Fermi brings high energy sky map Sunday, March 15, 2009 Part 1 and 2

Fermi brings high energy sky map
Sunday, March 15, 2009



The Fermi Gamma-ray Space Telescope science has provided an unprecedented look at the high energy universe. Fermi scans every three hours the entire sky at gamma wavelengths, which allows astronomers to change high-energy sources are easy to detect. Now you 87 days to observations combined into a single sky map. This map shows how the universe would look like, if our eyes could absorb radiation that 150 million times more energetic than visible light.

The sky map shows many sources of gamma radiation, both within and outside our galaxy. These include super-massive black holes, pulsars, interacting binary stars and even entire clusters. The scientists have published an article in which the 205 brightest sources in the catalog of Fermi described. Fermi's team has it a "top ten" complex, which consists of five sources in the Milky Way and five sources outside the Milky Way.



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Part 2:

The top five range of sources in the galaxy are:

The Sunday sun Now the minimum of its activity cycle is achieved, the sun no significant source of gamma radiation should be, were it not that our mom's the only gamma source that moves across the sky. The annual movement of the sun across the sky is a reflection of the orbit of the earth around the Sunday

The Fermi gamma radiation which is in the sun, is from high-energy cosmic particles that collide with the gas and radiation from the Sunday The sun can only solar flares like a gamma source in itself. During the coming years, the activity of the sun rise again, leaving a growing number of solar flares will be produced. The most powerful solar flares produce gamma rays that only by Fermi (and no other instrument) can be observed.

LSI 61 303. This high-energy double system at a distance of 6500 light years away in the direction of the constellation Cassiopeia. This unusual system consisting of a hot class B star and a neutron star, which every 26.5 days, a powerful radio outburst generate. The exact origin of these eruptions are not known.

PSR J1836 5925. This is a pulsar (a rapidly rotating neutron star that beams of radiation emissions) in the direction of the constellation Draco. This pulsar is a new class of pulsars, whose existence is determined by Fermi. These pulsars emit beams of radiation only within the range of coverage - most pulsars are much more active wavelengths (such as X rays and radio waves).

47 Tucanae. Sterrenhoop This is a spherical, a spherical cluster of ancient stars. This cluster is at a distance of 15,000 light years and is also known as NGC 104. Presumably, the gamma radiation of 47 Tucanae from multiple individual sources within this press star populated city.

Unknown. Approximately 30 bright gamma sources Fermi has seen, have no obvious counterparts in other wavelengths. One of them, 0FGL J1813.5-1248 is no other mission than Fermi seen and appears highly variable to be seen. The source is located near the plane of the Milky Way, which is probably within our galaxy. That is just about everything astronomers know of this item.



The top five range of sources outside the galaxy are:

NGC 1275. This galaxy, also known as Perseus A, is located in the heart of a cluster of galaxies (at a distance of 233 million light years) and is known for his intense emission of radiation.

3C 454.3. This is an active galaxy, belonging to a class called "blazars" are mentioned. Like all active galaxies, emit two opposite winds bundles of radiation and high energy particles, which come from the swirling disk around a super massive black hole. Blazars are oriented such that only one of these jet streams to see. During the time period during which the map was created, 3C 454.3 was the brightest blazar at the sky. This blazar located at a distance of 7.3 billion light years - in the direction of the constellation Pegasus.

PKS 1502 +106. Blazar This is an extremely large distance of 10.1 billion light years and was only temporarily visible. The system was suddenly increased in brightness, even appeared on 3C 454.3, and then faded completely.

PKS 0727-115. This object is located in the plane of the Milky Way, but this is only a chance alignment. In reality it is a quasar (a class of active galaxies) at a distance of 9.6 billion light years.

Unknown. This source is located in the southern constellation Columba and is known as 0FGL J0614.3-3330. The source is probably outside the Milky Way, but this can not be determined with certainty. The source is also observed earlier by NASA's Compton Gamma Ray Observatory, but the nature of this object remains a mystery.

Original Source: NASA


Source: astrostart.nl