Optical and infrared photometry of globular clusters in NGC1399: Evidence for color-metallicity nonlinearity

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/746/1/88
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume746
Issue1
Article number88
AbstractWe combine new Wide Field Camera 3 IR Channel (WFC3/IR) F160W (H 160) imaging data for NGC1399, the central galaxy in the Fornax cluster, with archival F475W (g 475), F606W (V 606), F814W (I 814), and F850LP (z 850) optical data from the Advanced Camera for Surveys (ACS). The purely optical g 475 - I 814, V 606 - I 814, and g 475 - z 850 colors of NGC1399's rich globular cluster (GC) system exhibit clear bimodality, at least for magnitudes I 814 > 21.5. The optical-IR I 814 - H 160 color distribution appears unimodal, and this impression is confirmed by mixture modeling analysis. The V 606 - H 160 colors show marginal evidence for bimodality, consistent with bimodality in V 606 - I 814 and unimodality in I 814 - H 160. If bimodality is imposed for I 814 - H 160 with a double Gaussian model, the preferred blue/red split differs from that for optical colors; these "differing bimodalities" mean that the optical and optical-IR colors cannot both be linearly proportional to metallicity. Consistent with the differing color distributions, the dependence of I 814 - H 160 on g 475 - I 814 for the matched GC sample is significantly nonlinear, with an inflection point near the trough in the g 475 - I 814 color distribution; the result is similar for the I 814 - H 160 dependence on g 475 - z 850 colors taken from the ACS Fornax Cluster Survey. These g 475 - z 850 colors have been calibrated empirically against metallicity; applying this calibration yields a continuous, skewed, but single-peaked metallicity distribution. Taken together, these results indicate that nonlinear color-metallicity relations play an important role in shaping the observed bimodal distributions of optical colors in extragalactic GC systems. © 2012. The American Astronomical Society. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269461
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Record identifier3f5b19a2-f816-4716-ae98-19919c83d683
Record created2013-12-12
Record modified2016-07-18
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