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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): Distance to the galaxy adopted from (Tully et al. 2006AJ....132..729T 2006AJ....132..729T,
Karachentsev et al. 2006AJ....131.1361K 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.
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Byte-by-byte Description of file: tables4.dat
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Bytes Format Units Label Explanations
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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)
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Note (1): sEHB and mEHB, B and R for strong and moderately extended (from
Lee et al. 2007ApJ...661L..49L 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 2005MNRAS.360..631M), which follows the original Zinn (1993,
ASP Conf. Ser. Vol. 48,, p. 38) classification.
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History:
From electronic version of the journal
References:
Georgiev et al., Paper I 2009MNRAS.392..879G 2009MNRAS.392..879G, Cat J/MNRAS/392/879
Georgiev et al., Paper III 2010MNRAS.406.1967G 2010MNRAS.406.1967G
(End) Patricia Vannier [CDS] 14-Feb-2011