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      VVV survey microlensing: candidate events with source in the far disk

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          Abstract

          The VVV microlensing search has recently surveyed the region of the Galactic plane at b=0 within -10 < l < 10.44 deg. in the near-infrared (IR), discovering hundreds of microlensing events. In this paper we explore the microlensing events with background sources that could be located in the far disk of the Galaxy, beyond the bulge. We discuss the possible configurations for the microlensing lenses and sources located at different places within the Galactic plane. Then we search for these events using the local red clump centroids of the VVV near-IR color-magnitude diagrams and color-color diagrams. According to the estimated distances and proper motions, N=20 events may have sources located in the far disk. The candidates for far-disk sources show on average longer timescales (t_E= 49.3 +- 7.9 days) than the mean of the timescale distribution for the bulge red clump sources (t_E= 36.4 +- 1.1 days). We conclude that the population of microlensing events in the region -10 < l < 10.44, -0.46 < b < 0.65 deg. contains a non-negligible number of events with candidate far-disk sources ( ~11 %). Our results are relevant in view of the future microlensing plans with the Roman Space Telescope (formerly WFIRST) in the near-IR.

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          Author and article information

          Journal
          14 September 2020
          Article
          2009.06658
          095a2b7a-f5eb-4883-aab0-933683ba9702

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          9 pages, 5 figures and 2 tables. Accepted for publication in ApJ
          astro-ph.SR astro-ph.GA

          Galaxy astrophysics,Solar & Stellar astrophysics
          Galaxy astrophysics, Solar & Stellar astrophysics

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