VVV survey microlensing: Candidate events with a source in the far disk

María Gabriela Navarro, Dante Minniti, Rodrigo Contreras Ramos

Research output: Contribution to journalArticlepeer-review

Abstract

The VVV microlensing search has recently surveyed the region of the Galactic plane at b = 0 within -10.00 ≼ 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 might 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. 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 (tE = 49.3 ± 7.9 days) than the mean of the timescale distribution for the bulge red clump sources (tE = 36.4 ± 1.1 days). We conclude that the population of microlensing events in the region -10.00 ≼ 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 future microlensing plans with the Roman Space Telescope (formerly WFIRST) in the near-IR.

Original languageEnglish
Article number35
JournalAstrophysical Journal
Volume902
Issue number1
DOIs
Publication statusPublished - 10 Oct 2020

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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