Spectroscopic quantification of projection effects in the SDSS redMaPPer galaxy cluster catalogue

  title={Spectroscopic quantification of projection effects in the SDSS redMaPPer galaxy cluster catalogue},
  author={J. Myles and D. Gruen and A. Mantz and S. Allen and R. Morris and E. Rykoff and M. Costanzi and C. To and J. Derose and R. Wechsler and E. Rozo and T. Jeltema and E. Carrasco and A. Kremin and R. Kron},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
Projection effects, whereby galaxies along the line-of-sight to a galaxy cluster are mistakenly associated with the cluster halo, present a significant challenge for optical cluster cosmology. We use statistically representative spectral coverage of luminous galaxies to investigate how projection effects impact the low-redshift limit of the Sloan Digital Sky Survey (SDSS) redMaPPer galaxy cluster catalog. Spectroscopic redshifts enable us to differentiate true cluster members from false… Expand

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