J/ApJ/591/850 Radial velocities of M49 globular clusters (Cote+, 2003)
Dynamics of the globular cluster system associated with M49 (NGC 4472):
cluster orbital properties and the distribution of dark matter.
Cote P., McLaughlin D.E., Cohen J.G., Blakeslee J.P.
<Astrophys. J. 591, 850 (2003)>
=2003ApJ...591..850C 2003ApJ...591..850C
ADC_Keywords: Clusters, globular ; Radial velocities
Keywords: galaxies: clusters: individual (Virgo) - galaxies: halos -
galaxies: individual (M49, NGC 4472) -
galaxies: kinematics and dynamics - galaxies: star clusters -
globular clusters: general
Abstract:
Using the Low Resolution Imaging Spectrometer on the Keck I and II
telescopes, we have measured radial velocities for 196 globular
clusters (GCs) around M49 (NGC 4472), the brightest member of the
Virgo Cluster. Combined with published data, they bring the total
number of GCs with measured radial velocities in this galaxy to 263.
In terms of sample size, spatial coverage, velocity precision, and the
availability of metallicity estimates from Washington photometry, this
radial velocity database resembles that presented recently for M87
(NGC 4486), Virgo's cD galaxy and its second-ranked member. We extract
the projected kinematics of the full sample of GCs and of separate
subsamples of 158 metal-poor and 105 metal-rich GCs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 87 345 Radial velocities for confirmed and candidate
M49 globular clusters
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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 A4 --- Class Object classification (1)
7- 10 I4 --- [GLK96] Object identification (2)
12- 13 I2 h RAh Hour of Right Ascension (J2000) (2)
15- 16 I2 min RAm Minute of Right Ascension (J2000) (2)
18- 22 F5.2 s RAs Second of Right Ascension (J2000) (2)
23 A1 --- DE- sign of Declination (J2000) (2)
24 I1 deg DEd Degree of Declination (J2000) (2)
26- 27 I2 arcmin DEm Arcminute of Declination (J2000) (2)
29- 32 F4.1 arcsec DEs Arcsecond of Declination (J2000) (2)
34- 38 F5.1 arcsec Rad Distance from the center of M49 (3)
40- 44 F5.1 deg PA Position angle in degrees East of North (3)
46- 50 F5.2 mag T1mag The T1 band magnitude
52- 55 F4.2 mag C-T1 The (C-T1) color index
57- 61 F5.2 [---] [Fe/H] ? Metallicity (4)
63- 66 F4.2 [---] e_[Fe/H] ? Uncertainty in [Fe/H]
68- 72 I5 km/s RV Radial velocity measurement
74- 76 I3 km/s e_RV Uncertainty in RVel
78 A1 --- r_RV Source for RV (5)
80- 83 I4 km/s RVwm Weighted mean radial velocity
85- 87 I3 km/s e_RVwm Uncertainty in RVwm
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Note (1): Classes as follows:
GC = Globular clusters
FSBG = Foreground Stars and Background Galaxies
DO = Discrepant Objects
Discrepant Objects are omitted from final GC sample.
Note (2): From Geisler et al. (1996AJ....111..480G 1996AJ....111..480G).
Note (3): From Geisler et al. (1996AJ....111..480G 1996AJ....111..480G). In calculating
Rad and PA, we take the center of M49 to be RA=12:29:47.5,
DE=+08:00:10.5, J2000, following Sharples et al. (1998AJ....115.2337S 1998AJ....115.2337S).
Note (4): Based on the color-metallicity relation of Geisler & Forte
(1990ApJ...350L...5G 1990ApJ...350L...5G).
Note (5): Sources for radial velocity as follows:
M = Mould et al. (1990AJ.....99.1823M 1990AJ.....99.1823M)
S = Sharples et al. (1998AJ....115.2337S 1998AJ....115.2337S)
Z = Zepf et al (2000AJ....120.2928Z 2000AJ....120.2928Z)
1-4 = as given in Table 1 (Observing Log):
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Run Date Grating Lambdac Lambdac/DLambdac
(Å)
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1 1998 Apr 16-17 600/5000 5200 870
2 1999 Mar 24 600/7500 8550 1425
3 1999 Apr 6 600/7500 8550 1425
4 2000 Apr 30 600/5000 4860 870
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 26-Sep-2003