{"paper":{"title":"Theory of pixel lensing towards M31 -- II. The velocity anisotropy and flattening of the MACHO distribution","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Gould (Ohio State), B.J. Carr (Queen Mary, D. Valls-Gabaud (Toulouse), J. An (Cambridge), J. Kaplan (College de France), London), N.W. Evans (Cambridge), P. Baillon (CERN), P. Hewett (Cambridge), S.J. Smartt (Cambridge), S. Paulin-Henriksson (College de France), The POINT--AGAPE Collaboration: E. Kerins (Liverpool JMU), Y. Giraud-Heraud (College de France), Y. Tsapras (Queen Mary","submitted_at":"2003-07-15T17:49:12Z","abstract_excerpt":"The POINT-AGAPE collaboration is currently searching for massive compact halo objects (MACHOs) towards the Andromeda galaxy (M31). The survey aims to exploit the high inclination of the M31 disk, which causes an asymmetry in the spatial distribution of M31 MACHOs. Here, we investigate the effects of halo velocity anisotropy and flattening on the asymmetry signal using simple halo models. For a spherically symmetric and isotropic halo, we find that the underlying pixel-lensing rate in far-disk M31 MACHOs is more than 5 times the rate of near-disk events. We find that the asymmetry is increased "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0307284","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}