2006MNRAS.373.1451R

Query : 2006MNRAS.373.1451R

2006MNRAS.373.1451R - Mon. Not. R. Astron. Soc., 373, 1451-1460 (2006/December-3)

Dynamical friction in constant density cores: a failure of the Chandrasekhar formula.

READ J.I., GOERDT T., MOORE B., PONTZEN A.P., STADEL J. and LAKE G.

Abstract (from CDS):

Using analytic calculations and N-body simulations we show that in constant density (harmonic) cores, sinking satellites undergo an initial phase of very rapid (super-Chandrasekhar) dynamical friction, after which they experience no dynamical friction at all. For density profiles with a central power law profile, ρ ∝ r–α, the infalling satellite heats the background and causes α to decrease. For α < 0.5 initially, the satellite generates a small central constant density core and stalls as in the α = 0 case.

We discuss some astrophysical applications of our results to decaying satellite orbits, galactic bars and mergers of supermassive black hole binaries. In a companion paper we show that a central constant density core can provide a natural solution to the timing problem for Fornax's globular clusters.


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): galaxies: - dwarf - galaxies: - kinematics and dynamics

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
2 NAME Local Group GrG ~ ~           ~ 9325 0

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