Dwarf spheroidal galaxies and the mass of the neutrino

Ortwin E. Gerhard; David N. Spergel

doi:10.1086/186336

Dwarf spheroidal galaxies and the mass of the neutrino

Ortwin E. Gerhard, David N. Spergel

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

We argue that neutrinos cannot provide the missing mass in Draco and Ursa Minor, since for reasonable neutrino mass (m_ν ∼ 30 eV) phase-space limits would then require very large core radii (∼10 kpc) and masses (∼4 × 10¹¹ M_⊙) for these dwarfs, which would make their dynamical friction decay times in the Galactic halo significantly shorter than a Hubble time. These limits are insensitive to assumptions about the anisotropy of the neutrino distribution.

Original language	English (US)
Pages (from-to)	L9-L11
Journal	Astrophysical Journal
Volume	389
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/186336
State	Published - Apr 10 1992

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Dark matter
Galaxies: local group

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10.1086/186336

Cite this

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abstract = "We argue that neutrinos cannot provide the missing mass in Draco and Ursa Minor, since for reasonable neutrino mass (mν ∼ 30 eV) phase-space limits would then require very large core radii (∼10 kpc) and masses (∼4 × 1011 M⊙) for these dwarfs, which would make their dynamical friction decay times in the Galactic halo significantly shorter than a Hubble time. These limits are insensitive to assumptions about the anisotropy of the neutrino distribution.",

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N2 - We argue that neutrinos cannot provide the missing mass in Draco and Ursa Minor, since for reasonable neutrino mass (mν ∼ 30 eV) phase-space limits would then require very large core radii (∼10 kpc) and masses (∼4 × 1011 M⊙) for these dwarfs, which would make their dynamical friction decay times in the Galactic halo significantly shorter than a Hubble time. These limits are insensitive to assumptions about the anisotropy of the neutrino distribution.

AB - We argue that neutrinos cannot provide the missing mass in Draco and Ursa Minor, since for reasonable neutrino mass (mν ∼ 30 eV) phase-space limits would then require very large core radii (∼10 kpc) and masses (∼4 × 1011 M⊙) for these dwarfs, which would make their dynamical friction decay times in the Galactic halo significantly shorter than a Hubble time. These limits are insensitive to assumptions about the anisotropy of the neutrino distribution.

KW - Dark matter

KW - Galaxies: local group

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JF - Astrophysical Journal

IS - 1 PART 2

ER -

Dwarf spheroidal galaxies and the mass of the neutrino

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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