Speaker
Yu Shan Cheng
Description
We present a measurement of the redshift enhancement of background galaxies behind clusters. The 3,085 cluster sample is selected from RASS-MCMF with a redshift range of $0.05\leq z<0.4$. The background galaxies are obtained from DESI, including LRGs with redshifts 0.4-1.1 and ELGs with redshifts 0.8-1.6.
The RASS-MCMF clusters are selected within a 10 Mpc of the DESI area. We center on each cluster and measure the redshift enhancement signal over physical radius from 0.03 to 10 Mpc using a modified version of the Davis & Peebles two-point cross-correlation estimator. We find that the signal increases toward smaller cluster-centric radii, consistent with expectations from weak lensing magnification.
| Participate the oral/poster presentation award competition | Yes |
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