ROME/REA: Three-year, Tri-color Timeseries Photometry of the Galactic Bulge
arxiv(2024)
摘要
The ROME/REA (Robotic Observations of Microlensing Events/Reactive Event
Assessment) Survey was a Key Project at Las Cumbres Observatory (hereafter LCO)
which continuously monitored 20 selected fields (3.76 sq.deg.) in the Galactic
Bulge throughout their seasonal visibility window over a three-year period,
between March 2017 and March 2020. Observations were made in three optical
passbands (SDSS-g', -r', -i'), and LCO's multi-site telescope network enabled
the survey to achieve a typical cadence of ∼10 hrs in i' and 15 hrs in
g' and r'. In addition, intervals of higher cadence (<1 hr) data were obtained
during monitoring of key microlensing events within the fields. This paper
describes the Difference Image Analysis data reduction pipeline developed to
process these data, and the process for combining the photometry from LCO's
three observing sites in the Southern Hemisphere. The full timeseries
photometry for all 8 million stars, down to a limiting magnitude of i 18 mag is
provided in the data release accompanying this paper, and samples of the data
are presented for exemplar microlensing events, illustrating how the tri-band
data are used to derive constraints on the microlensing source star parameters,
a necessary step in determining the physical properties of the lensing object.
The timeseries data also enables a wealth of additional science, for example in
characterizing long-timescale stellar variability, and a few examples of the
data for known variables are presented.
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