2007AJ....134..912N

Query : 2007AJ....134..912N

2007AJ....134..912N - Astron. J., 134, 912-925 (2007/September-0)

Surface brightness profiles for a sample of LMC, SMC, and Fornax galaxy globular clusters.

NOYOLA E. and GEBHARDT K.

Abstract (from CDS):

We use Hubble Space Telescope archival images to measure central surface brightness profiles of globular clusters around satellite galaxies of the Milky Way. We report results for 21 clusters around the LMC, five around the SMC, and four around the Fornax dwarf galaxy. The profiles were obtained using a recently developed technique based on measuring integrated light, which is tested on an extensive simulated data set. Our results show that for 70% of the sample, the central photometric points of our profiles are brighter than previous measurements using star counts with deviations as large as 2 mag/arcsec2. About 40% of the objects have central profiles deviating from a flat central core, with central logarithmic slopes continuously distributed between -0.2 and -1.2. These results are compared with those found for a sample of Galactic clusters using the same method. We confirm the known correlation in which younger clusters tend to have smaller core radii, and we find that they also have brighter central surface brightness values. This seems to indicate that globular clusters might be born relatively concentrated, and that a profile with an extended flat core might not be the ideal choice for initial profiles in theoretical models.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Globular Clusters: General - Stellar Dynamics

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 - 2026 		#notes
1 ESO 28-19 Cl* 00 24 45.98 -72 47 37.9   11.6 12.05     ~ 152 0
2 NGC 121 GlC 00 26 49.0 -71 32 10   11.2 11.24     ~ 330 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 NGC 330 Cl* 00 56 18.55 -72 27 45.1 9.37 9.76 9.55   8.89 ~ 445 0
5 NGC 411 Cl* 01 07 55.64 -71 46 03.1 13.05 12.63 12.10   11.11 ~ 107 0
6 NGC 416 Cl* 01 07 59.03 -72 21 20.5 12.73 12.55 11.76   10.71 ~ 156 1
7 NAME Fornax H2 GlC 02 38 44.24 -34 48 30.5   14.5       ~ 93 0
8 NAME Fornax H3 GlC 02 39 48.16 -34 15 28.6   13.59       ~ 131 0
9 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
10 NAME Fornax H4 GlC 02 40 07.697 -34 32 10.59   15.18 13.91 14.08   ~ 112 0
11 NAME Fornax H5 GlC 02 42 21.111 -34 06 05.80   14.5       ~ 101 0
12 NGC 1466 GlC 03 44 32.71 -71 40 18.0   11.6 11.59     ~ 166 0
13 NGC 1651 GlC 04 37 32.530 -70 35 08.71   12.99 12.28     ~ 125 0
14 NGC 1711 Cl* 04 50 37.320 -69 59 01.72   11.22 11.10     ~ 115 0
15 NGC 1754 Cl* 04 54 18.080 -70 26 32.58   12.32 11.57     ~ 96 0
16 NGC 1786 Cl* 04 59 07.470 -67 44 45.44   10.1       ~ 152 0
17 HD 268850 AB* 05 02 21.4730341272 -66 06 38.294439372   11.83 11.55 12.43   ~ 89 0
18 NGC 1805 GlC 05 02 21.690 -66 06 39.43           ~ 115 0
19 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 279 0
20 NGC 1835 Cl* 05 05 09.210 -69 24 20.96   11.314 10.596     ~ 173 0
21 NGC 1866 GlC 05 13 38.920 -65 27 52.75           ~ 437 0
22 NGC 1868 GlC 05 14 36.60 -63 57 25.7           ~ 123 0
23 NGC 1898 As* 05 16 45.380 -69 39 16.76   12.62 11.86     ~ 104 0
24 NGC 1916 Cl* 05 18 37.87 -69 24 22.9   11.16 10.38     ~ 94 0
25 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
26 NGC 1984 Cl* 05 27 40 -69 08.1   10.00 9.99     ~ 78 0
27 NGC 2005 Cl* 05 30 08.500 -69 45 14.42   12.30 11.57     ~ 103 0
28 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 281 0
29 NGC 2019 Cl* 05 31 56.48 -70 09 32.5   10.9 10.86     ~ 124 0
30 NGC 2031 GlC 05 33 41.440 -70 59 14.54   11.09 10.83     ~ 75 0
31 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
32 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
33 NGC 2100 Cl* 05 42 07.200 -69 12 26.99           ~ 195 0
34 NGC 2214 OpC 06 12 57 -68 15.6   11.04 10.93     ~ 119 0
35 NGC 2257 Cl* 06 30 12.62 -64 19 40.0   13.24 12.62     ~ 228 0

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