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J/A+A/611/A93   NGC3115 & NGC1399 VEGAS-SSS globular clusters (Cantiello+, 2018)

VEGAS-SSS. II. Comparing the globular cluster systems in NGC3115 and NGC1399 using VEGAS and FDS survey data. Cantiello M., D'Abrusco R., Spavone M., Paolillo M., Capaccioli M., Limatola L., Grado A., Iodice E., Raimondo G., Napolitano N., Blakeslee J.P., Brocato E., Forbes D.A., Hilker M., Mieske S., Peletier R., Van de Ven G., Schipani P. <Astron. Astrophys. 611, A93 (2018)> =2018A&A...611A..93C (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Clusters, globular Keywords: galaxies: elliptical and lenticular, cD - galaxies: star clusters: general - galaxies: individual: NGC 3115, NGC 1399 - galaxies: clusters: individual: Fornax - galaxies: evolution - galaxies: stellar content Abstract: We analyze the globular cluster (GC) systems in two very different galaxies, NGC 3115 and NGC 1399. With the papers of this series, we aim at highlighting common and different properties in the GC systems in galaxies covering a wide range of parameter space. We compare the GCs in NGC 3115 and NGC 1399 as derived from the analysis of one square degree u-, g-, and i-band images taken with the VST telescope as part of the VST early-type galaxy survey (VEGAS) and Fornax deep survey (FDS). We selected GC candidates using as reference the morpho-photometric and color properties of confirmed GCs. The surface density maps of GCs in NGC 3115 reveal a morphology similar to the light profile of field stars; the same is true when blue and red GCs are taken separately. The GC maps for NGC 1399 are richer in structure and confirm the existence of an intra-cluster GC component. We confirm the presence of a spatial offset in the NGC 1399 GC centroid and find that the centroid of the GCs for NGC 3115 coincides well with the galaxy center. Both GC systems show unambiguous color bimodality in (g-i) and (u-i); the color-color relations of the two GC systems are slightly different with NGC 3115 appearing more linear than NGC 1399. The azimuthal average of the radial density profiles in both galaxies reveals a larger spatial extent for the total GCs population with respect to the galaxy surface brightness profile. For both galaxies, the red GCs have radial density profiles compatible with the galaxy light profile, while the radial profiles for blue GCs are shallower. As for the specific frequency of GCs, SN, we find it is a factor of two higher in NGC 1399 than for NGC 3115; this is mainly the result of extra blue GCs. By inspecting the radial behavior of the specific frequency, SN(<r), for the total, blue, and red GCs, we find notable similarities between the trends for red GCs in the two targets. In spite of extremely different host environments, the red GCs in both cases appear closely linked to the light distribution of field stars. Blue GCs extend to larger galactocentric scales than red GCs, marking a significant difference between the two galaxies: the blue/red GCs and field stellar components of NGC 3115 appear well thermalized with each other and the blue GCs in NGC 1399 appear to fade into an unrelaxed intra-cluster GC population. Description: Photometric catalogs for globular cluster (GC) candidates over the the 1 sq. degree area around NGC3115 and NGC1399 (ngc3115.dat and ngc1399.dat). The catalogues are based on u-, g- and i- band images from the VST elliptical galaxies survey (VEGAS). Aperture magnitudes, corrected for aperture correction are reported. We also provide the full catalogs of matched sources, which also include the matched background and foreground sources in the frames (ngc3115_full.dat and ngc1399_full.dat). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ngc3115.dat 72 1707 Globular cluster candidates positions and magnitudes in NGC3115 ngc1399.dat 72 1589 Globular cluster candidates positions and magnitudes in NGC1399 n3115all.dat 72 78465 Full list of ugi matched sources in the 1 sq. deg area around NGC3115 n1399all.dat 72 20779 Full list of ugi matched sources in the 1 sq. deg area around NGC1399
See also: J/ApJ/808/19 : Megasecond Chandra XVP obs. of NGC3115. II. (Lin+, 2015) J/A+A/576/A14 : VEGAS-SSS photometry of NGC3115 (Cantiello+, 2015) J/A+A/586/A102 : UCDs in the halo of NGC1399 (Voggel+, 2016) J/A+A/611/A21 : Globular cluster candidates in NGC253 (Cantiello+, 2017) Byte-by-byte Description of file: *.dat
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Right ascension (J2000.0) 12- 21 F10.6 deg DEdeg Declination (J2000.0) 23- 30 F8.4 mag umag VST u-band aperture magnitude (1) 32- 38 F7.4 mag e_umag VST u-band magnitude error 40- 47 F8.4 mag gmag VST g-band aperture magnitude (1) 49- 55 F7.4 mag e_gmag VST g-band magnitude error 57- 64 F8.4 mag imag VST i-band aperture magnitude (1) 66- 72 F7.4 mag e_imag VST i-band magnitude error
Note (1): Correction for foreground Galactic extinction according to Schlafly & Finkbeiner (infrared-based) recalibration of the Schlegel et al. (1998ApJ...500..525S) infrared-based dust map. Magnitudes are derived within 8 pixel apeture; aperture correction is applied.
Acknowledgements: Michele Cantiello, cantiello(at) References: Cantiello et al., Paper I 2015A&A...576A..14C, Cat. J/A+A/576/A14
(End) C. Michele [INAF, O.A. Abruzzo, Italy], P. Vannier [CDS] 06-Nov-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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