Unstable Cold Dark Matter and the Cuspy Halo Problem in Dwarf Galaxies | Zendy

F. J. Snchez-Salcedo | Zendy

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Unstable Cold Dark Matter and the Cuspy Halo Problem in Dwarf Galaxies

Author(s) -

F. J. Snchez-Salcedo

Publication year - 2003

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 - 10.1086/377092

Subject(s) - physics , cuspy halo problem , dwarf galaxy problem , astrophysics , dark matter halo , cold dark matter , dwarf galaxy , dark matter , astronomy , halo , hot dark matter , dark galaxy , galaxy , galactic halo , dwarf spheroidal galaxy , interacting galaxy , cosmology , dark energy

We speculate that the dark halos of dwarf galaxies and low surface brightnessgalaxies soften their central cusps by the decay of a fraction of cold darkmatter (CDM) particles to a stable particle with a recoiling velocity of a fewtens km s$^{-1}$, after they have driven the formation of galactic halos. Thisprocess, however, does not necessarily produce a significant reduction of thecentral dark matter density of satellite dwarf spheroidals like Draco orFornax. It is shown that the recovered distribution of concentration parameters$c$ for the initial (before decay) Navarro-Frenk-White halos, is in goodagreement with CDM predictions. Other interesting potentials of unstable CDMare highlighted.Comment: 5 pages, 1 figure, accepted for publication in ApJ

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