J/AJ/128/723 Washington Photometry in NGC 5128. II (Harris+, 2004)
Wide-field Washington photometry of the NGC 5128 globular cluster system.
II. Large-scale properties of the system.
Harris G.L.H., Harris W.E., Geisler D.
<Astron. J., 128, 723-735 (2004)>
=2004AJ....128..723H 2004AJ....128..723H
ADC_Keywords: Clusters, globular ; Photometry, CMT1T2V
Keywords: galaxies: individual (NGC 5128) - galaxies: stellar content -
globular clusters: general
Abstract:
Building on the CMT1 photometric database presented in Paper I (Cat.
J/AJ/128/712), in this paper we derive the large-scale properties of
the globular cluster system (GCS) in NGC 5128, the nearest giant
elliptical and the dominant galaxy in the Centaurus group. Using the
metallicity-sensitive C-T1 color index, we discuss the metallicity
distribution function (MDF) for a subsample of 211 previously
identified clusters, all on a homogeneous photometric system. We find
the MDF to be strongly bimodal, with metallicity peaks at [Fe/H]=-1.55
and -0.55 and with nearly equal numbers of clusters in each of the
metal-poor and metal-rich modes.
Finally, we present a list of 327 new cluster candidates not
identified in any previous surveys; most of these are in the less well
studied bulge region of the galaxy and along the minor axis.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 63 210 Washington Photometry for Individual Globular
Clusters
table4.dat 46 327 List of New Cluster Candidates
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See also:
J/AJ/128/712 : Washington Photometry in NGC 5128 (Harris+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Cluster name (1)
10- 18 F9.6 h RAhr Hour of right ascension (J2000) (2)
20- 28 F9.5 deg DEdeg Decimal degree of declination (J2000) (2)
30- 35 F6.3 mag T1mag Washington T1 band magnitude
37- 42 F6.3 mag M-T1 Washington (M-T1) color
44- 49 F6.3 mag C-M ? Washington (C-M) color
51- 56 F6.3 mag C-T1 ? Washington (C-T1) color
58- 62 F5.2 mag Vmag The V-band magnitude
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Note (1): The numbers refer to the following cluster identifications:
CNN = Hesser et al. (1984ApJ...276..491H 1984ApJ...276..491H) [VHH81] NN in SIMBAD,
GNNN = Sharples (1988IAUS..126..545S 1988IAUS..126..545S) [HGH92] GNNN in SIMBAD,
f1.GC-NN and f2.GC-NN = Rejkuba (2001, Cat. J/A+A/369/812)
[R2001b] f1.GC-NN and [R2001b] f2.GC-NN in SIMBAD
PFFNNN = Peng et al. (2004, Cat. J/ApJS/150/367)
[PFF 2004] gc NNN in SIMBAD.
Note (2): The coordinates listed are all from our BTC data (see Paper I,
Cat. J/AJ/128/712) for an extensive comparison of our BTC
coordinates with those measured in the previous studies).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [HHG2004] Object identification number
6- 15 F10.6 deg RAdeg Right ascension in decimal degrees (J2000)
17- 25 F9.5 deg DEdeg Declination in decimal degrees (J2000)
27- 32 F6.3 mag T1mag ?=99.999 Washington T1 band magnitude
34- 39 F6.3 mag M-T1 The (M-T1) color
41- 46 F6.3 mag C-T1 The (C-T1) color
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History:
From electronic version of the journal
References:
Harris et al., Paper I, 2004AJ....128..712H 2004AJ....128..712H, Cat. J/AJ/128/712
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 24-Jan-2005