10 16.25 14.44 14.03 13.26     ~ 108 1
13 NGC 1374 GiP 03 35 16.598 -35 13 34.50 12.46 11.97 11.08 10.59   ~ 263 1
14 NGC 1375 GiG 03 35 16.8019706983 -35 15 56.379169010 13.50 13.02 12.40 11.74   ~ 144 1
15 NGC 1379 GiP 03 36 03.940 -35 26 28.23 12.17 12.04 10.91 10.60   ~ 246 1
16 NGC 1380 GiP 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 386 1
17 NGC 1381 GiP 03 36 31.6595958424 -35 17 42.745665386 12.90 12.47 11.50 11.02   ~ 220 1
18 ESO 358-33 GiG 03 36 47.5025610434 -34 44 22.780563798 13.63 13.36 12.41 12.00   ~ 116 1
19 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1483 1
20 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1616 0
21 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 684 1
22 NGC 1419 GiG 03 40 42.120 -37 30 39.09   13.56   12.07   ~ 116 0
23 NGC 1427 GiG 03 42 19.4447168502 -35 23 33.193682690   11.89   10.44   ~ 256 0
24 NGC 1700 GiG 04 56 56.347 -04 51 56.64   12   11.14   ~ 333 1
25 NGC 3115 GiG 10 05 13.978 -07 43 06.89   11   9.37   ~ 948 2
26 NGC 3258 BiC 10 28 53.588 -35 36 19.98   12.50 11.72 10.86   ~ 172 0
27 NGC 3268 BiC 10 30 00.655 -35 19 31.83   12.57 11.77 10.68   ~ 143 0
28 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 785 1
29 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 276 2
30 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1398 0
31 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1143 0
32 NGC 4278 LIN 12 20 06.8253868 +29 16 50.713486 11.54 11.09 10.16     ~ 899 2
33 NGC 4339 GiP 12 23 34.9404906978 +06 04 54.466056554   13.1       ~ 225 0
34 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 806 0
35 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1024 1
36 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6053 0
37 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1991 2
38 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6426 3
39 M 104 LIN 12 39 59.43185 -11 37 22.9954 9.51 9.55 8.00 8.05   ~ 1301 3
40 NGC 4600 GiG 12 40 22.9625843491 +03 07 03.941143248   13.7       ~ 78 0
41 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1053 1
42 NGC 4697 GiG 12 48 35.8992791099 -05 48 02.497675635   10.97   9.83   ~ 814 0
43 NGC 5018 GiP 13 13 01.000 -19 31 05.87   11.71   10.31   ~ 288 1
44 NGC 5193 BiC 13 31 53.5250724472 -33 14 03.581095928   12.69 11.92 11.31   ~ 98 0
45 NGC 7014 BiC 21 07 52.185 -47 10 44.53   12.93 12.25 11.56   ~ 96 1
46 IC 5193 GiG 22 15 43.5147647848 +37 14 34.192282775   16       ~ 12 0

    Equat.    Gal    SGal    Ecl

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2021.06.17-06:42:57

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