J/ApJ/709/377 The globular cluster system of NGC 4636 (Park+, 2010)
The globular cluster system of the Virgo giant elliptical galaxy NGC 4636.
I. Subaru/Faint Object Camera and Spectrograph spectroscopy and database.
Park H.S., Lee M.G., Hwang H.S., Arimoto N., Tamura N., Onodera M.
<Astrophys. J., 709, 377-385 (2010)>
=2010ApJ...709..377P 2010ApJ...709..377P
ADC_Keywords: Galaxies, photometry ; Clusters, globular ; Radial velocities ;
Cross identifications
Keywords: galaxies: clusters: general - galaxies: individual (NGC 4636) -
galaxies: kinematics and dynamics - galaxies: star clusters: general
Abstract:
We present a spectroscopic study of the globular clusters (GCs) in the
giant elliptical galaxy NGC 4636 in the Virgo Cluster. We selected
target GC candidates using the Washington photometry derived from the
deep CCD images taken at the KPNO 4m Telescope. Then we obtained the
spectra of 164 target objects in the field of NGC 4636 using the
Multi-Object Spectroscopy mode of Faint Object Camera and Spectrograph
on the Subaru 8.2m Telescope. We have measured the velocities for 122
objects: 105 GCs in NGC 4636, the nucleus of NGC 4636, 11 foreground
stars, two background galaxies, and three probable intracluster GCs in
the Virgo Cluster. The GCs in NGC 4636 are located in the projected
galactocentric radius within 10' (corresponding to 43kpc). The
measured velocities for the GCs range from ∼300km/s to ∼1600km/s, with
a mean value of 932+25-22km/s, which is in good agreement with the
velocity for the nucleus of NGC 4636, 928±45km/s.
Description:
Spectroscopic data of 168 targets were obtained using the Multi-Object
Spectrography (MOS) mode of Faint Object Camera and Spectrograph
(FOCAS) at the Subaru 8.2m Telescope on 2002 April 20 and 21.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 106 122 Radial velocities of the objects in the field
of NGC 4636
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See also:
J/ApJ/695/1094 : Chandra observations of NGC 4636 (Posson-Brown+, 2009)
J/A+A/459/391 : Dynamics of NGC 4636 globular cluster system (Schuberth+,
2006)
J/A+A/433/43 : C-T1 phot. of NGC 4636 globular cluster system (Dirsch+, 2005)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Type Object type (GCs, Stars, Galaxies, Probable) (1)
10- 14 A5 --- ID Object identification number
16- 17 I2 h RAh Hour of Right ascension (J2000)
19- 20 I2 min RAm Minute of Right ascension (J2000)
22- 26 F5.2 s RAs Second of Right ascension (J2000)
28 A1 --- DE- Sign of Declination (J2000)
29 I1 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000)
39- 43 F5.1 arcsec Rad Distance from center of NGC 4636
45- 49 F5.1 deg PA Position angle of object
51- 55 F5.2 mag T1mag ? KPNO Washington T1-band magnitude
57- 60 F4.2 mag e_T1mag ? The error in T1mag
62- 65 F4.2 mag C-T1 ? The Washington (C-T1) color index
67- 70 F4.2 mag e_C-T1 ? The error in C-T1
72- 76 I5 km/s RV Radial velocity measured in this study
78- 80 I3 km/s e_RV The error in RV
82- 85 I4 km/s RVS06 ? Schuberth et al. 2006, Cat. J/A+A/459/391,
radial velocity
87- 88 I2 km/s e_RVS06 ? The error in RVS06
90- 96 A7 --- IDS06 ID in Schuberth et al. 2006, Cat. J/A+A/459/391
(<[SRD2006] F.F NNN> for Simbad)
98-102 I5 km/s RVm Adopted Mean Radial Velocity
104-106 I3 km/s e_RVm The error in RVm
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Note (1):
Probable = Probable intracluster globular clusters in the Virgo cluster.
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History:
From electronic version of the journal
References:
Lee et al. Paper II. 2010ApJ...709.1083L 2010ApJ...709.1083L
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 01-Mar-2012