搜索结果: 1-12 共查到“天体物理学 X-ray Emission”相关记录12条 . 查询时间(0.125 秒)
VHE gamma-ray Emission from Passive Supermassive Black Holes: Constraints for NGC 1399
Emission Passive Supermassive Black Holes
2011/9/28
Very high energy (VHE; >100 GeV) gamma-rays are expected to be emitted from the vicinity of super-massive black holes (SMBH), irrespective of their activity state. In the magnetosphere of rotating SMB...
An unified polar cap/striped wind model for pulsed radio and gamma-ray emission in pulsars
Pulsars general - Radiation mechanisms non-thermal - Gamma rays
2010/11/16
Thanks to the recent discovery by Fermi of about fifty new gamma-ray pulsars, it becomes possible to look for statistical properties of their pulsed high-energy emis-sion, especially their light-curve...
X-ray emission from early-type galaxies
Galaxies elliptical and lenticular cD – Galaxies evolution – Galaxies
2010/11/12
The last ∼10 years have seen a large progress in the X-ray investigation of earlytype galaxies of the local universe, and first attempts have been made to reach redshifts z > 0 for these objects...
Revisiting with Chandra the Scaling Relations of the X-ray Emission Components (Binaries, Nuclei and Hot Gas) of Early Type Galaxies
galaxies elliptical and lenticular – X-rays galaxies
2010/11/15
We have selected a sample of 30 normal (non-cD) early type galaxies, for all of which optical spectroscopy is available, and which have been observed with Chandra to a depth such to insure the detecti...
Search for gamma-ray emission from magnetars with the Fermi Large Area Telescope
stars magnetars X-rays stars
2010/11/9
We report on the search for 0.1{10 GeV emission from magnetars in 17 months of Fermi Large
Area Telescope (LAT) observations. No signi cant evidence for gamma-ray emission from any of the currently-k...
A mature cluster with X-ray emission at z=2.07
Galaxies clusters:general – Galaxies:clusters individual:CL J1449-0856 – Galaxies high-redshift large-scale structure of the Universe
2010/11/12
We report evidence for a fully established galaxy cluster at z = 2.07, consisting in a ∼ 20σ overdensity of red, compact spheroidal galaxies which spatially coincides with an extended X-ray emis...
On the origin of variable gamma-ray emission from the Crab Nebula
ISM supernova remnants MHD shock waves gamma-rays theory radiation mechanisms non-thermal
2010/11/12
The oblique geometry of pulsar wind termination shock ensures that the Doppler beaming has a strong impact on the shock emission. We illustrate this using recent relativistic MHD simulations of the Cr...
Evidence for gamma-ray emission from the low-mass X-ray binary system FIRST J102347.6+003841
gamma-ray emission the low-mass X-ray binary system
2011/1/10
The low-mass X-ray binary (LMXB) system FIRST J102347.6+003841 hosts a newly born millisecond pulsar (MSP) PSR J1023+0038 that was revealed as the first and only known rotation-powered MSP in a quiesc...
Diffuse Hard X-ray Emission in Starburst Galaxies as Synchrotron from Very High Energy Electrons
High Energy Astrophysical Phenomena (astro-ph.HE) Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/5
The origin of the diffuse hard X-ray emission of starburst galaxies is a long-standing problem. We suggest that synchrotron emission of 10 - 100 TeV electrons and positrons can contribute significantl...
GEANT4 Simulations of Gamma-Ray Emission from Accelerated Particles in Solar Flares
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
Gamma-ray spectroscopy provides diagnostics of particle acceleration in solar flares, but care must be taken when interpreting the spectra due to effects of the angular distribution of the accelerated...
A past capture event at Sagittarius A* inferred from the fluorescent X-ray emission of Sagittarius B clouds
High Energy Astrophysical Phenomena (astro-ph.HE) Galaxy Astrophysics (astro-ph.GA)
2010/12/27
The fluorescent X-ray emission from neutral iron in the molecular clouds (Sgr B) indicates that the clouds are being irradiated by an external X-ray source. The source is probably associated with the ...
A Chandra Census of C2D YSOS: Evolution of X-ray Emission
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
We present an analytical study of a large sample of ~109 young stellar objects in the X-ray. Our objects were detected in X-ray independent of age. Unexpectedly, the X-ray energy is somewhat correlate...