J/AJ/131/814 VCC 1087 globular cluster system (Beasley+, 2006)
The globular cluster system of the Virgo dwarf elliptical galaxy VCC 1087.
Beasley M.A., Strader J., Brodie J.P., Cenarro A.J., Geha M.
<Astron. J., 131, 814-827 (2006)>
=2006AJ....131..814B 2006AJ....131..814B
ADC_Keywords: Clusters, globular ; Radial velocities ; Spectroscopy
Keywords: galaxies: dwarf - galaxies: individual (VCC 1087) -
galaxies: kinematics and dynamics - globular clusters: general
Abstract:
We present an analysis of the globular cluster (GC) system of the
nucleated dwarf elliptical galaxy VCC 1087 in the Virgo Cluster based
on Keck LRIS spectroscopy and archival Hubble Space Telescope Advanced
Camera for Surveys imaging. We estimate that VCC 1087 hosts a total
population of 77±19 GCs, which corresponds to a relatively high
V-band specific frequency of 5.8±1.4. The g475-z850 color
distribution of the GCs shows a blue (metal-poor) peak with a tail of
redder (metal-rich) clusters similar in color to those seen in
luminous elliptical galaxies.
Description:
Photometry of VCC 1087 and its GC system was derived from Sloan-type
g-band (F475W) and z-band (F850LP) wide-field images taken with the
Advanced Camera for Surveys (ACS) as part of the ACS Virgo Cluster
Survey (Cote et al. 2004, Cat. J/ApJS/153/223). Optical spectra were
obtained for 12 GC candidates identified from the g475 and z850
HST ACS images during the nights of 2004 April 24-25, using the Low
Resolution Imaging Spectrograph (LRIS) on the Keck I telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 13 Basic data for VCC 1087 globular clusters
table3.dat 227 13 Lick/IDS indices and uncertainties for VCC 1087
globular clusters
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See also:
J/ApJS/153/223 : ACS Virgo Cluster Survey. I. (Cote+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [BSB2006] Source name
9- 17 F9.5 deg RAdeg Right Ascension (J2000.0)
19- 26 F8.5 deg DEdeg Declination (J2000.0)
28- 33 F6.3 mag g475 g475 magnitude in the AB system (1)
35- 39 F5.3 mag e_g475 Error in g475mag
41- 46 F6.3 mag z850 z850 magnitude in the AB system (1)
48- 52 F5.3 mag e_z850 Error in z850mag
54- 58 F5.3 mag g-z g475-z850 color index in the AB system
60- 64 F5.3 mag e_g-z Error in g475-z850
66- 68 I3 km/s RV Radial velocity
70- 71 I2 km/s e_RV Error in RV
72 A1 --- f_RV [a] Velocity from the integrated light of the
nucleus+stellar envelope
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Note (1): We follow the convention of Cote et al. (2004, Cat. J/ApJS/153/223)
and refer to the ACS F475W and F850LP filters as g475 and z850,
respectively.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [BSB2006] Source name
8- 12 F5.2 0.1nm HdA Lick/IDS HδA index (1)
14- 17 F4.2 0.1nm e_HdA Uncertainty in HdF (1)
19- 22 F4.2 0.1nm HdF Lick/IDS HδF index (1)
24- 27 F4.2 0.1nm e_HdF Uncertainty in HdF (1)
29- 34 F6.3 mag CN1 Lick/IDS CN1 index
36- 40 F5.3 mag e_CN1 Uncertainty in CN1
42- 47 F6.3 mag CN2 Lick/IDS CN2 index
49- 53 F5.3 mag e_CN2 Uncertainty in CN2
55- 59 F5.2 0.1nm Ca4227 Lick/IDS Ca4227 index (1)
61- 64 F4.2 0.1nm e_Ca4227 Uncertainty in Ca4227 (1)
66- 70 F5.2 0.1nm G4300 Lick/IDS G4300 index (1)
72- 75 F4.2 0.1nm e_G4300 Uncertainty in G4300 (1)
77- 81 F5.2 0.1nm HgA Lick/IDS HγA index (1)
83- 86 F4.2 0.1nm e_HgA Uncertainty in HgF (1)
88- 92 F5.2 0.1nm HgF Lick/IDS HγF index (1)
94- 97 F4.2 0.1nm e_HgF Uncertainty in HgF (1)
99-103 F5.2 0.1nm Fe4384 Lick/IDS Fe4384 index (1)
105-108 F4.2 0.1nm e_Fe4384 Uncertainty in Fe4384 (1)
110-114 F5.2 0.1nm Ca4455 Lick/IDS Ca4455 index (1)
116-119 F4.2 0.1nm e_Ca4455 Uncertainty in Ca4455 (1)
121-125 F5.2 0.1nm Fe4531 Lick/IDS Fe4531 index (1)
127-130 F4.2 0.1nm e_Fe4531 Uncertainty in Fe4531 (1)
132-136 F5.2 0.1nm C2-4668 Lick/IDS C24668 index (1)
138-141 F4.2 0.1nm e_C2-4668 Uncertainty in C2-4668 (1)
143-146 F4.2 0.1nm Hb Lick/IDS Hβ index (1)
148-151 F4.2 0.1nm e_Hb Uncertainty in Hb (1)
153-156 F4.2 0.1nm Fe5015 Lick/IDS Fe5015 index (1)
158-161 F4.2 0.1nm e_Fe5015 Uncertainty in Fe5015 (1)
163-167 F5.3 mag Mg1 Lick/IDS Mg1 index
169-173 F5.3 mag e_Mg1 Uncertainty in Mg1
175-179 F5.3 mag Mg2 Lick/IDS Mg2 index
181-185 F5.3 mag e_Mg2 Uncertainty in Mg2
187-190 F4.2 0.1nm Mgb Lick/IDS Mgb index (1)
192-195 F4.2 0.1nm e_Mgb Uncertainty in Mgb (1)
197-201 F5.2 0.1nm Fe5270 Lick/IDS Fe5270 index (1)
203-206 F4.2 0.1nm e_Fe5270 Uncertainty in Fe5270 (1)
208-211 F4.2 0.1nm Fe5335 Lick/IDS Fe5335 index (1)
213-216 F4.2 0.1nm e_Fe5335 Uncertainty in Fe5335 (1)
218-222 F5.2 0.1nm Fe5406 Lick/IDS Fe5406 index (1)
224-227 F4.2 0.1nm e_Fe5406 Uncertainty in Fe5406 (1)
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Note (1): In units of Angstroms.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 12-Jan-2007