2009A&A...497...65S


Query : 2009A&A...497...65S

2009A&A...497...65S - Astronomy and Astrophysics, volume 497, 65-80 (2009/4-1)

Globular cluster content and evolutionary history of NGC 147.

SHARINA M. and DAVOUST E.

Abstract (from CDS):

Globular clusters are representative of the oldest stellar populations. It is thus essential to have a complete census of these systems in dwarf galaxies, from which more massive galaxies are progressively formed in the hierarchical scenario. We present the results of spectroscopic observations of eight globular cluster candidates in NGC 147, a satellite dwarf elliptical galaxy of M 31. Our goal is to make a complete inventory of the globular cluster system of this galaxy, determine the properties of their stellar populations, and compare these properties with those of systems of globular clusters in other dwarf galaxies. The candidates were identified on Canada-France-Hawaii telescope photographic plates. Medium resolution spectra were obtained with the SCORPIO spectrograph at the prime focus of the 6 m telescope of the Russian Academy of Sciences. They were analyzed using predictions of stellar population synthesis models. We were able to confirm the nature of all eight candidates, three of which (GC5, GC7, and GC10) are indeed globular clusters, and to estimate evolutionary parameters for the two brightest ones and for Hodge II. The bright clusters GC5 and GC7 appear to have metallicities ([Z/H]~-1.5/-1.8) that are lower than the oldest stars in the galaxy. The fainter GC Hodge II has a metallicity [Z/H]=-1.1, similar to that of the oldest stars in the galaxy. The clusters GC5 and GC7 have low alpha-element abundance ratios. The mean age of the globular clusters in NGC 147 is 9±1Gyr. We also measured the radial velocities of Hodge II and IV, and derived a mass of NGC 147 in good agreement with the value from the literature. The frequency, Sn=6.4, and mass fraction, T=14 of globular clusters in NGC 147 appear to be higher than those for NGC 185 and 205. Our results indicate that the bright clusters GC5, GC7, and Hodge III formed in the main star-forming period ∼8-10Gyr ago, while the fainter clusters Hodge I and II formed together with the second generation of field stars.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: star clusters - galaxies: abundances

Nomenclature: Table 2: [SD2009] GCNN (Nos 5, 7, 10). [SD2009] GCCNN (Nos 6, 8, 9, 11, 12).

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 2665 PM* 00 30 45.4469338728 +57 03 53.628989292 8.66 8.51 7.72     G5IIIw 177 0
2 [SD2009] GC7 GlC 00 32 22.20 +48 31 27.5     17.4 16.6   ~ 6 0
3 [SD2009] GCC6 ? 00 32 22.90 +48 25 48.9     17.4 16.4   ~ 3 0
4 [SD2009] GC5 GlC 00 32 23.40 +48 25 44.7     18.8 18.0   ~ 2 0
5 [SD2009] GCC8 ? 00 32 35.30 +48 27 28.9     19.4     ~ 1 0
6 2MASS J00323902+4821358 NIR 00 32 39.0078648000 +48 21 35.638035624     18.5     ~ 1 0
7 [SD2009] GC10 GlC 00 32 48.60 +48 32 12.4     20.5 19.7   ~ 2 0
8 [SD2009] GCC11 ? 00 33 04.30 +48 26 46.1     19.9 19.4   ~ 1 0
9 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 687 1
10 FJJ NGC 147 I GlC 00 33 12.19 +48 30 32.4 19.1 18.5 17.7     ~ 6 0
11 FJJ NGC 147 III GlC 00 33 13.59 +48 28 48.6 17.7 17.6 17.0     ~ 6 0
12 FJJ NGC 147 II GlC 00 33 15.17 +48 27 23.2 17.5 17.1 16.5     ~ 5 0
13 2MASS J00334719+4823234 AG? 00 33 47.20 +48 23 23.5     19.8 20.7   ~ 2 0
14 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 800 1
15 FJJ NGC 185 VII GlC 00 39 18.40 +48 23 03.6   19.9 18.9     ~ 8 0
16 Bol 324 GlC 00 40 20.47 +41 40 49.3 18.640 17.850 18.446   17.633 ~ 41 1
17 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1310 1
18 Bol 328 GlC 00 40 24.5776022448 +41 40 22.510495740 19.230 18.750 17.861   16.918 ~ 45 0
19 Bol 331 GlC 00 40 26.15 +41 42 04.2   18.440 18.191   17.076 ~ 33 0
20 Bol 9 GlC 00 40 30.6999535344 +41 36 55.732742820 17.540 17.630 16.920 16.420 15.870 ~ 50 0
21 Bol 11 GlC 00 40 31.8784227360 +41 39 17.046655128 17.590 17.390 16.578 16.100 15.564 ~ 56 0
22 Bol 20 GlC 00 40 55.26 +41 41 25.3 15.980 15.743 14.910 14.367 13.650 ~ 61 0
23 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2155 2
24 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12678 1
25 NAME M31 Group GrG 00 47 28.6 +40 17 23           ~ 63 0
26 HD 7010 * 01 11 37.5781357656 +60 30 22.620236040   9.22 8.2     G8III? 31 0
27 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5847 1
28 HZ 4 WD* 03 55 21.9881513952 +09 47 18.135008592 13.917 14.592 14.506 14.58 14.642 DA3.4 203 0
29 * phi Aur * 05 27 38.8838207832 +34 28 33.166942464   6.467 5.059     K3IIIFe1 170 0
30 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6660 0
31 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 263 0
32 LAWD 52 WD* 13 38 50.4780906644 +70 17 07.640657534 11.807 12.54 12.60 13.01 12.979 DA2.4 217 0
33 LEDA 166179 G 13 48 46.4 -46 59 46           ~ 35 1
34 FJJ NGC 147 IV GlC ~ ~           ~ 3 0

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