Astrophysics (index)about

GW detection

(GW, gravitational wave detection)
(observed gravitational wave signal recognizable as an astronomical event)

A GW detection (gravitational wave detection) is the event of a gravitational wave pattern received that is recognizable as the signal of an astronomical event (a gravitational wave event or GW event). Detections so far have been of black hole mergers except for one neutron star merger. These were recognized as a target for detection and the process has been analyzed as to the signal they would produce, and the detections confirm current science of black holes and neutron stars as well as the general relativity model of gravity.

The merger signals reveal information analytically (e.g., the chirp mass), and more through numerical simulation of objects of various sizes and spins. The signal immediately following the impact (from a recoil) helps reduce the ambiguity of the objects' parameters. If information on the alignment of the spins can be deduced, that would provide evidence whether the two objects were born as a binary star versus some sort of capture.

There have been six detections through 2018:

GWyymmdd what merged detector(s)
GW150914 black holes LIGO first detection
GW151226 black holes LIGO
GW170104 black holes LIGO
GW170608 black holes LIGO
GW170814 black holes LIGO/Virgo
GW170817 neutron stars LIGO/Virgo location and source spotted

(gravity,transient type)
GWGW170817GW detection 

Referenced by:
black hole merger
gravitational wave (GW)
neutron star merger