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Quote

First black-hole signals
James Hough from the University of Glasgow in the UK agrees with Stuver, pointing out that LIGO’s discovery is also the only direct evidence we have for the existence of any black holes. Astronomers had previously obtained only indirect evidence in the form of X-rays from matter falling into other black holes and the distortion of the orbits of stars at galactic centres that host supermassive black holes.
Hough says the team can be sure that the waves in the GW150914 event came from two merging stellar-mass black holes because the waves are directly related to the size of the system. The radius of the objects is such that they must be black holes for the mass that they have, he explains. “I think that there is no doubt about that at all.”
He adds that the signal from GW150914 was so perfect and clear that it almost needed no sophisticated data analysis to tease it out of LIGO’s data. The signal lasted in the detector for nearly 0.2 s, sweeping from about 30 Hz to 150 Hz, almost exactly as was expected for such a wave.
Matching the templates
According to Stuver, LIGO has a large “template bank” containing detailed simulations and predictions for every possible type of merger – be it binary black holes or neutron stars – with many different permutations and combinations of possible masses. Each template produces a unique gravitational-wave signal and the researchers’ computer system actively looks for a high correlation between it and an incoming signal. If the two are close, a detection is flagged. For GW150914, this correlation was extremely clear and immediately noticeable.

now having experience dealing with big science -global warming
this should , at least, make one stop and say "wait a minute"

a event that happened a billion years ago
just so happened to float by right after
LIGO was "upgraded"...........
a few days earlier and we'd a missed it
and some thought "coincidences" only happened on GT&P

