A New Component of the Milky Way

Details A New Component of the Milky Way A New Component of the Milky Way

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.2901g&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #29.01; Bulletin of the American Astronomical Society, Vol. 31, p.1412

Astronomy and Astrophysics

Astronomy

Scientific paper

We suggest a new component of the Milky Way galaxy that can account for both the optical depth and the event durations obtained by the MACHO microlensing survey toward the LMC. This component is consistent with recent evidence for a significant population of faint white dwarf stars detected in a proper motion study of the Hubble Deep field. This new component, the extended protodisk, consists of (mostly) old white dwarf stars whose distribution extends beyond the traditional thin and thick disks but well within the dark CDM halo. The total mass in this component is 7-9 x 1010 Msun.

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