Understanding the Cosmic Mass Function High-Mass Behavior | Zendy

J. BetancortRijo | Zendy; Antonio D. Montero-Dorta | Zendy

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Understanding the Cosmic Mass Function High-Mass Behavior

Author(s) -

J. BetancortRijo,

Antonio D. Montero-Dorta

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/507702

Subject(s) - cosmic cancer database , physics , function (biology) , center of mass (relativistic) , limit (mathematics) , center (category theory) , astrophysics , work (physics) , ellipsoid , statistical physics , classical mechanics , mathematical analysis , mathematics , astronomy , quantum mechanics , chemistry , energy–momentum relation , evolutionary biology , biology , crystallography

We claim that the discrepancy found between theoretical predictions for thecosmic mass function and those found in numerical simulations is due to thefact that in deriving the former all mass elements are assumed to be at thecenter of the object they belong to (the all-mass-at-center problem). By anappropriate treatment of this problem, using the spherical collapse model(which is not a bad approximation in the high mass limit), we obtain both thehigh mass behaviour found in simulations and the true assymptotic behaviour ofthe mass function (for arbitrarily high masses). Therefore, we conclude that bycombining ellipsoidal dynamics with a suitable treatment of theall-mass-at-center problem (that we will show in a follow up work) atheoretical prediction for the cosmic mass function in full agreement withsimulations may be obtained.Comment: 4 pages, 2 figures, ApJ letters Accepte

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