White Dwarfs and Dark Matter
نویسندگان
چکیده
منابع مشابه
White dwarfs and dark matter.
Based on the identification of 38 white dwarfs with halo kinematics, in a survey covering 10% of the sky near the south galactic pole, Oppenheimer et al. (1) argued that at least 2% of the dark matter in the Milky Way galaxy has now been detected directly. Put into context, the Oppenheimer et al. result implies that the stellar remnant mass of the halo may be comparable to that of the entire di...
متن کاملWhite dwarfs and Galactic dark matter
We discuss the recent discovery by Oppenheimer et al (2001) of old, cool white dwarf stars, which may be the first direct detection of Galactic halo dark matter. We argue here that the contribution of more mundane white dwarfs of the stellar halo and thick disk would contribute sufficiently to explain the new high velocity white dwarfs without invoking putative white dwarfs of the dark halo. Th...
متن کاملChemical Abundance Constraints on White Dwarfs as Halo Dark Matter
We examine the chemical abundance constraints on a population of white dwarfs in the Halo of our Galaxy. We are motivated by microlensing experiments which have reported evidence for massive compact halo objects (Machos) in the Halo of our Galaxy, with an estimated mass of (0.1 − 1)M⊙; the only conventional dark astrophysical candidates for objects in this mass range are white dwarfs. However, ...
متن کاملThe contribution of red dwarfs and white dwarfs to the halo dark matter
Context. The nature of the several microlensing events observed by the MACHO team towards the LMC still remains controversial. Low–mass substellar objects and stars with masses larger than ∼1 M have been ruled out as major components of a MACHO Galactic halo, while stars of half solar masses are the most probable candidates. Aims. We assess jointly the relative contributions of both red dwarfs ...
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The results of a large radial velocity survey of the Draco and Ursa Minor dwarf spheroidal galaxies are presented. The velocity dispersion profiles of both objects are very similar: initially the dispersion increases with radius, while at radii approaching the outer limit of the stellar distribution we observe a sharp fall-off. We present the results of mass modeling based on these new data the...
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ژورنال
عنوان ژورنال: Science
سال: 2001
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.292.5525.2211a