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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" 1603 laughin 11-Feb-16 16:34
Re: gravity waves "detected" 597 Susan Doris 11-Feb-16 17:44
Re: gravity waves "detected" 485 Sirius7237 11-Feb-16 18:30
Re: gravity waves "detected" 586 laughin 11-Feb-16 21:20
Re: gravity waves "detected" 508 JonnyMcA 12-Feb-16 14:23
Re: gravity waves "detected" 543 laughin 12-Feb-16 15:51
Re: gravity waves "detected" 389 JonnyMcA 12-Feb-16 16:31
Re: gravity waves "detected" 495 laughin 13-Feb-16 18:26
Re: gravity waves "detected" 540 JonnyMcA 13-Feb-16 18:41
Re: gravity waves "detected" 615 Me 15-Feb-16 15:57
Re: gravity waves "detected" 456 laughin 15-Feb-16 20:17
Re: gravity waves "detected" 501 carolb 13-Feb-16 21:53
Re: gravity waves "detected" 394 D-Archer 14-Feb-16 11:16
Re: gravity waves "detected" 411 carolb 14-Feb-16 14:54
Re: gravity waves "detected" 407 Sirius7237 14-Feb-16 20:08
Re: gravity waves "detected" 507 carolb 14-Feb-16 22:31
Re: gravity waves "detected" 527 Aine 15-Feb-16 16:20
Re: gravity waves "detected" 445 D-Archer 15-Feb-16 09:59
Re: gravity waves "detected" 428 JonnyMcA 12-Feb-16 14:31
Re: gravity waves "detected" 461 carolb 13-Feb-16 21:29
Re: gravity waves "detected" 376 laughin 14-Feb-16 15:19
Re: gravity waves "detected" 318 skakos 15-Feb-16 14:07
Re: gravity waves "detected" 408 Pete Vanderzwet 11-Feb-16 21:06
Re: gravity waves "detected" 527 JonnyMcA 12-Feb-16 14:38
Onto Dark Energy waves! 465 Eddie Larry 11-Feb-16 21:34
It took 100 years to discover what Einstein already knew 321 David L 12-Feb-16 12:50
Re: It took 100 years to discover what Einstein already knew 414 Spiros 12-Feb-16 17:09
Re: It took 100 years to discover what Einstein already knew 473 D-Archer 15-Feb-16 12:47
Re: It took 100 years to discover what Einstein already knew 485 Aine 15-Feb-16 16:15
Re: It took 100 years to discover what Einstein already knew 439 D-Archer 15-Feb-16 18:53
Re: It took 100 years to discover what Einstein already knew 457 laughin 15-Feb-16 20:39
Re: It took 100 years to discover what Einstein already knew 397 Aine 16-Feb-16 01:48
Re: gravity waves "detected" 521 dong 12-Feb-16 18:36
Re: gravity waves "detected" 517 laughin 13-Feb-16 03:26
Re: gravity waves "detected" 442 dong 16-Feb-16 07:41
Liego 432 laughin 15-Feb-16 04:17
Gravity Waves of Propaganda the Sequel 428 D-Archer 15-Feb-16 09:48
Re: gravity waves "detected" 517 skakos 15-Feb-16 12:58
Re: gravity waves "detected" 477 Aine 15-Feb-16 22:31
Re: gravity waves "detected" 346 carolb 16-Feb-16 00:57
Re: gravity waves "detected" 422 D-Archer 16-Feb-16 11:47
Re: gravity waves "detected" 568 carolb 16-Feb-16 12:32
Re: gravity waves "detected" 377 D-Archer 16-Feb-16 14:13
Re: gravity waves "detected" 389 carolb 16-Feb-16 14:42
Re: gravity waves "detected" 361 D-Archer 16-Feb-16 15:17
Re: gravity waves "detected" 496 carolb 16-Feb-16 16:27
Re: gravity waves "detected" 506 D-Archer 17-Feb-16 14:08
Really? 394 Sirfiroth 17-Feb-16 15:11
Re: Really? 503 JonnyMcA 17-Feb-16 15:32
Re: Really? 492 D-Archer 17-Feb-16 15:42
Re: gravity waves "detected" 492 carolb 17-Feb-16 18:05
mods! 444 D-Archer 18-Feb-16 11:13
Re: mods! 528 carolb 18-Feb-16 14:14
Re: mods! 532 D-Archer 18-Feb-16 16:02
Re: gravity waves "detected" 610 Sirfiroth 17-Feb-16 01:06
Re: gravity waves "detected" 426 Aine 17-Feb-16 14:48
Re: gravity waves "detected" 476 JonnyMcA 17-Feb-16 15:19
Re: gravity waves "detected" 358 Sirfiroth 17-Feb-16 15:39
Re: gravity waves "detected" 446 JonnyMcA 17-Feb-16 17:37
Re: gravity waves "detected" 525 Aine 17-Feb-16 18:49
Re: gravity waves "detected" 466 laughin 16-Feb-16 20:24
Re: gravity waves "detected" 312 D-Archer 17-Feb-16 16:23
Gravy Waves 634 D-Archer 20-Feb-16 11:39
Playing devil’s advocate on the discovery of gravitational waves 579 laughin 02-Mar-16 18:23
Scientists: we're 100% convinced 404 laughin 07-Mar-16 17:13
Black holes and big bangs can't co-exist 498 laughin 13-Mar-16 04:52
Re: gravity waves "detected" 438 Observer 20-Apr-16 23:42
Re: gravity waves "detected" 446 laughin 21-Apr-16 14:02
Re: gravity waves "detected" 362 OCaptain 10-May-16 12:45
Re: gravity waves "detected" 356 laughin 10-May-16 13:16
Re: gravity waves "detected" 379 OCaptain 10-May-16 13:21
Re: gravity waves "detected" 430 laughin 10-May-16 19:25
Re: gravity waves "detected" 542 OCaptain 10-May-16 22:56
Re: gravity waves "detected" 445 laughin 11-May-16 15:32
Re: gravity waves "detected" 548 JonnyMcA 11-May-16 16:53
Re: gravity waves "detected" 542 laughin 12-May-16 16:26
pompousness "detected" 480 laughin 18-May-16 15:25
bump- 2 weeks 578 laughin 27-May-16 15:02
Re: bump- 3 weeks 523 laughin 02-Jun-16 23:20
Re: bump- 4 weeks and why isn't Carolb patrolling the threads 506 laughin 10-Jun-16 15:42
Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 484 laughin 04-May-16 13:15
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 497 D-Archer 09-May-16 19:05
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 320 OCaptain 10-May-16 12:46
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 527 laughin 10-May-16 13:27
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 367 OCaptain 10-May-16 16:39
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 425 laughin 10-May-16 19:10
how many times can you change the rules and still get a black hole 415 laughin 08-Jun-16 14:00
LIGO press conf, June 15 455 Observer 15-Jun-16 11:53
Re: LIGO press conf, June 15 440 D-Archer 15-Jun-16 14:48


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