| Abstract: | We report on gravitational wave discoveries from compact binary coalescences
detected by Advanced LIGO and Advanced Virgo between 1 April 2019 15:00 UTC and
1 October 2019 15:00. By imposing a false-alarm-rate threshold of two per year
in each of the four search pipelines that constitute our search, we present 39
candidate gravitational wave events. At this threshold, we expect a
contamination fraction of less than 10%. Of these, 26 candidate events were
reported previously in near real-time through GCN Notices and Circulars; 13 are
reported here for the first time. The catalog contains events whose sources are
black hole binary mergers up to a redshift of ~0.8, as well as events which
could plausibly originate from binary neutron stars, neutron star-black hole
binaries, or binary black holes. For the latter group, we are unable to
determine the nature based on estimates of the component masses and spins from
gravitational wave data alone. The range of candidate events which are
unambiguously identified as binary black holes (both objects $geq 3~M_odot$)
is increased compared to GWTC-1, with total masses from $sim 14~M_odot$ for
GW190924_021846 to $sim 150~M_odot$ for GW190521. For the first time, this
catalog includes binary systems with asymmetric mass ratios, which had not been
observed in data taken before April 2019. Given the increased sensitivity of
Advanced LIGO and Advanced Virgo, the detection of 39 candidate events in ~26
weeks of data (~1.5 per week) is consistent with GWTC-1. |
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