J/A+A/544/A115 Velocities of NGC 4636 globular clusters (Schuberth+, 2012)
Dynamics of the NGC 4636 globular cluster system.
II. Improved constraints from a large sample of globular cluster velocities.
Schuberth Y., Richtler T., Hilker M., Salinas R., Dirsch B., Larsen S.S.
<Astron. Astrophys., 544, A115 (2012)>
=2012A&A...544A.115S 2012A&A...544A.115S
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Radial velocities
Keywords: galaxies: elliptical and lenticular, cD -
galaxies: kinematics and dynamics - galaxies: individual: NGC 4636 -
galaxies: star clusters: general
Abstract:
We present new radial velocities for 289 globular clusters around NGC
4636, the southernmost giant elliptical galaxy of the Virgo cluster.
The data were obtained with FORS2/MXU at the Very Large Telescope.
Together with data analysed in an earlier study, we now have a sample
of 460 globular cluster velocities out to a radius of 12-arcmin
(60kpc) available - one of the largest of its kind. This new data set
also provides a much more complete angular coverage. Moreover, we
present new kinematical data of the inner stellar population of NGC
4636. We perform an updated Jeans analysis, using both stellar and GC
data, to better constrain the dark halo properties.
Description:
The observations were carried out in service mode at the European
Southern Observatory (ESO) Very Large Telescope (VLT) facility on
Cerro Paranal, Chile. We used the FORS 2 (FOcal Reducer/low dispersion
Spectrograph) equipped with the Mask EXchance Unit (MXU). The
programme ID is 075.B-0762(B).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 102 567 Catalogue of globular cluster velocities
tabled1.dat 102 326 Catalogue of foreground star velocities
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See also:
J/A+A/433/43 : C-T1 phot. of NGC 4636 globular cluster system (Dirsch+, 2005)
Byte-by-byte Description of file: tablec1.dat tabled1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- ID Spectrum identifier (mask:slit) (1)
9- 10 I2 h RAh Right ascension (J2000) (2)
12- 13 I2 min RAm Right ascension (J2000) (2)
15- 19 F5.2 s RAs Right ascension (J2000) (2)
21 A1 --- DE- Declination sign (J2000) (2)
22- 23 I2 deg DEd Declination (J2000) (2)
25- 26 I2 arcmin DEm Declination (J2000) (2)
28- 31 F4.1 arcsec DEs Declination (J2000) (2)
33- 37 F5.2 arcmin Dist Projected distance from the centre of NGC 4636
39- 44 F6.1 deg PA [-180/180] Position angle
(measured North over East)
46- 50 F5.2 mag Rmag ?=- R magnitude from Dirsch et al. (2005,
Cat. J/A+A/433/43)
52- 56 F5.2 mag C-R ?=- C-R colour index from Dirsch et al. (2005,
Cat. J/A+A/433/43)
58- 61 I4 km/s HRV Heliocentric velocity measured for a given
spectrum
63- 65 I3 km/s e_HRV rms uncertainty on HRV
67- 70 I4 km/s Vf Final velocity (from Paper I)
72- 74 I3 km/s e_Vf rms uncertainty on Vf
76- 84 A9 --- Sample Subsample name (3)
86-100 A15 --- CI Cross-Identification(s) within this list (4)
102 I1 --- First [0/1] 1 for the first appearance of an object
in this table, all subsequent entries for
the same object are labelled 0
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Note (1): Note that the new data have the prefix "f". For the purpose of
cross-referencing, the data from Paper I are also included in this table.
Note (2): for objects with Washington photometry, the coordinates are those
from Dirsch et al. 2005, Cat. J/A+A/433/43; for objects not in the
photometric catalogue, the values were estimated from the pre-images).
Note (3): Subsamples are defined as (R = projected distance in arcmin):
R2.5 = globular clusters with R≤2.5arcmin
Blue = all 209 blue globular clusters with R≥2.5arcmin
BlueFinal = 156 blue globulars with R≥2.5arcmin, ΔV≤65km/s,
6 outliers removed;
Red = all 162 red globulars with R≥2.5arcmin
RedFinal = 160 red globulars with R≥2.5arcmin, 2 outliers removed
Note (4): Objects labelled N.N:NN are from Schuberth et al., 2006,
Cat. J/A+A/459/391; <[SRD2006] F.F NNN> in Simbad.
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History:
From electronic version of the journal
References:
Richtler et al., Paper I 2011A&A...531A.119R 2011A&A...531A.119R
(End) Patricia Vannier [CDS] 18-Oct-2012