(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 rotations. The signal immediately following
the impact (from a recoil) helps reduce the ambiguity of the
objects' parameters. If information on the alignment of the rotations
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 |
|Prefix||Example||Survey/Catalog|| || |
|GW||GW170817||GW detection|| || |
black hole merger
direct collapse black hole (DCBH)
gravitational wave (GW)
neutron star merger