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Subject Views Written By Posted
gravity waves "detected" 1563 laughin 11-Feb-16 16:34
Re: gravity waves "detected" 572 Susan Doris 11-Feb-16 17:44
Re: gravity waves "detected" 460 Sirius7237 11-Feb-16 18:30
Re: gravity waves "detected" 563 laughin 11-Feb-16 21:20
Re: gravity waves "detected" 480 JonnyMcA 12-Feb-16 14:23
Re: gravity waves "detected" 520 laughin 12-Feb-16 15:51
Re: gravity waves "detected" 363 JonnyMcA 12-Feb-16 16:31
Re: gravity waves "detected" 468 laughin 13-Feb-16 18:26
Re: gravity waves "detected" 519 JonnyMcA 13-Feb-16 18:41
Re: gravity waves "detected" 583 Me 15-Feb-16 15:57
Re: gravity waves "detected" 436 laughin 15-Feb-16 20:17
Re: gravity waves "detected" 476 carolb 13-Feb-16 21:53
Re: gravity waves "detected" 369 D-Archer 14-Feb-16 11:16
Re: gravity waves "detected" 384 carolb 14-Feb-16 14:54
Re: gravity waves "detected" 383 Sirius7237 14-Feb-16 20:08
Re: gravity waves "detected" 484 carolb 14-Feb-16 22:31
Re: gravity waves "detected" 498 Aine 15-Feb-16 16:20
Re: gravity waves "detected" 420 D-Archer 15-Feb-16 09:59
Re: gravity waves "detected" 397 JonnyMcA 12-Feb-16 14:31
Re: gravity waves "detected" 438 carolb 13-Feb-16 21:29
Re: gravity waves "detected" 349 laughin 14-Feb-16 15:19
Re: gravity waves "detected" 292 skakos 15-Feb-16 14:07
Re: gravity waves "detected" 382 Pete Vanderzwet 11-Feb-16 21:06
Re: gravity waves "detected" 505 JonnyMcA 12-Feb-16 14:38
Onto Dark Energy waves! 442 Eddie Larry 11-Feb-16 21:34
It took 100 years to discover what Einstein already knew 297 David L 12-Feb-16 12:50
Re: It took 100 years to discover what Einstein already knew 387 Spiros 12-Feb-16 17:09
Re: It took 100 years to discover what Einstein already knew 453 D-Archer 15-Feb-16 12:47
Re: It took 100 years to discover what Einstein already knew 462 Aine 15-Feb-16 16:15
Re: It took 100 years to discover what Einstein already knew 414 D-Archer 15-Feb-16 18:53
Re: It took 100 years to discover what Einstein already knew 434 laughin 15-Feb-16 20:39
Re: It took 100 years to discover what Einstein already knew 374 Aine 16-Feb-16 01:48
Re: gravity waves "detected" 501 dong 12-Feb-16 18:36
Re: gravity waves "detected" 495 laughin 13-Feb-16 03:26
Re: gravity waves "detected" 416 dong 16-Feb-16 07:41
Liego 412 laughin 15-Feb-16 04:17
Gravity Waves of Propaganda the Sequel 405 D-Archer 15-Feb-16 09:48
Re: gravity waves "detected" 488 skakos 15-Feb-16 12:58
Re: gravity waves "detected" 452 Aine 15-Feb-16 22:31
Re: gravity waves "detected" 322 carolb 16-Feb-16 00:57
Re: gravity waves "detected" 400 D-Archer 16-Feb-16 11:47
Re: gravity waves "detected" 538 carolb 16-Feb-16 12:32
Re: gravity waves "detected" 353 D-Archer 16-Feb-16 14:13
Re: gravity waves "detected" 368 carolb 16-Feb-16 14:42
Re: gravity waves "detected" 340 D-Archer 16-Feb-16 15:17
Re: gravity waves "detected" 471 carolb 16-Feb-16 16:27
Re: gravity waves "detected" 480 D-Archer 17-Feb-16 14:08
Really? 370 Sirfiroth 17-Feb-16 15:11
Re: Really? 478 JonnyMcA 17-Feb-16 15:32
Re: Really? 468 D-Archer 17-Feb-16 15:42
Re: gravity waves "detected" 469 carolb 17-Feb-16 18:05
mods! 422 D-Archer 18-Feb-16 11:13
Re: mods! 506 carolb 18-Feb-16 14:14
Re: mods! 504 D-Archer 18-Feb-16 16:02
Re: gravity waves "detected" 583 Sirfiroth 17-Feb-16 01:06
Re: gravity waves "detected" 403 Aine 17-Feb-16 14:48
Re: gravity waves "detected" 446 JonnyMcA 17-Feb-16 15:19
Re: gravity waves "detected" 334 Sirfiroth 17-Feb-16 15:39
Re: gravity waves "detected" 411 JonnyMcA 17-Feb-16 17:37
Re: gravity waves "detected" 498 Aine 17-Feb-16 18:49
Re: gravity waves "detected" 443 laughin 16-Feb-16 20:24
Re: gravity waves "detected" 291 D-Archer 17-Feb-16 16:23
Gravy Waves 609 D-Archer 20-Feb-16 11:39
Playing devil’s advocate on the discovery of gravitational waves 552 laughin 02-Mar-16 18:23
Scientists: we're 100% convinced 375 laughin 07-Mar-16 17:13
Black holes and big bangs can't co-exist 476 laughin 13-Mar-16 04:52
Re: gravity waves "detected" 414 brett z 20-Apr-16 23:42
Re: gravity waves "detected" 422 laughin 21-Apr-16 14:02
Re: gravity waves "detected" 339 OCaptain 10-May-16 12:45
Re: gravity waves "detected" 320 laughin 10-May-16 13:16
Re: gravity waves "detected" 357 OCaptain 10-May-16 13:21
Re: gravity waves "detected" 404 laughin 10-May-16 19:25
Re: gravity waves "detected" 517 OCaptain 10-May-16 22:56
Re: gravity waves "detected" 415 laughin 11-May-16 15:32
Re: gravity waves "detected" 514 JonnyMcA 11-May-16 16:53
Re: gravity waves "detected" 517 laughin 12-May-16 16:26
pompousness "detected" 454 laughin 18-May-16 15:25
bump- 2 weeks 556 laughin 27-May-16 15:02
Re: bump- 3 weeks 495 laughin 02-Jun-16 23:20
Re: bump- 4 weeks and why isn't Carolb patrolling the threads 484 laughin 10-Jun-16 15:42
Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 466 laughin 04-May-16 13:15
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 476 D-Archer 09-May-16 19:05
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 292 OCaptain 10-May-16 12:46
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 506 laughin 10-May-16 13:27
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 344 OCaptain 10-May-16 16:39
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 399 laughin 10-May-16 19:10
how many times can you change the rules and still get a black hole 394 laughin 08-Jun-16 14:00
LIGO press conf, June 15 432 brett z 15-Jun-16 11:53
Re: LIGO press conf, June 15 418 D-Archer 15-Jun-16 14:48


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