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

Abstract:

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...

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Publication status:
Published

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Authors


Pontzen, AP More by this author
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Journal:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume:
373
Issue:
4
Pages:
1451-1460
Publication date:
2006-12-21
DOI:
EISSN:
1365-2966
ISSN:
0035-8711
URN:
uuid:0fda732d-5643-4ead-925b-532448f7ead5
Source identifiers:
160355
Local pid:
pubs:160355

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