Particle Astrophysics Seminar: Optical Cosmic Survey at the Low Surface Brightness limit: Detection of Diffuse Light in Galaxies and Galaxy Clusters

  • June 29, 2020, 2:00 pm US/Central
  • Yuanyuan Zhang, FNAL

Abstract: The enormous amount of data collected by DES provides a great opportunity to explore low surface brightness science, such as faint diffuse light in galaxies and galaxy clusters. Through stacking the images of ~300 galaxy clusters from the Dark Energy Survey, we report the detection of diffuse intra-cluster light beyond a surface brightness limit of 30 mag/arcsec^2 out to 1 Mpc from cluster center. Despite their low surface brightness, our studies show that intra-cluster light is a significant component of galaxy cluster light. The stacking method is also applied to characterizing the light profile of luminous red galaxies to 200 kpc from their centers, as well as studying the aureole component of DECam point spread function to 30 arcsecond and beyond. Weak lensing and precision photometry calibration may wish to consider these effects in future studies.

For more information, please contact Yu-Dai Tsai at