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Re: [Phys-L] additional gravitational wave signals



Thanks to John Denker for sending this. Haven't seen any mention yet in the popular media. It's great to see experimental confirmation of the first reporting and to start getting an (approximate) experimental estimate of the frequency of such events.

Don

Dr. Donald Polvani
Part Time Faculty, Physics (Retired)
Anne Arundel Community College
Arnold, MD 21012

-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@www.phys-l.org] On Behalf Of John
Denker
Sent: Wednesday, June 15, 2016 4:38 PM
To: Forum for Physics Educators <Phys-L@Phys-L.org>; Sharing resources for
high school physics <PHYSHARE@lists.psu.edu>
Subject: [Phys-L] additional gravitatonal wave signals

This has been rumored for a while, but has finally passed all checks and been
promoted to an official result:

LIGO Does It Again: A Second Robust Binary Black Hole Coalescence
Observed

News Release • June 15, 2016

The two LIGO gravitational wave detectors in Hanford Washington and
Livingston Louisiana have caught a second robust signal from two black
holes in their final orbits and then their coalescence into a single
black hole. This event was seen on December 26th at 03:38:53 UTC.

Like LIGO's first detection, this event was identified within minutes
of the gravitational wave's passing. The Boxing Day event differed
from the LIGO's first gravitational wave observation in some important
ways, however.

[and so on]
https://www.ligo.caltech.edu/news/ligo20160615

https://www.ligo.caltech.edu/system/media_files/binaries/336/original/pre
ss-release.pdf

See also the draft of a scholarly paper:
"Binary Black Hole Mergers in the first Advanced LIGO Observing Run"
https://dcc.ligo.org/public/0124/P1600088/015/bbh-o1.pdf
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