Author:
Chen I-Kai,Kongsore Marius,Tilburg Ken Van
Abstract
Abstract
The Gaia satellite is cataloging the astrometric properties of an unprecedented
number of stars in the Milky Way with extraordinary precision. This provides a gateway for
conducting extensive surveys of transient astrometric lensing events caused by dark compact
objects. In this work, we establish a data analysis pipeline capable of searching for such events
in the upcoming Gaia Data Release 4 (DR4). We use Gaia Early Data Release 3
(EDR3) and current dark matter and astrophysical black hole population models to create mock DR4
catalogs containing stellar trajectories perturbed by lensing. Our analysis of these mock catalogs
suggests that Gaia DR4 will contain about 4 astrometric lensing events from astrophysical
black holes at a 5σ significance level. Furthermore, we project that our data analysis
pipeline applied to Gaia DR4 will result in leading constraints on compact dark matter in
the mass range 1–103 M
⊙ down to a dark matter fraction of about one percent.
Subject
Astronomy and Astrophysics
Cited by
4 articles.
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