J/ApJ/658/980 New velocities for 62 globular clusters in M104 (Bridges+, 2007)
Spectroscopy of globular clusters out to large radius in the Sombrero galaxy.
Bridges T.J., Rhode K.L., Zepf S.E., Freeman K.C.
<Astrophys. J., 658, 980-992 (2007)>
=2007ApJ...658..980B 2007ApJ...658..980B
ADC_Keywords: Clusters, globular ; Radial velocities ; Photometry
Keywords: galaxies: formation - galaxies: kinematics and dynamics -
galaxies: star clusters
Abstract:
We present new velocities for 62 globular clusters in M104 (NGC 4594,
the Sombrero Galaxy), 56 from 2dF on the AAT and 6 from Hydra on WIYN.
Combined with previous data, we have a total sample of 108 M104
globular cluster velocities, extending to 20' radius (∼60kpc), along
with BVR photometry for each of these. We use this wide-field data set
to study the globular cluster kinematics and dark matter content of
M104 out to 10' radius (30kpc).
Description:
To create a list of targets for this study, we began with a
preliminary list of GC candidates produced from BVR images of M104
taken with the Mosaic Imager on the Kitt Peak National Observatory
(KPNO) 4m Mayall Telescope. The final results from the 4m Mosaic
survey of M104's GC system are published in Rhode & Zepf
(2004AJ....127..302R 2004AJ....127..302R).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 90 108 Spectroscopically Confirmed M104 Globular Clusters
table3.dat 55 108 Foreground Stars from 2dF and WIYN/Hydra Spectroscopy
table5.dat 39 706 Enclosed luminosity, mass, and mass-to-light ratio
versus deprojected radius for M104
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- RZ ? Rhode & Zepf (2004AJ....127..302R 2004AJ....127..302R) ID
where available, [RZ2004] GCl NNNN in Simbad
6- 10 A5 --- OID Other identification (1)
12- 13 I2 h RAh Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- Sign of the Declination (J2000)
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 39 I4 km/s RV Radial velocity
41- 43 I3 km/s e_RV Error in RV
45- 50 F6.2 arcmin x Position along major axis
52- 57 F6.2 arcmin y Position along minor axis
59- 63 F5.2 arcmin r Galactocentric radius (r*r = x*x + y*y)
65- 70 F6.2 deg theta Azimuthal angle
72- 76 F5.2 mag Vmag The V band magnitude
78- 82 F5.3 mag B-V The (B-V) color index
84- 88 F5.3 mag V-R The (V-R) color index
90 I1 --- Ref [1/4] Source flag (2)
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Note (1): Other identifications, when applicable, as:
N-NN = from Bridges et al. (1997MNRAS.284..376B 1997MNRAS.284..376B), [BAZ97] N-NN
C-NNN = from Larsen et al. (2002AJ....124..828L 2002AJ....124..828L), [LFB2001] C-NNN
H2-NN = from Larsen et al. (2002AJ....124..828L 2002AJ....124..828L), [LFB2001] H2-NN
Note (2): Source flag as follows:
1 = 2dF
2 = WHT
3 = Keck
4 = WIYN
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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- 4 I4 --- RZ ? Rhode & Zepf (2004AJ....127..302R 2004AJ....127..302R) ID where
available, [RZ2004] Star NNNN in Simbad (1)
6- 7 I2 h RAh Hour of Right Ascension (J2000)
9- 10 I2 min RAm Minute of Right Ascension (J2000)
12- 16 F5.2 s RAs Second of Right Ascension (J2000)
18 A1 --- DE- Sign of the Declination (J2000)
19- 20 I2 deg DEd Degree of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 33 I4 km/s RV Radial velocity
35- 37 I3 km/s e_RV Error in RV
39- 43 F5.2 mag Vmag KPNO Harris V band magnitude
45- 49 F5.3 mag B-V KPNO Harris (B-V) color index
51- 55 F5.3 mag V-R KPNO Harris (V-R) color index
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Note (1): One object (RZ# 2458) was observed with WIYN/Hydra; all others
are from the 2dF data.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 F6.3 arcmin r Radius from galaxy center
8- 13 F6.3 solLum LV Enclosed luminosity
15- 20 F6.3 solLum e_LV Lower 1σ confidence limit on LV
22- 27 F6.3 solLum E_LV Upper 1σ confidence limit on LV
29- 33 F5.2 solMass/solLum (M/L)l Lower 1σ V band mass-to-light
ratio confidence limit
35- 39 F5.2 solMass/solLum (M/L)h Upper 1σ V band mass-to-light
ratio confidence limit
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 23-Jan-2009