2MASS Studies of Differential Reddening Across Three Massive Globular Clusters

Details 2MASS Studies of Differential Reddening Across Three Massive Globular Clusters 2MASS Studies of Differential Reddening Across Three Massive Globular Clusters

2003-05-21

arxiv.org/abs/astro-ph/0305385v2

Astron.J. 126 (2003) 1871

Astronomy and Astrophysics

Astrophysics

40 pages, 14 figures. Accepted for publication in Oct. 2003 AJ

Scientific paper

10.1086/377626

J, H, and K_S 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 Omega Centauri, NGC 6388, and NGC 6441. Evidence is found that variable extinction may produce false detections of tidal tails around Omega Centauri. We also investigate what appears to be relatively strong differential reddening towards 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).

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