Geminga


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Geminga

(ɡɛˈmiːŋɡa; dʒəˈmiːŋɡə)
n
(Astronomy) astronomy one of the brightest and nearest gamma-ray sources, situated in the constellation Gemini. A pulsar, it is believed to be a spinning neutron star
[C20: from Gemini + gamma ray]
References in periodicals archive ?
Along this track, a detection of a TeV halo around Geminga has recently been reported in [215]: in that paper a naive estimate of the diffusion coefficient in the vicinity of Geminga is presented, which turns out to be much smaller than the average galactic one inferred by secondary-to-primary ratios, posing a challenge both to CR transport models and to the pulsar interpretation of the positron anomaly as well; see also the follow-up detailed discussion in [216].
Holt (NASA-Goddard Space Flight Center) have detected pulsed X-ray emissions from Geminga, a point source of high-energy gamma rays that has defied explanation for 20 years....
Despite these similarities, however, Geminga was seen emitting gamma-ray pulses with no bright radio emission, while B0355+54 is one of the brightest radio pulsars known yet without a visible gamma ray signature.
To explain the observations of Geminga, a model of a dense neutron star with localized protons was proposed [29,30].
Felber was also an officer at Geminga Medical, Inc., a medical software company in which he developed and sold a software application that calculated impairment of the upper extremity of the human body.
In the July 31 Physical Review Letters, the team suggests that the source of the electron-positron excess could be Geminga, a rapidly rotating stellar corpse known to emit gamma rays.
Using the Chandra X-ray Observatory, Bettina Posselt (Penn State University) and colleagues studied two very different pulsars, Geminga (left) and B0355+54, both of which are surrounded by clouds of X-ray-emitting particles, called pulsar wind nebulae, that are swept back by the pulsars' passage.
The protons may also get their energy from a nearby pulsar, such as Geminga, a relatively young pulsar surrounded by a highly magnetized nebula capable of generating high-energy particles.
Geminga "Powerful new observatories almost always solve longstanding astronomical mysteries.
Geminga, as the source became named, evaded detection with optical and radio telescopes of that era because it emits about 99% of its energy as gamma rays.
Another team, led by John Mattox of Boston University, analyzed the motion of a very different type of star, an extremely compact X-ray and gamma-ray emitter known as Geminga. The rapidly rotating remnant of a supernova explosion from 300,000 years ago, Geminga acts like a lighthouse beacon, regularly beaming radiation toward Earth.
A mysterious object called Geminga (for Gemini gamma-ray source) has turned out to be a pulsar.