Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 782, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/782/2/L39
Keywords
galaxies: dwarf; galaxies: evolution; galaxies: formation; galaxies: individual (Fornax dwarf galaxy, Sculptor dwarf galaxy); Local Group
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Funding
- DNRF
- University of Waterloo
- Perimeter Institute for Theoretical Physics
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research and Innovation
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We combine the detailed star formation histories of the Fornax and Sculptor dwarf spheroidals with the mass assembly history of their dark matter (DM) halo progenitors to estimate if the energy deposited by Type II supernovae (SNe II) is sufficient to create a substantial DMcore. Assuming the efficiency of energy injection of the SNe II into DM particles is is an element of(gc) = 0.05, we find that a single early episode, z greater than or similar to (Z)infall, that combines the energy of all SNe II due to explode over 0.5 Gyr is sufficient to create a core of several hundred parsecs in both Sculptor and Fornax. Therefore, our results suggest that it is energetically plausible to form cores in cold dark matter (CDM) halos via early episodic gas outflows triggered by SNe II. Furthermore, based onCDMmerger rates and phase-space density considerations, we argue that the probability of a subsequent complete regeneration of the cusp is small for a substantial fraction of dwarf-size halos.
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