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| From | jimp@specsol.spam.sux.com |
|---|---|
| Newsgroups | sci.physics |
| Subject | Re: Fermi mission finds hints of gamma-ray cycle in an active galaxy |
| Date | 2015-11-14 19:10 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <bidkhc-ih4.ln1@mail.specsol.com> (permalink) |
| References | <D6ydnQW3fKkKzNrLnZ2dnUU7-X-dnZ2d@giganews.com> |
Sam Wormley <swormley1@gmail.com> wrote: > Fermi mission finds hints of gamma-ray cycle in an active galaxy >> http://phys.org/news/2015-11-fermi-mission-hints-gamma-ray-galaxy.html >> http://cdn.phys.org/newman/csz/news/800/2015/fermimission.jpg > > >> Astronomers using data from NASA's Fermi Gamma-ray Space Telescope >> have detected hints of periodic changes in the brightness of a >> so-called "active" galaxy, whose emissions are powered by a >> supersized black hole. If confirmed, the discovery would mark the >> first years-long cyclic gamma-ray emission ever detected from any >> galaxy, which could provide new insights into physical processes near >> the black hole. >> >> "Looking at many years of data from Fermi's Large Area Telescope >> (LAT), we picked up indications of a roughly two-year-long variation >> of gamma rays from a galaxy known as PG 1553+113," said Stefano >> Ciprini, who coordinates the Fermi team at the Italian Space Agency's >> Science Data Center (ASDC) in Rome. "This signal is subtle and has >> been seen over less than four cycles, so while this is tantalizing we >> need more observations." >> >> Supermassive black holes weighing millions of times the sun's mass >> lie at the hearts of most large galaxies, including our own Milky >> Way. In about 1 percent of these galaxies, the monster black hole >> radiates billions of times as much energy as the sun, emission that >> can vary unpredictably on timescales ranging from minutes to years. >> Astronomers refer to these as active galaxies. >> >> More than half of the gamma-ray sources seen by Fermi's LAT are >> active galaxies called blazars, like PG 1553+113. As matter falls >> toward its supermassive black hole, some subatomic particles escape >> at nearly the speed of light along a pair of jets pointed in opposite >> directions. What makes a blazar so bright is that one of these >> particle jets happens to be aimed almost directly toward us. Yet another cut and paste about hints... -- Jim Pennino
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Fermi mission finds hints of gamma-ray cycle in an active galaxy Sam Wormley <swormley1@gmail.com> - 2015-11-14 09:21 -0600
Re: Fermi mission finds hints of gamma-ray cycle in an active galaxy jimp@specsol.spam.sux.com - 2015-11-14 19:10 +0000
Re: Fermi mission finds hints of gamma-ray cycle in an active galaxy "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-14 13:32 -0800
Re: Fermi mission finds hints of gamma-ray cycle in an active galaxy "hanson" <hanson@quick.net> - 2015-11-14 14:09 -0800
Re: Fermi mission finds hints of gamma-ray cycle in an active galaxy "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-16 16:24 -0800
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