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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" 1649 laughin 11-Feb-16 16:34
Re: gravity waves "detected" 633 Susan Doris 11-Feb-16 17:44
Re: gravity waves "detected" 513 Sirius7237 11-Feb-16 18:30
Re: gravity waves "detected" 614 laughin 11-Feb-16 21:20
Re: gravity waves "detected" 534 JonnyMcA 12-Feb-16 14:23
Re: gravity waves "detected" 569 laughin 12-Feb-16 15:51
Re: gravity waves "detected" 417 JonnyMcA 12-Feb-16 16:31
Re: gravity waves "detected" 522 laughin 13-Feb-16 18:26
Re: gravity waves "detected" 564 JonnyMcA 13-Feb-16 18:41
Re: gravity waves "detected" 652 Me 15-Feb-16 15:57
Re: gravity waves "detected" 487 laughin 15-Feb-16 20:17
Re: gravity waves "detected" 526 carolb 13-Feb-16 21:53
Re: gravity waves "detected" 420 D-Archer 14-Feb-16 11:16
Re: gravity waves "detected" 442 carolb 14-Feb-16 14:54
Re: gravity waves "detected" 428 Sirius7237 14-Feb-16 20:08
Re: gravity waves "detected" 531 carolb 14-Feb-16 22:31
Re: gravity waves "detected" 554 Aine 15-Feb-16 16:20
Re: gravity waves "detected" 472 D-Archer 15-Feb-16 09:59
Re: gravity waves "detected" 457 JonnyMcA 12-Feb-16 14:31
Re: gravity waves "detected" 485 carolb 13-Feb-16 21:29
Re: gravity waves "detected" 401 laughin 14-Feb-16 15:19
Re: gravity waves "detected" 345 skakos 15-Feb-16 14:07
Re: gravity waves "detected" 434 Pete Vanderzwet 11-Feb-16 21:06
Re: gravity waves "detected" 553 JonnyMcA 12-Feb-16 14:38
Onto Dark Energy waves! 493 Eddie Larry 11-Feb-16 21:34
It took 100 years to discover what Einstein already knew 343 David L 12-Feb-16 12:50
Re: It took 100 years to discover what Einstein already knew 439 Spiros 12-Feb-16 17:09
Re: It took 100 years to discover what Einstein already knew 501 D-Archer 15-Feb-16 12:47
Re: It took 100 years to discover what Einstein already knew 510 Aine 15-Feb-16 16:15
Re: It took 100 years to discover what Einstein already knew 466 D-Archer 15-Feb-16 18:53
Re: It took 100 years to discover what Einstein already knew 484 laughin 15-Feb-16 20:39
Re: It took 100 years to discover what Einstein already knew 422 Aine 16-Feb-16 01:48
Re: gravity waves "detected" 544 dong 12-Feb-16 18:36
Re: gravity waves "detected" 542 laughin 13-Feb-16 03:26
Re: gravity waves "detected" 470 dong 16-Feb-16 07:41
Liego 458 laughin 15-Feb-16 04:17
Gravity Waves of Propaganda the Sequel 454 D-Archer 15-Feb-16 09:48
Re: gravity waves "detected" 546 skakos 15-Feb-16 12:58
Re: gravity waves "detected" 501 Aine 15-Feb-16 22:31
Re: gravity waves "detected" 374 carolb 16-Feb-16 00:57
Re: gravity waves "detected" 444 D-Archer 16-Feb-16 11:47
Re: gravity waves "detected" 596 carolb 16-Feb-16 12:32
Re: gravity waves "detected" 402 D-Archer 16-Feb-16 14:13
Re: gravity waves "detected" 413 carolb 16-Feb-16 14:42
Re: gravity waves "detected" 387 D-Archer 16-Feb-16 15:17
Re: gravity waves "detected" 525 carolb 16-Feb-16 16:27
Re: gravity waves "detected" 529 D-Archer 17-Feb-16 14:08
Really? 422 Sirfiroth 17-Feb-16 15:11
Re: Really? 530 JonnyMcA 17-Feb-16 15:32
Re: Really? 525 D-Archer 17-Feb-16 15:42
Re: gravity waves "detected" 517 carolb 17-Feb-16 18:05
mods! 471 D-Archer 18-Feb-16 11:13
Re: mods! 553 carolb 18-Feb-16 14:14
Re: mods! 559 D-Archer 18-Feb-16 16:02
Re: gravity waves "detected" 642 Sirfiroth 17-Feb-16 01:06
Re: gravity waves "detected" 451 Aine 17-Feb-16 14:48
Re: gravity waves "detected" 507 JonnyMcA 17-Feb-16 15:19
Re: gravity waves "detected" 388 Sirfiroth 17-Feb-16 15:39
Re: gravity waves "detected" 474 JonnyMcA 17-Feb-16 17:37
Re: gravity waves "detected" 549 Aine 17-Feb-16 18:49
Re: gravity waves "detected" 494 laughin 16-Feb-16 20:24
Re: gravity waves "detected" 339 D-Archer 17-Feb-16 16:23
Gravy Waves 661 D-Archer 20-Feb-16 11:39
Playing devil’s advocate on the discovery of gravitational waves 601 laughin 02-Mar-16 18:23
Scientists: we're 100% convinced 434 laughin 07-Mar-16 17:13
Black holes and big bangs can't co-exist 523 laughin 13-Mar-16 04:52
Re: gravity waves "detected" 467 Observer 20-Apr-16 23:42
Re: gravity waves "detected" 467 laughin 21-Apr-16 14:02
Re: gravity waves "detected" 384 OCaptain 10-May-16 12:45
Re: gravity waves "detected" 380 laughin 10-May-16 13:16
Re: gravity waves "detected" 404 OCaptain 10-May-16 13:21
Re: gravity waves "detected" 454 laughin 10-May-16 19:25
Re: gravity waves "detected" 567 OCaptain 10-May-16 22:56
Re: gravity waves "detected" 473 laughin 11-May-16 15:32
Re: gravity waves "detected" 586 JonnyMcA 11-May-16 16:53
Re: gravity waves "detected" 567 laughin 12-May-16 16:26
pompousness "detected" 503 laughin 18-May-16 15:25
bump- 2 weeks 602 laughin 27-May-16 15:02
Re: bump- 3 weeks 546 laughin 02-Jun-16 23:20
Re: bump- 4 weeks and why isn't Carolb patrolling the threads 528 laughin 10-Jun-16 15:42
Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 507 laughin 04-May-16 13:15
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 521 D-Archer 09-May-16 19:05
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 346 OCaptain 10-May-16 12:46
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 554 laughin 10-May-16 13:27
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 394 OCaptain 10-May-16 16:39
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 452 laughin 10-May-16 19:10
how many times can you change the rules and still get a black hole 440 laughin 08-Jun-16 14:00
LIGO press conf, June 15 478 Observer 15-Jun-16 11:53
Re: LIGO press conf, June 15 461 D-Archer 15-Jun-16 14:48


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