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HUBBLE SPACE TELESCOPE IMAGING OF GLOBULAR CLUSTERS IN TWO FACE-ON LOW SURFACE BRIGHTNESS GALAXIES UGC 5981 AND UGC 6614

  • Kim, Ji-Hoon (Center for the Exploration of the Origin of the Universe, Department of Physics and Astronomy, Seoul National University)
  • Received : 2011.02.28
  • Accepted : 2011.08.09
  • Published : 2011.10.31

Abstract

We present a study searching for globular cluster systems (GCSs) of two face-on low surface bright- ness galaxies (LSBGs), UGC 5981 and UGC 6614. Based on HSTWFPC2 images of F555Wand F814W filters, we detect 12 and 18 GC candidates for UGC 5981 and UGC 6614, respectively. Although these two LSBGs have very different bulge properties, they have very similar specific frequencies ($S_N$) of 0.1. However, $S_N$ ~ 0.1 is quite small even for their late morphological types, albeit within errors. This suggests that LSBGs have had star formation histories lacking dominant initial starburst events while accumulating their stellar masses through sporadic star formation activities.

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