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The Faint Optical S...
The Faint Optical Stellar Luminosity Function in the Ursa Minor Dwarf Spheroidal Galaxy
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- Feltzing, Sofia (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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Gilmore, G (författare)
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Wyse, R F G (författare)
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(creator_code:org_t)
- American Astronomical Society, 1999
- 1999
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X. ; 516:1, s. 17-20
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Abstract
Ämnesord
Stäng
- Analyses of their internal stellar kinematics imply that the dwarf spheroidal (dSph) companion galaxies to the Milky Way are among the most dark matter-dominated systems known. Should there be significant dark matter in the form of faint stars in these systems, the stellar luminosity function must be very different from that of a similar metallicity globular cluster, for which there is no evidence for dark matter. We present the faint stellar luminosity function in the Ursa Minor dSph, down to a luminosity corresponding to ~0.45 M_solar, derived from new deep Hubble Space Telescope/WFPC2 data. We find a remarkable similarity between this luminosity function, and inferred initial mass function, and those of the globular cluster M92, a cluster of similar age and metallicity to the Ursa Minor dSph.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- dark mattergalaxies: individual (Ursa Minor)galaxies: kinematics and dynamicsgalaxies: stellar contentstars: luminosity function
- mass function
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