Prima detecţie confirmată a undelor gravitaţionale
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Prima detecţie confirmată a undelor gravitaţionale
Scris de Rami Joi Feb 11, 2016 8:02 pm
Abstractul publicat în PHYSICAL REVIEW LETTERS, 11 feb. 2016:
"On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with a peak gravitational-wave strain of 1.0×10−21. It matches the waveform predicted by general relativity for the inspiral and merger of a pair of black holes and the ringdown of the resulting single black hole. The signal was observed with a matched-filter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203 000 years, equivalent to a significance greater than 5.1σ. The source lies at a luminosity distance of 410+160−180 Mpc corresponding to a redshift z=0.09+0.03−0.04. In the source frame, the initial black hole masses are 36+5−4M⊙ and 29+4−4M⊙, and the final black hole mass is 62+4−4M⊙, with 3.0+0.5−0.5M⊙c2 radiated in gravitational waves. All uncertainties define 90% credible intervals. These observations demonstrate the existence of binary stellar-mass black hole systems. This is the first direct detection of gravitational waves and the first observation of a binary black hole merger."
Deci energia echivalentă a 3 mase solare a fost radiată sub formă de unde gravitaţionale! Wow!
"On September 14, 2015 at 09:50:45 UTC the two detectors of the Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with a peak gravitational-wave strain of 1.0×10−21. It matches the waveform predicted by general relativity for the inspiral and merger of a pair of black holes and the ringdown of the resulting single black hole. The signal was observed with a matched-filter signal-to-noise ratio of 24 and a false alarm rate estimated to be less than 1 event per 203 000 years, equivalent to a significance greater than 5.1σ. The source lies at a luminosity distance of 410+160−180 Mpc corresponding to a redshift z=0.09+0.03−0.04. In the source frame, the initial black hole masses are 36+5−4M⊙ and 29+4−4M⊙, and the final black hole mass is 62+4−4M⊙, with 3.0+0.5−0.5M⊙c2 radiated in gravitational waves. All uncertainties define 90% credible intervals. These observations demonstrate the existence of binary stellar-mass black hole systems. This is the first direct detection of gravitational waves and the first observation of a binary black hole merger."
Deci energia echivalentă a 3 mase solare a fost radiată sub formă de unde gravitaţionale! Wow!
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Re: Prima detecţie confirmată a undelor gravitaţionale
Scris de Rami Joi Feb 18, 2016 9:33 pm
Locaţia de provenienţă a semnalului înregistrat de LIGO:
http://www.ligo.org/news/pressreleases.php
Fermi GBM înregistrează o explozie de raze gamma cu o întârziere de 0,4 secunde de la evenimentul LIGO:
http://arxiv.org/abs/1602.03920
http://www.ligo.org/news/pressreleases.php
Fermi GBM înregistrează o explozie de raze gamma cu o întârziere de 0,4 secunde de la evenimentul LIGO:
http://arxiv.org/abs/1602.03920
Rami- Experienced User
- Mesaje : 498
Puncte : 648
Data de inscriere : 01/10/2012
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