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Published October 2003 | Published + Accepted Version
Journal Article Open

2MASS Studies of Differential Reddening across Three Massive Globular Clusters


J-, H-, and Ks-band data from the Two Micron All Sky Survey (2MASS) are used to study the effects of differential reddening across the three massive Galactic globular clusters ω Centauri, NGC 6388, and NGC 6441. Evidence is found that variable extinction may produce false detections of tidal tails around ω Centauri. We also investigate what appears to be relatively strong differential reddening toward NGC 6388 and NGC 6441 and find that differential extinction may be exaggerating the need for a metallicity spread to explain the width of the red giant branches for these two clusters. Finally, we consider the implications of these results for the connection between unusual, multipopulation globular clusters and the cores of dwarf spheroidal galaxies (dSph).

Additional Information

© 2003. The American Astronomical Society. Received 2003 May 19; accepted 2003 June 19. The authors would like to thank S. Leon and G. Meylan for helpful discussion regarding the effects of reddening on ω Centauri. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration and the National Science Foundation. This work has been undertaken with the support of NASA/JPL contract 1228235 as well as a David and Lucille Packard Foundation Fellowship.

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October 23, 2023