File:Fermi Gamma-ray Space Telescope 3 years of observations (energies larger than 1 GeV).jpg

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File:Fermi Gamma-ray Space Telescope 3 years of observations (energies larger than 1 GeV).jpg - Wikipedia

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Description

After more than three years in space, NASA's Fermi Gamma-ray Space Telescope is extending its view of the high-energy sky into a range that to date has been largely unexplored territory. Now, the Fermi team has presented its first "head count" of sources in this new realm.

Fermi's Large Area Telescope (LAT) scans the entire sky every three hours, continually deepening its portrait of the sky in gamma rays, the most extreme form of light. While the energy of visible light falls between about 2 and 3 electron volts, the LAT detects gamma rays with energies ranging from 20 million electron volts (MeV) to more than 300 billion (GeV).

But at higher energies, gamma rays are few and far between. Above 10 GeV, even Fermi's LAT detects only one gamma ray every four months from some sources. The LAT's predecessor, the EGRET instrument on NASA's Compton Gamma Ray Observatory, detected only 1,500 individual gamma rays in this range during its nine-year lifetime, while the LAT detected more than 150,000 in just three years.

Any object producing gamma rays at these energies is undergoing extraordinary astrophysical processes. More than half of the 496 sources in the new census are active galaxies, where matter falling into a supermassive black hole powers jets that spray out particles at nearly the speed of light.

Fermi's view of the gamma-ray sky continually improves. This image of the entire sky includes three years of observations by Fermi's Large Area Telescope (LAT). It shows how the sky appears at energies greater than 1 billion electron volts (1 GeV). Brighter colors indicate brighter gamma-ray sources. A diffuse glow fills the sky and is brightest along the plane of our galaxy (middle). Discrete gamma-ray sources include pulsars and supernova remnants within our galaxy as well as distant galaxies powered by supermassive black holes.

Date

6 January 2012

Source

http://svs.gsfc.nasa.gov/goto?10887 (original TIFF image)

Author

NASA/DOE/Fermi LAT Collaboration

Permission
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	Date/Time	Thumbnail	Dimensions	User	Comment
current	21:51, 11 July 2012		6,973 × 4,000 (12.52 MB)	Prof. Professorson	{{Information \|Description=After more than three years in space, NASA's Fermi Gamma-ray Space Telescope is extending its view of the high-energy sky into a range that to date has been largely unexplored territory...

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Gamma-ray astronomy

Global file usage

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Usage on el.wikipedia.org
- Αστρονομία ακτίνων γ
Usage on fa.teknopedia.teknokrat.ac.id
- اخترشناسی پرتو گاما
Usage on it.teknopedia.teknokrat.ac.id
- Astronomia a raggi gamma
- Utente:CamillaP96/Sandbox
Usage on ko.wikipedia.org
- 감마선 천문학
Usage on ms.wikipedia.org
- Astronomi sinar gama
Usage on nl.teknopedia.teknokrat.ac.id
- Gamma-astronomie
Usage on nn.wikipedia.org
- Gamma-astronomi
Usage on tr.wikipedia.org
- Gama ışını astronomisi

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Date and time of digitizing	14:39, 27 December 2011
File change date and time	04:39, 29 December 2011
Date metadata was last modified	04:39, 29 December 2011
Software used	Adobe Photoshop CS5 Windows
Unique ID of original document	xmp.did:136D73686631E111BF13B11511BF2ACC

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inception

6 January 2012

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