J/MNRAS/396/1075 Globular cluster in nearby dwarf galaxies. II (Georgiev+, 2009)
Globular cluster systems in nearby dwarf galaxies. II. Nuclear star clusters and their relation to massive Galactic globular clusters. Georgiev I.Y., Hilker M., Puzia T.H., Goudfrooij P., Baumgardt H. <Mon. Not. R. Astron. Soc., 396, 1075-1085 (2009)> =2009MNRAS.396.1075G
ADC_Keywords: Galaxies, nearby ; Associations, stellar ; Morphology Keywords: galaxies: dwarf - galaxies: irregular - galaxies: nuclei - galaxies: star clusters Abstract: We compare nuclear globular clusters (nGCs) in dwarf galaxies and Galactic GCs with extended (hot) horizontal branches (EHB-GCs) in order to test the suggested external origin of the latter and the conditions at which GC self-enrichment can operate. Using luminosities and structural parameters of nGCs in low-mass (mainly late-type) dwarf galaxies from Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) imaging, we derive the present-day escape velocities (Vesc) of stellar ejecta to reach the cluster tidal radius and compare them with those of EHB-GCs. Description: Data reduction, photometry, completeness analysis, contamination and structural parameter measurements of all clusters are described in detail in Georgiev et al. (2008, Cat. J/AJ/135/1858 and 2009, Cat. J/MNRAS/392/879). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tables3.dat 84 175 Properties of nuclear clusters of late-type dwarf galaxies tables4.dat 82 140 Properties of Galactic globular clusters
See also: J/AJ/135/1858 : Old globular clusters in dwarf irr. galaxies (Georgiev+ 2008) J/MNRAS/392/879 : Globular clusters in nearby dwarf galaxies (Georgiev+, 2009) Byte-by-byte Description of file: tables3.dat
Bytes Format Units Label Explanations
1- 5 A5 --- GType Host galaxy type (dIrr, dE, dSph or Sm) 8- 18 A11 --- [GPH2009] Cluster name (Georgiev et al. 2009, Cat. J/MNRAS/392/879) 20- 24 F5.2 Mpc Dist Distance to the galaxy (1) 26- 30 F5.3 mag E(B-V) Foreground Galactic extinction E(B-V) from NED 32- 36 F5.3 mag (V-I)0 Cluster V-I color index (corrected for foreground extinction) 38- 43 F6.2 mag VMAG Cluster absolute V magnitude 45- 48 F4.2 [Msun] logM log10 of cluster mass 50- 53 F4.2 --- ell Cluster ellipticity 55- 59 F5.2 pc rh Cluster half-light radius 61- 64 F4.2 --- c concentration index, c=log(rt/rc) (ratio of tidal to core radius) 66- 71 F6.2 km/s Vesc Escape velocity to reach the tidal radius 73- 78 F6.1 pc rp Projected distance from the galaxy center 80- 84 F5.1 --- rp.n ? Projected distance normalized to galaxy effective radius reff (rp/reff) (2)
Note (1): Distance to the galaxy adopted from (Tully et al. 2006AJ....132..729T, Karachentsev et al. 2006AJ....131.1361K, and 2007, Cat. J/AJ/133/504) Note (2): where reff=sqrt(a*b), where a and b are the galaxy semi major and minor axes.
Byte-by-byte Description of file: tables4.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Cluster name 10 A1 --- --- [/] 11- 22 A12 --- OName Other name 24- 27 F4.2 mag E(B-V) Foreground Galactic extinction E(B-V) from Harris (1996, Cat. VII/195) 29- 33 F5.2 mag (V-I)0 ?=- Cluster V-I color index (corrected for foreground extinction) 35- 40 F6.2 mag VMAG Cluster absolute V magnitude 42- 45 F4.2 [Msun] logM log10 of cluster mass 47- 51 F5.2 pc rh Cluster half-light radius 53- 56 F4.2 --- c Concentration index, c=log(rt/rc) (ratio of tidal to core radius) 58- 62 F5.2 km/s Vesc Escape velocity to reach the tidal radius 64- 68 F5.2 [-] [Fe/H] Matallicity 70- 74 F5.2 --- HBR ?=- HB ratio HBR=(B-R)/(B+V+R) from Harris (1996, Cat. VII/195) 76- 79 A4 --- HBt ?=- HB morphology (1) 81- 82 A2 --- Class Classification (2)
Note (1): sEHB and mEHB, B and R for strong and moderately extended (from Lee et al. 2007ApJ...661L..49L), blue and red HBs, if HBR>0 or HBR<0, respectively. Note (2): Classification of the cluster according to which Galactic GC sub-population it belongs as follows: BD = bulge/disk OH = old halo YH = young halo SG = Saggitarius UN = unknown classification The cluster Class was adopted from Mackey & van den Bergh (2005MNRAS.360..631M), which follows the original Zinn (1993, ASP Conf. Ser. Vol. 48,, p. 38) classification.
History: From electronic version of the journal References: Georgiev et al., Paper I 2009MNRAS.392..879G, Cat J/MNRAS/392/879 Georgiev et al., Paper III 2010MNRAS.406.1967G
(End) Patricia Vannier [CDS] 14-Feb-2011
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