Helium Sedimentation and the UV Upturn in the Brightest Cluster Galaxies

Details Helium Sedimentation and the UV Upturn in the Brightest Cluster Galaxies Helium Sedimentation and the UV Upturn in the Brightest Cluster Galaxies

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21537606p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #376.06; Bulletin of the American Astronomical Society, Vol. 42, p.585

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent observations with Galaxy Evolution Explorer (GALEX) show strong unexpected 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 high value of He abundance. In this work, we propose that 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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