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The Contribution of Halos with Different Mass Ratios to the Overall Growth of Cluster-Sized Halos | | Doron Lemze
; Marc Postman
; Shy Genel
; Holland C. Ford
; Italo Balestra
; Megan Donahue
; Daniel Kelson
; Mario Nonino
; Amata Mercurio
; Andrea Biviano
; Piero Rosati
; Keiichi Umetsu
; David Sand
; Anton Koekemoer
; Massimo Meneghetti
; Peter Melchior
; Andrew B. Newman
; Waqas A. Bhatti
; G. Mark Voit
; Elinor Medezinski
; Adi Zitrin
; Wei Zheng
; Tom Broadhurst
; Matthias Bartelmann
; Narciso Benitez
; Rychard Bouwens
; Larry Bradley
; Dan Coe
; Genevieve Graves
; Claudio Grillo
; Leopoldo Infante
; Yolanda Jimenez-Teja
; Stephanie Jouvel
; Ofer Lahav
; Dan Maoz
; Julian Merten
; Alberto Molino
; John Moustakas
; Leonidas Moustakas
; Sara Ogaz
; Marco Scodeggio
; Stella Seitz
; | | Date: |
7 Aug 2013 | | Abstract: | We provide a new observational test for a key prediction of the Lambda CDM
cosmological model: the contributions of mergers with different
halo-to-main-cluster mass ratios to cluster-sized halo growth. We perform this
test by dynamically analyzing seven galaxy clusters, spanning the redshift
range $0.13 < z_c < 0.45$ and caustic mass range $0.4-1.5$ $10^{15}
h_{0.73}^{-1}$ M$_{odot}$, with an average of 293 spectroscopically-confirmed
bound galaxies to each cluster. The large radial coverage (a few virial radii),
which covers the whole infall region, with a high number of spectroscopically
identified galaxies enables this new study. For each cluster, we identify bound
galaxies. Out of these galaxies, we identify infalling and accreted halos and
estimate their masses and their dynamical states. Using the estimated masses,
we derive the contribution of different mass ratios to cluster-sized halo
growth. For mass ratios between ~0.2 and ~0.7, we find a ~1 $sigma$ agreement
with Lambda CDM expectations based on the Millennium simulations I and II. At
low mass ratios, $lesssim 0.2$, our derived contribution is underestimated
since the detection efficiency decreases at low masses, $sim 2 imes 10^{14}$
$h_{0.73}^{-1}$ M$_{odot}$. At large mass ratios, $gtrsim 0.7$, we do not
detect halos probably because our sample, which was chosen to be quite X-ray
relaxed, is biased against large mass ratios. Therefore, at large mass ratios,
the derived contribution is also underestimated. | | Source: | arXiv, 1308.1675 | | Services: | Forum | Review | PDF | Favorites | |
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