When two black holes merge in a dense star cluster, they form a new black hole with a well-
defined mass and spin. If that “second-generation” black hole remains in the cluster, it will …

During the second observing run of the Laser Interferometer Gravitational-wave Observatory
(LIGO) and Virgo Interferometer, a gravitational-wave signal consistent with a binary neutron …

Both the mass and radius of the millisecond pulsar PSR J0030+ 0451 have been inferred
via pulse-profile modeling of X-ray data obtained by NASA's Neutron Star Interior …

A stochastic background of gravitational waves could be created by the superposition of a
large number of independent sources. The physical processes occurring at the earliest …

The merger of two massive (about 30 solar masses) black holes has been detected in
gravitational waves. This discovery validates recent predictions,, that massive binary black …

Gravitational-wave detectors are starting to reveal the redshift evolution of the binary black
hole (BBH) merger rate, R BBH (z). We make predictions for R BBH (z) as a function of black …

We present a comprehensive optical and near-infrared census of the fields of 90 short
gamma-ray bursts (GRBs) discovered in 2005–2021, constituting all short GRBs for which …

The collection of individually resolvable gravitational wave (GW) events makes up a tiny
fraction of all GW signals that reach our detectors, while most lie below the confusion limit …

KAGRA is a newly built gravitational-wave telescope, a laser interferometer comprising arms
with a length of 3 km, located in Kamioka, Gifu, Japan. KAGRA was constructed under the …

Gravitational-wave (GW) detections are starting to reveal features in the mass distribution of
double compact objects. The lower end of the black hole (BH) mass distribution is especially …