On the prospect of inferring the halo structure and the masses of dark objects through parallax microlensing

Details On the prospect of inferring the halo structure and the masses of dark objects through parallax microlensing On the prospect of inferring the halo structure and the masses of dark objects through parallax microlensing

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.299..929m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 299, Issue 4, pp. 929-941.

Astronomy and Astrophysics

Astronomy

3

Galaxy: Fundamental Parameters, Galaxy: Halo, Galaxy: Kinematics And Dynamics, Dark Matter, Gravitational Lensing

Scientific paper

We study the proposed use of parallax microlensing in the direction of the Large Magellanic Cloud (LMC) to separate the effects of the mass function of dark massive halo objects (MHOs or `machos') on the one hand, and their spatial distribution and kinematics on the other. This disentanglement is supposed to allow a much better determination of the two than could be achieved entirely on the basis of the durations of events. We restrict our treatment to the same class of power-law spherical models for the halo of MHOs studied in a previous paper by Markovic 38 Sommer-Larsen, and assume that one can eliminate microlensing events caused by massive objects outside the halo (e.g., the LMC halo). Whereas the duration-based error in the average MHO mass, mu=M/M, exceeds (at N=100 events) mu by a factor of 2 or more, parallax microlensing remarkably brings it down to 15-20 per cent of mu, regardless of the shape of the mass function. In addition, the slope alpha of the mass function, dn/dmu~mu^alpha, can be inferred relatively accurately (sigma_alpha<0.4) for a broader range, -3

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