J/A+A/657/A93 Fornax globular clusters (Chaturvedi+, 2022)
The Fornax Cluster VLT Spectroscopic Survey. III.
Kinematical characterisation of globular clusters in the Fornax galaxy cluster.
Chaturvedi A., Hilker M., Cantiello M., Napolitano N.R., van de Ven G.,
Spiniello C., Fahrion K., Paolillo M., Gatto M., Puzia T.
<Astron. Astrophys. 657, A93 (2022)>
=2022A&A...657A..93C 2022A&A...657A..93C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Clusters, globular ; Photometry, SDSS
Keywords: catalogs - galaxies: clusters: individual: Fornax -
galaxies: star clusters: general - galaxies: kinematics and dynamics
Abstract:
The Fornax cluster provides an unparalleled opportunity of
investigating the formation and evolution of early-type galaxies in a
dense environment in detail. We aim at kinematically characterising
photometrically detected globular cluster (GC) candidates in the core
of the cluster. We used VLT/VIMOS spectroscopic data from the FVSS
survey in the Fornax cluster, covering one square degree around the
central massive galaxy NGC 1399. We confirm a total of 777 GCs, almost
doubling previously detected GCs, using the same dataset as was used
before. Combined with previous literature radial velocity measurements
of GCs in Fornax, we compile the most extensive spectroscopic GC
sample of 2341 objects in this environment. We found that red GCs are
mostly concentrated around major galaxies, while blue GCs are
kinematically irregular and are widely spread throughout the core
region of the cluster. The velocity dispersion profiles of blue and
red GCs show a quite distinct behaviour. Blue GCs exhibit a sharp
increase in the velocity dispersion profile from 250 to 400km/s within
5 arcminutes (∼29kpc∼1reff of NGC 1399) from the central galaxy.
The velocity dispersion profile of red GCs follows a constant value
between 200-300km/s until 8 arcminutes (∼46kpc∼1.6reff, and then
rises to 350km/s at 10 arcminutes (∼58kpc∼2reff). Beyond 10
arcminutes and out to 40 arcminutes (∼230kpc∼8reff), blue and red
GCs show a constant velocity dispersion of 300±50km/s, indicating
that both GC populations trace the cluster potential. We kinematically
confirm and characterise the previously photometrically discovered
overdensities of intra-cluster GCs. We found that these substructured
intra-cluster regions in Fornax are dominated mostly by blue GCs.
Description:
This file contains the catalogue of spectroscopically confirmed
globular clusters. Column list:(1) GC named as in the VIMOS pointing
id; (2) CGs named as in the FVSS ID (FVSSIIIGC:RA-DEC); (3) right
ascension; (4) declination; (5) GC radial velocity; (6) radial
velocity uncertainty; (7) spectral S/N; (8) GC object class; (9) FDS
ID (10) right ascension (FDS); (11) declination (FDS); (12-13) g-band
magnitude with error; (14-15) r-band magnitude and its error; (16-17)
i-band magnitude and its error; (18-19) u-band magnitude and its
error.
Magnitude information for each GC in g,r, i, and u band were obtained
from the matched FDS photometric catalogue presented by Cantiello et
al. (2020A&A...639A.136C 2020A&A...639A.136C, Cat. J/A+A/639/A136).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 234 851 Catalogue of spectroscopically confirmed
globular clusters
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See also:
J/A+A/639/A136 : The Fornax Deep Survey with the VST. IX. (Cantiello+, 2020)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- PointName GC named as in the VIMOS pointing id
28- 56 A29 --- FVSS-GC CGs named as in the FVSS ID (FVSSIIIGC:RA-DEC)
58- 75 F18.15 deg RAdeg Right ascension (J2000)
77- 95 F19.15 deg DEdeg Declination (J2000)
97-103 F7.2 km/s RV GC radial velocity
105-110 F6.2 km/s e_RV GC radial velocity uncertainty
112-130 F19.16 --- S/N Spectral signal to noise ratio
132 A1 --- Class [ABC] GC object class
134-156 A23 --- FDS FDS ID, FDSJHHMMSS.ss+DDMMSS.ss (1)
158-167 F10.7 deg RAFdeg ?=- Right ascension (FDS) (1)
169-178 F10.6 deg DEFdeg ?=- Declination (FDS) (1)
180-185 F6.3 mag gmag ?=- g band PSF corrected magnitude (1)
187-192 F6.4 mag e_gmag ?=- rms uncertainty g-band magnitude (1)
194-199 F6.3 mag rmag ?=- r band PSF corrected magnitude (1)
201-206 F6.4 mag e_rmag ?=- rms uncertainty r-band magnitude (1)
208-213 F6.3 mag imag ?=- i band PSF corrected magnitude (1)
215-220 F6.4 mag e_imag ?=- rms uncertainty i-band magnitude (1)
222-227 F6.3 mag umag ?=- u band PSF corrected magnitude (1)
229-234 F6.4 mag e_umag ?=- rms uncertainty u-band magnitude (1)
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Note (1): from Cantiello et al. (2020A&A...639A.136C 2020A&A...639A.136C, Cat. J/A+A/639/A136).
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Acknowledgements:
Avinash Chaturvedi, avinash.chaturvedi(at)eso.org
References:
Pota et al., Paper I 2018MNRAS.481.1744P 2018MNRAS.481.1744P
Spiniello et al., Paper II 2018MNRAS.477.1880S 2018MNRAS.477.1880S
(End) Patricia Vannier [CDS] 27-Dec-2021