J/A+A/564/L3 JHK photometry of NGC 3115 globular clusters (Cantiello+, 2014)
Globular clusters of NGC 3115 in the near-infrared. Demonstrating the
correctness of two opposing scenarios.
Cantiello M., Blakeslee J.P., Raimondo G., Chies-Santos A.L.,
Jennings Z.G., Norris M.A., Kuntschner H.
<Astron. Astrophys. 564, L3 (2014)>
=2014A&A...564L...3C 2014A&A...564L...3C
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry, infrared
Keywords: galaxies: elliptical and lenticular, cD -
galaxies: individual: NGC 3115 - galaxies: star clusters: general
Abstract:
We combined new near-infrared VLT/HAWK-I data of the globular clusters
(GCs) in the isolated edge-on S0 galaxy NGC 3115 with optical and
spectroscopic ones taken from the literature, with the aim of
analyzing the multiband GC color distributions. A recent study from
the SLUGGS survey has shown that the GCs in this galaxy follow a
bimodal distribution of CaII triplet indices. Thus, NGC3115 presents a
critical example of a GC system with multiple, distinct, metallicity
subpopulations, and this may argue against the "projection" scenario,
which posits that the ubiquitous color bimodality mainly results from
nonlinearities in the color- metallicity relations. Using optical,
NIR, and spectroscopic data, we found strong and consistent evidence
of index bimodality, which independently confirms the metallicity
bimodality in NGC 3115 GCs. At the same time, we also found evidence
for some color-color nonlinearity. Taken in the broader context of
previous studies, the multicolor consistency of the GC bimodality in
NGC 3115 suggests that in cases where GC systems exhibit clear
differences between their optical and optical-NIR color distributions
(as in some giant ellipticals), the apparent inconsistencies most
likely result from nonlinearities in the color-metallicity relations.
Description:
Here, we report the catalogue built from the matching of J, H, and Ks
band HAWK-I imaging data of NGC3115. The sample contains 1405 objects,
including Globular Clusters host by NGC3115, foreground stars and
background galaxies. All magnitudes are in the AB mag photometric
system, uncorrected for extinction.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 71 1405 Catalog of JHKs sources with VLT/HAWK-I
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [1/1405] ID number of the source
6- 15 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
17- 26 F10.6 deg DEdeg Declination in decimal degrees (J2000)
28- 33 F6.3 mag Jmag HAWK-I J band aperture magnitude (AB mag)
35- 39 F5.3 mag e_Jmag Uncertainty in Jmag
41- 46 F6.3 mag Hmag HAWK-I H band aperture magnitude (AB mag)
48- 52 F5.3 mag e_Hmag Uncertainty in Hmag
54- 59 F6.3 mag Ksmag HAWK-I Ks band aperture magnitude (AB mag)
61- 65 F5.3 mag e_Ksmag Uncertainty in Ksmag
67- 71 F5.3 --- Cl [0/1] SExtractor mean JHKs "CLASS_STAR"
parameter (1=stellar profile)
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Acknowledgements:
Michele Cantiello, cantiello(at)oa-teramo.inaf.it
(End) Patricia Vannier [CDS] 10-Mar-2014