Candidate Gravitational Microlensing Events for Future Direct Lens Imaging
Abstract
The mass of the lenses giving rise to Galactic microlensing events can be constrained by measuring the relative lens-source proper motion and lens flux. The flux of the lens can be separated from that of the source, companions to the source, and unrelated nearby stars with high-resolution images taken when the lens and source are spatially resolved. For typical ground-based adaptive optics (AO) or space-based observations, this requires either inordinately long time baselines or high relative proper motions. We provide a list of microlensing events toward the Galactic Bulge with high relative lens-source proper motion that are therefore good candidates for constraining the lens mass with future high-resolution imaging. We investigate all events from 2004 -- 2013 that display detectable finite-source effects, a feature that allows us to measure the proper motion. In total, we present 20 events with mu >~ 8 mas/yr. Of these, 14 were culled from previous analyses while 6 are new, including OGLE-2004-BLG-368, MOA-2005-BLG-36, OGLE-2012-BLG-0211, OGLE-2012-BLG-0456, MOA-2012-BLG-532, and MOA-2013-BLG-029. In <~12 years the lens and source of each event will be sufficiently separated for ground-based telescopes with AO systems or space telescopes to resolve each component and further characterize the lens system. Furthermore, for the most recent events, comparison of the lens flux estimates from images taken immediately to those estimated from images taken when the lens and source are resolved can be used to empirically check the robustness of the single-epoch method currently being used to estimate lens masses for many events.
Cite
@article{arxiv.1403.3092,
title = {Candidate Gravitational Microlensing Events for Future Direct Lens Imaging},
author = {C. B. Henderson and H. Park and T. Sumi and A. Udalski and A. Gould and Y. Tsapras and C. Han and B. S. Gaudi and V. Bozza and F. Abe and D. P. Bennett and I. A. Bond and C. S. Botzler and M. Freeman and A. Fukui and D. Fukunaga and Y. Itow and N. Koshimoto and C. H. Ling and K. Masuda and Y. Matsubara and Y. Muraki and S. Namba and K. Ohnishi and N. J. Rattenbury and To. Saito and D. J. Sullivan and D. Suzuki and W. L. Sweatman and P. J. Tristram and N. Tsurumi and K. Wada and N. Yamai and P. C. M. Yock and A. Yonehara and M. K. Szymański and M. Kubiak and G. Pietrzyński and I. Soszyński and J. Skowron and S. Kozłowski and R. Poleski and K. Ulaczyk and Ł. Wyrzykowski and P. Pietrukowicz and L. A. Almeida and M. Bos and J. -Y. Choi and G. W. Christie and D. L. Depoy and Subo Dong and M. Friedmann and K. -H. Hwang and F. Jablonski and Y. K. Jung and S. Kaspi and C. -U. Lee and D. Maoz and J. McCormick and D. Moorhouse and T. Natusch and H. Ngan and R. W. Pogge and I. -G. Shin and Y. Shvartzvald and T. -G. Tan and G. Thornley and J. C. Yee and A. Allan and D. M. Bramich and P. Browne and M. Dominik and K. Horne and M. Hundertmark and R. Figuera Jaimes and N. Kains and C. Snodgrass and I. A. Steele and R. A. Street},
journal= {arXiv preprint arXiv:1403.3092},
year = {2015}
}
Comments
10 pages, 8 figures, 6 tables, submitted to ApJ. For a brief video explaining the key results of this paper, please visit: https://www.youtube.com/watch?v=i_dzT8NydJI