Large Magellanic Cloud microlensing and very thick discs

Details Large Magellanic Cloud microlensing and very thick discs Large Magellanic Cloud microlensing and very thick discs

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.304..281g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 304, Issue 2, pp. 281-287.

Astronomy and Astrophysics

Astronomy

14

Galaxy: Halo, Magellanic Clouds, Dark Matter, Gravitational Lensing

Scientific paper

We investigate the implications of a very thick (scaleheight 1.5-3.0 kpc) disc population of MACHOs. Such a population represents a reasonable alternative to standard halo configurations of a lensing population. We find that very thick disc distributions can lower the lens mass estimate derived from the microlensing data towards the LMC, although an average lens mass substantially below 0.3 M_solar is unlikely. Constraints from direct searches for such lenses imply very low-luminosity objects; thus thick discs do not solve the microlensing lens problem. We discuss further microlensing consequences of very thick disc populations, including an increased probability for parallax events.

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