J/AJ/127/2114 Globular clusters around NGC 1399 (Dirsch+, 2004)
The globular cluster system of NGC 1399. III. VLT spectroscopy and database.
Dirsch B., Richtler T., Geisler D., Gebhardt K., Hilker M., Alonso M.V.,
Forte J.C., Grebel E.K., Infante L., Larsen S., Minniti D., Rejkuba M.
<Astron. J., 127, 2114-2132 (2004)>
=2004AJ....127.2114D 2004AJ....127.2114D
ADC_Keywords: Galaxies, optical ; Clusters, globular ; Radial velocities
Keywords: dark matter - galaxies: elliptical and lenticular, cD -
galaxies: halos - galaxies: individual (NGC 1399) -
galaxies: kinematics and dynamics - galaxies: star clusters
Abstract:
Radial velocities of 468 globular clusters around NGC 1399, the
central galaxy in the Fornax cluster, have been obtained with FORS2
and the Mask Exchange Unit (MXU) at the ESO Very Large Telescope. This
is the largest sample of globular cluster velocities around any galaxy
obtained so far. The mean velocity uncertainty is 50km/s. This data
sample is accurate and large enough to be used in studies of the mass
distribution of NGC 1399 and the properties of its globular cluster
system. Here we describe the observations and the reduction procedure,
and we discuss the uncertainties of the resulting velocities. The
complete sample of cluster velocities that is used in a dynamical
study of NGC 1399 is tabulated. A subsample is compared with
previously published values.
Description:
Our candidate GCs have been selected on the basis of new wide-field
photometry in Washington C and Kron-Cousins R of the cluster system of
NGC 1399, obtained at the Cerro Tololo Inter-American Observatory
(CTIO) 4m MOSAIC system. For a description of the photometric
observations the reader is referred to Paper I (Dirsch et al.,
2003AJ....125.1908D 2003AJ....125.1908D).
The observations were performed during the period from 2000 November
30 to December 2 at the European Southern Observatory at Cerro Paranal
with the Very Large Telescope facility. The telescope was UT2 (Kueyen)
and the instrument the focal reducer FORS2, equipped with the MXU.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 99 502 Globular clusters for which velocities have been
determined with lines and/or cross-correlation
table4.dat 74 73 Stars in our sample for which velocities have
been determined with lines or cross-correlation
table5.dat 34 57 Compilation of clusters and stars for which
velocities have previously been published in
the literature
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See also:
J/AJ/105/1762 : Globular clusters around NGC 1399 (Ostrov+ 1993)
Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [DRG2004] Identifier (NN:NNN) (G1)
8 I1 h RAh Hour of right ascension (J2000)
10- 11 I2 min RAm Minute of right ascension (J2000)
13- 17 F5.2 s RAs Second of right ascension (J2000)
19 A1 --- DE- Sign of the declination (J2000)
20- 21 I2 deg DEd Degree of declination (J2000)
23- 24 I2 arcmin DEm Arcminute of declination (J2000)
26- 29 F4.1 arcsec DEs Arcsecond of declination (J2000)
31- 34 F4.2 mag C-Rc ? Washington C minus Kron-Cousins R-band colors
36- 39 F4.2 mag e_C-Rc ? Uncertainty in C-Rc (2)
41- 45 F5.2 mag Rcmag ? The Kron-Cousins R-band magnitude
47- 50 F4.2 mag e_Rcmag ? Uncertainty in Rcmag (2)
52- 55 I4 km/s CVel ? Correlation measurement velocity
57- 59 I3 km/s e_CVel ? Uncertainty in CVel
61- 64 I4 km/s LVel ? Direct line measurement velocity
66- 67 I2 km/s e_LVel ? Uncertainty in LVel
69-100 A32 --- Com Additional comments (3)
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Note (2): The uncertainties do not include the photometric calibration errors,
which are 0.03 in C-T1 and 0.02 in T1.
Note (3): An identifier for a different cluster indicates that this cluster has
been observed independently on two masks and can be identified via
its number on the other mask. In this case the velocity is the mean
value from the two masks.
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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 A6 --- [DRG2004] Identifier (NN:NNN) (G1)
10- 13 I4 km/s CVel1 This paper correlation measurement velocity
15- 16 I2 km/s e_CVel1 rms uncertainty on CVel1
18- 21 I4 km/s CVel2 Other correlation measurement velocity
23- 25 I3 km/s e_CVel2 rms uncertainty on CVel2
27- 36 A10 --- Oname Other name (1)
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Note (1): The denomination references are as follows:
Keck = Kissler-Patig et al., 1998AJ....115..105K 1998AJ....115..105K ([KBS98] NN in Simbad)
NTT = Minniti et al., 1998AJ....115..121M 1998AJ....115..121M ([MKG98] NNN in Simbad)
AAT = Grillmair et al., 1994ApJ...422L...9G 1994ApJ...422L...9G ([KGM99] aat NN in Simbad)
2dF = Drinkwater et al., 2001, AAO Newsl., 97, 9
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Global notes:
Note (G1):
We used an identifier consisting of two two-digit numbers, the first
indicating the mask and the second the aperture number on the mask
that was assigned during the extraction process.
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History:
From electronic version of the journal
References:
Dirsch et al., Paper I 2003AJ....125.1908D 2003AJ....125.1908D
Richtler et al., Paper II 2004AJ....127.2094R 2004AJ....127.2094R
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jul-2004