Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 705, Issue 1, Pages L58-L61Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/705/1/L58
Keywords
diffusion; galaxies: clusters: general; galaxies: elliptical and lenticular, cD; ultraviolet: galaxies
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Funding
- Sherman Fairchild Foundation
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Recent observations with the Galaxy Evolution Explorer (GALEX) show strong unexpected ultraviolet (UV) excess in the spectrum of brightest cluster galaxies (BCGs). It is believed that the excess UV signal is produced by old and evolved core-He burning stars, and the UV flux strength could be greatly enhanced if the progenitor stars have a high value of He abundance. In this work, we propose that the sedimentation process can greatly enhance the He abundance in BCGs. Our model predicts that the UV flux strength is stronger in more massive, low-redshift, and dynamically relaxed BCGs. These predictions are testable with the current generation of GALEX+SDSS observations.
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