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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" 1550 laughin 11-Feb-16 16:34
Re: gravity waves "detected" 561 Susan Doris 11-Feb-16 17:44
Re: gravity waves "detected" 451 Sirius7237 11-Feb-16 18:30
Re: gravity waves "detected" 554 laughin 11-Feb-16 21:20
Re: gravity waves "detected" 470 JonnyMcA 12-Feb-16 14:23
Re: gravity waves "detected" 510 laughin 12-Feb-16 15:51
Re: gravity waves "detected" 355 JonnyMcA 12-Feb-16 16:31
Re: gravity waves "detected" 458 laughin 13-Feb-16 18:26
Re: gravity waves "detected" 508 JonnyMcA 13-Feb-16 18:41
Re: gravity waves "detected" 573 Me 15-Feb-16 15:57
Re: gravity waves "detected" 424 laughin 15-Feb-16 20:17
Re: gravity waves "detected" 461 carolb 13-Feb-16 21:53
Re: gravity waves "detected" 359 D-Archer 14-Feb-16 11:16
Re: gravity waves "detected" 375 carolb 14-Feb-16 14:54
Re: gravity waves "detected" 371 Sirius7237 14-Feb-16 20:08
Re: gravity waves "detected" 475 carolb 14-Feb-16 22:31
Re: gravity waves "detected" 487 Aine 15-Feb-16 16:20
Re: gravity waves "detected" 410 D-Archer 15-Feb-16 09:59
Re: gravity waves "detected" 388 JonnyMcA 12-Feb-16 14:31
Re: gravity waves "detected" 428 carolb 13-Feb-16 21:29
Re: gravity waves "detected" 339 laughin 14-Feb-16 15:19
Re: gravity waves "detected" 281 skakos 15-Feb-16 14:07
Re: gravity waves "detected" 374 Pete Vanderzwet 11-Feb-16 21:06
Re: gravity waves "detected" 493 JonnyMcA 12-Feb-16 14:38
Onto Dark Energy waves! 435 Eddie Larry 11-Feb-16 21:34
It took 100 years to discover what Einstein already knew 290 David L 12-Feb-16 12:50
Re: It took 100 years to discover what Einstein already knew 378 Spiros 12-Feb-16 17:09
Re: It took 100 years to discover what Einstein already knew 443 D-Archer 15-Feb-16 12:47
Re: It took 100 years to discover what Einstein already knew 452 Aine 15-Feb-16 16:15
Re: It took 100 years to discover what Einstein already knew 404 D-Archer 15-Feb-16 18:53
Re: It took 100 years to discover what Einstein already knew 424 laughin 15-Feb-16 20:39
Re: It took 100 years to discover what Einstein already knew 364 Aine 16-Feb-16 01:48
Re: gravity waves "detected" 493 dong 12-Feb-16 18:36
Re: gravity waves "detected" 487 laughin 13-Feb-16 03:26
Re: gravity waves "detected" 407 dong 16-Feb-16 07:41
Liego 401 laughin 15-Feb-16 04:17
Gravity Waves of Propaganda the Sequel 394 D-Archer 15-Feb-16 09:48
Re: gravity waves "detected" 475 skakos 15-Feb-16 12:58
Re: gravity waves "detected" 441 Aine 15-Feb-16 22:31
Re: gravity waves "detected" 312 carolb 16-Feb-16 00:57
Re: gravity waves "detected" 392 D-Archer 16-Feb-16 11:47
Re: gravity waves "detected" 528 carolb 16-Feb-16 12:32
Re: gravity waves "detected" 345 D-Archer 16-Feb-16 14:13
Re: gravity waves "detected" 360 carolb 16-Feb-16 14:42
Re: gravity waves "detected" 333 D-Archer 16-Feb-16 15:17
Re: gravity waves "detected" 461 carolb 16-Feb-16 16:27
Re: gravity waves "detected" 469 D-Archer 17-Feb-16 14:08
Really? 363 Sirfiroth 17-Feb-16 15:11
Re: Really? 468 JonnyMcA 17-Feb-16 15:32
Re: Really? 457 D-Archer 17-Feb-16 15:42
Re: gravity waves "detected" 458 carolb 17-Feb-16 18:05
mods! 413 D-Archer 18-Feb-16 11:13
Re: mods! 495 carolb 18-Feb-16 14:14
Re: mods! 494 D-Archer 18-Feb-16 16:02
Re: gravity waves "detected" 572 Sirfiroth 17-Feb-16 01:06
Re: gravity waves "detected" 392 Aine 17-Feb-16 14:48
Re: gravity waves "detected" 436 JonnyMcA 17-Feb-16 15:19
Re: gravity waves "detected" 325 Sirfiroth 17-Feb-16 15:39
Re: gravity waves "detected" 400 JonnyMcA 17-Feb-16 17:37
Re: gravity waves "detected" 487 Aine 17-Feb-16 18:49
Re: gravity waves "detected" 435 laughin 16-Feb-16 20:24
Re: gravity waves "detected" 282 D-Archer 17-Feb-16 16:23
Gravy Waves 597 D-Archer 20-Feb-16 11:39
Playing devil’s advocate on the discovery of gravitational waves 543 laughin 02-Mar-16 18:23
Scientists: we're 100% convinced 368 laughin 07-Mar-16 17:13
Black holes and big bangs can't co-exist 467 laughin 13-Mar-16 04:52
Re: gravity waves "detected" 404 brett z 20-Apr-16 23:42
Re: gravity waves "detected" 413 laughin 21-Apr-16 14:02
Re: gravity waves "detected" 328 OCaptain 10-May-16 12:45
Re: gravity waves "detected" 293 laughin 10-May-16 13:16
Re: gravity waves "detected" 349 OCaptain 10-May-16 13:21
Re: gravity waves "detected" 394 laughin 10-May-16 19:25
Re: gravity waves "detected" 507 OCaptain 10-May-16 22:56
Re: gravity waves "detected" 408 laughin 11-May-16 15:32
Re: gravity waves "detected" 505 JonnyMcA 11-May-16 16:53
Re: gravity waves "detected" 504 laughin 12-May-16 16:26
pompousness "detected" 444 laughin 18-May-16 15:25
bump- 2 weeks 545 laughin 27-May-16 15:02
Re: bump- 3 weeks 482 laughin 02-Jun-16 23:20
Re: bump- 4 weeks and why isn't Carolb patrolling the threads 475 laughin 10-Jun-16 15:42
Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 459 laughin 04-May-16 13:15
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 466 D-Archer 09-May-16 19:05
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 284 OCaptain 10-May-16 12:46
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 495 laughin 10-May-16 13:27
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 336 OCaptain 10-May-16 16:39
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 389 laughin 10-May-16 19:10
how many times can you change the rules and still get a black hole 384 laughin 08-Jun-16 14:00
LIGO press conf, June 15 424 brett z 15-Jun-16 11:53
Re: LIGO press conf, June 15 409 D-Archer 15-Jun-16 14:48


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