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24 April 2024 |
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The Cluster Mass Function from Early SDSS Data: Cosmological Implications | | Neta A. Bahcall
; Feng Dong
; Paul Bode
; Rita Kim
; James Annis
; Timothy A. McKay
; Sarah Hansen
; James Gunn
; Jeremiah P. Ostriker
; Marc Postman
; Robert C. Nichol
; Tomotsugu Goto
; Jon Brinkmann
; Gillian R. Knapp
; Don O. Lamb
; Donald P. Schneider
; Michael S. Vogeley
; Donald G. York ( Princeton
; JHU
; Fermilab
; Michigan
; STScI
; CMU
; APO
; Chicago
; PSU
; | | Date: |
29 May 2002 | | Journal: | Astrophys.J. 585 (2003) 182-190 | | Subject: | astro-ph | | Affiliation: | 10), Donald G. York ( Princeton, JHU, Fermilab, Michigan, STScI, CMU, APO, Chicago, PSU, (10) Drexel | | Abstract: | The mass function of clusters of galaxies is determined from 400 deg^2 of early commissioning imaging data of the Sloan Digital Sky Survey; ~300 clusters in the redshift range z = 0.1 - 0.2 are used. Clusters are selected using two independent selection methods: a Matched Filter and a red-sequence color magnitude technique. The two methods yield consistent results. The cluster mass function is compared with large-scale cosmological simulations. We find a best-fit cluster normalization relation of sigma_8*omega_m^0.6 = 0.33 +- 0.03 (for 0.1 ~< omega_m ~< 0.4), or equivalently sigma_8 = (0.16/omega_m)^0.6. The amplitude of this relation is significantly lower than the previous canonical value, implying that either omega_m is lower than previously expected (omega_m = 0.16 if sigma_8 = 1) or sigma_8 is lower than expected (sigma_8 = 0.7 if omega_m = 0.3). The best-fit mass function parameters are omega_m = 0.19 (+0.08,-0.07) and sigma_8 = 0.9 (+0.3,-0.2). High values of omega_m (>= 0.4) and low sigma_8 (=< 0.6) are excluded at >~ 2 sigma. | | Source: | arXiv, astro-ph/0205490 | | Services: | Forum | Review | PDF | Favorites | |
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