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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" 1433 laughin 11-Feb-16 16:34
Re: gravity waves "detected" 476 Susan Doris 11-Feb-16 17:44
Re: gravity waves "detected" 373 Sirius7237 11-Feb-16 18:30
Re: gravity waves "detected" 453 laughin 11-Feb-16 21:20
Re: gravity waves "detected" 372 JonnyMcA 12-Feb-16 14:23
Re: gravity waves "detected" 413 laughin 12-Feb-16 15:51
Re: gravity waves "detected" 263 JonnyMcA 12-Feb-16 16:31
Re: gravity waves "detected" 371 laughin 13-Feb-16 18:26
Re: gravity waves "detected" 423 JonnyMcA 13-Feb-16 18:41
Re: gravity waves "detected" 455 Me 15-Feb-16 15:57
Re: gravity waves "detected" 346 laughin 15-Feb-16 20:17
Re: gravity waves "detected" 383 carolb 13-Feb-16 21:53
Re: gravity waves "detected" 285 D-Archer 14-Feb-16 11:16
Re: gravity waves "detected" 312 carolb 14-Feb-16 14:54
Re: gravity waves "detected" 295 Sirius7237 14-Feb-16 20:08
Re: gravity waves "detected" 403 carolb 14-Feb-16 22:31
Re: gravity waves "detected" 405 Aine 15-Feb-16 16:20
Re: gravity waves "detected" 327 D-Archer 15-Feb-16 09:59
Re: gravity waves "detected" 312 JonnyMcA 12-Feb-16 14:31
Re: gravity waves "detected" 352 carolb 13-Feb-16 21:29
Re: gravity waves "detected" 279 laughin 14-Feb-16 15:19
Re: gravity waves "detected" 206 skakos 15-Feb-16 14:07
Re: gravity waves "detected" 302 Pete Vanderzwet 11-Feb-16 21:06
Re: gravity waves "detected" 416 JonnyMcA 12-Feb-16 14:38
Onto Dark Energy waves! 353 Eddie Larry 11-Feb-16 21:34
It took 100 years to discover what Einstein already knew 219 David L 12-Feb-16 12:50
Re: It took 100 years to discover what Einstein already knew 299 Spiros 12-Feb-16 17:09
Re: It took 100 years to discover what Einstein already knew 365 D-Archer 15-Feb-16 12:47
Re: It took 100 years to discover what Einstein already knew 374 Aine 15-Feb-16 16:15
Re: It took 100 years to discover what Einstein already knew 327 D-Archer 15-Feb-16 18:53
Re: It took 100 years to discover what Einstein already knew 349 laughin 15-Feb-16 20:39
Re: It took 100 years to discover what Einstein already knew 289 Aine 16-Feb-16 01:48
Re: gravity waves "detected" 405 dong 12-Feb-16 18:36
Re: gravity waves "detected" 386 laughin 13-Feb-16 03:26
Re: gravity waves "detected" 325 dong 16-Feb-16 07:41
Liego 331 laughin 15-Feb-16 04:17
Gravity Waves of Propaganda the Sequel 309 D-Archer 15-Feb-16 09:48
Re: gravity waves "detected" 410 skakos 15-Feb-16 12:58
Re: gravity waves "detected" 364 Aine 15-Feb-16 22:31
Re: gravity waves "detected" 225 carolb 16-Feb-16 00:57
Re: gravity waves "detected" 311 D-Archer 16-Feb-16 11:47
Re: gravity waves "detected" 408 carolb 16-Feb-16 12:32
Re: gravity waves "detected" 273 D-Archer 16-Feb-16 14:13
Re: gravity waves "detected" 279 carolb 16-Feb-16 14:42
Re: gravity waves "detected" 260 D-Archer 16-Feb-16 15:17
Re: gravity waves "detected" 349 carolb 16-Feb-16 16:27
Re: gravity waves "detected" 385 D-Archer 17-Feb-16 14:08
Really? 263 Sirfiroth 17-Feb-16 15:11
Re: Really? 383 JonnyMcA 17-Feb-16 15:32
Re: Really? 366 D-Archer 17-Feb-16 15:42
Re: gravity waves "detected" 393 carolb 17-Feb-16 18:05
mods! 326 D-Archer 18-Feb-16 11:13
Re: mods! 413 carolb 18-Feb-16 14:14
Re: mods! 389 D-Archer 18-Feb-16 16:02
Re: gravity waves "detected" 507 Sirfiroth 17-Feb-16 01:06
Re: gravity waves "detected" 327 Aine 17-Feb-16 14:48
Re: gravity waves "detected" 363 JonnyMcA 17-Feb-16 15:19
Re: gravity waves "detected" 254 Sirfiroth 17-Feb-16 15:39
Re: gravity waves "detected" 308 JonnyMcA 17-Feb-16 17:37
Re: gravity waves "detected" 403 Aine 17-Feb-16 18:49
Re: gravity waves "detected" 355 laughin 16-Feb-16 20:24
Re: gravity waves "detected" 204 D-Archer 17-Feb-16 16:23
Gravy Waves 500 D-Archer 20-Feb-16 11:39
Playing devil’s advocate on the discovery of gravitational waves 448 laughin 02-Mar-16 18:23
Scientists: we're 100% convinced 291 laughin 07-Mar-16 17:13
Black holes and big bangs can't co-exist 387 laughin 13-Mar-16 04:52
Re: gravity waves "detected" 315 brett z 20-Apr-16 23:42
Re: gravity waves "detected" 331 laughin 21-Apr-16 14:02
Re: gravity waves "detected" 246 OCaptain 10-May-16 12:45
Re: gravity waves "detected" 187 laughin 10-May-16 13:16
Re: gravity waves "detected" 262 OCaptain 10-May-16 13:21
Re: gravity waves "detected" 304 laughin 10-May-16 19:25
Re: gravity waves "detected" 438 OCaptain 10-May-16 22:56
Re: gravity waves "detected" 315 laughin 11-May-16 15:32
Re: gravity waves "detected" 395 JonnyMcA 11-May-16 16:53
Re: gravity waves "detected" 421 laughin 12-May-16 16:26
pompousness "detected" 357 laughin 18-May-16 15:25
bump- 2 weeks 458 laughin 27-May-16 15:02
Re: bump- 3 weeks 393 laughin 02-Jun-16 23:20
Re: bump- 4 weeks and why isn't Carolb patrolling the threads 407 laughin 10-Jun-16 15:42
Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 367 laughin 04-May-16 13:15
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 403 D-Archer 09-May-16 19:05
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 194 OCaptain 10-May-16 12:46
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 422 laughin 10-May-16 13:27
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 254 OCaptain 10-May-16 16:39
Re: Gravitational Waves from Black Hole Megamergers Are Weaker Than Predicted 324 laughin 10-May-16 19:10
how many times can you change the rules and still get a black hole 306 laughin 08-Jun-16 14:00
LIGO press conf, June 15 332 brett z 15-Jun-16 11:53
Re: LIGO press conf, June 15 334 D-Archer 15-Jun-16 14:48


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