Open AccessOn the intrinsic bias in detecting caustic crossings between Galactic halo and self‐lensing events in the Magellanic Clouds
Author(s) -
Han Cheongho
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.02787.x
Subject(s) - gravitational microlensing , physics , galactic halo , astrophysics , halo , gravitational lens , astronomy , caustic (mathematics) , large magellanic cloud , binary number , lens (geology) , galaxy , optics , arithmetic , mathematics , redshift , mathematical physics
In this paper, we investigate the intrinsic bias in detecting caustic crossings between the Galactic halo and self‐lensing gravitational microlensing events in the Magellanic Clouds. For this, we determine the region for optimal caustic‐crossing detection in the parameter space of the physical binary separations, ℓ, and the total binary lens mass, M , and find that the optimal regions for both populations of events are similar to each other. In particular, if the Galactic halo is composed of lenses with the claimed average mass of 〈 M 〉∼0.5 M ⊙ , the optimal binary separation range of Galactic halo events of 3.5 au≲ℓ≲14 au matches well with that of a Magellanic Cloud self‐lensing event caused by a binary lens with a total mass of M ∼1 M ⊙ ; well within the mass range of the most probable lens population of stars in the Magellanic Clouds. Therefore, our computation implies that if the binary fractions and the distributions of binary separations of the two populations of lenses are not significantly different from each other, there is no strong detection bias against Galactic halo caustic‐crossing events.