Results 51 to 60 of about 157,734 (293)

Cosmic-ray-induced ionization in molecular clouds adjacent to supernova remnants - Tracing the hadronic origin of GeV gamma radiation [PDF]

, 2012
Energetic gamma rays (GeV to TeV photon energy) have been detected toward several supernova remnants (SNR) associated with molecular clouds. If the gamma rays are produced mainly by hadronic processes rather than leptonic processes like bremsstrahlung ...
Abdo, Abdo, Abdo, Abdo, Abdo, Aharonian, Becker, Bell, Bell, Biermann, Black, Blandford, Blandford, Blasi, Bozhokin, Bykov, Castro, Ceccarelli, Drury, Eichler, Ellison, F. Schuppan, Fermi, Herbst, Indriolo, Indriolo, Indriolo, J. H. Black, J. K. Becker, Jokipii, Kamae, Karlsson, Kelner, Krymskii, Lerche, Mannheim, McCarthy, Mori, Nath, Neufeld, Nicholas, Nicholas, Padovani, Padovani, Particle Data Group, S. Casanova, Schlickeiser, Schlickeiser, Scott, Skilling, Spitzer, Uchiyama, van der Tak, Yan, Zirakashvili, Zirakashvili   +55 more
core   +5 more sources

Gamma-ray luminosity function of gamma-ray bright AGNs [PDF]

Research in Astronomy and Astrophysics, 2009
Detection of Gamma-ray emission from a class of active galactic nuclei (viz blazars), has been one of the important findings from the Compton Gamma Ray Observatory (CGRO). However, their Gamma-ray luminosity function has not been well determined. Few attempts have been made in earlier works, where BL Lacs and Flat Spectrum Radio Quasars (FSRQs) have ...
Reshmi Mukherjee, Debbijoy Bhattacharya, Debbijoy Bhattacharya, P. Sreekumar   +3 more
openaire   +4 more sources

Radiatively decaying scalar dark matter through U(1) mixings and the Fermi 130 GeV gamma-ray line [PDF]

, 2012
In light of the recent observation of the Fermi-LAT 130 GeV gamma-ray line, we suggest a model of scalar dark matter in hidden sector, which can decay into two (hidden) photons. The process is radiatively induced by a GUT scale fermion in the loop, which is charged under a hidden sector U(1), and the kinetic mixing ($\sim \epsilon F^{\mu\nu}F'_{\mu\nu}$
arxiv   +1 more source

Multiwavelength Variability Analysis of 3C 279

Frontiers in Astronomy and Space Sciences, 2017
We present a multifrequency analysis of the variability in the flat-spectrum radio quasar 3C 279 from 2008 to 2014. Our multiwavelength datasets range from 1 mm to gamma-rays, with additional optical polarimetry.
Víctor M. Patiño-Álvarez, Sunil Fernandes, Vahram Chavushyan, Erique López-Rodríguez, Jonathan León-Tavares, Eric M. Schlegel, Luis Carrasco, José R. Valdés, Alberto Carramiñana   +8 more
doaj   +1 more source

High-energy Electromagnetic, Neutrino, and Cosmic-Ray Emission by Stellar-mass Black Holes in Disks of Active Galactic Nuclei

The Astrophysical Journal, 2023
Some Seyfert galaxies are detected in high-energy gamma rays, but the mechanism and site of gamma-ray emission are unknown. Also, the origins of the cosmic high-energy neutrino and MeV gamma-ray backgrounds have been veiled in mystery since their ...
Hiromichi Tagawa, Shigeo S. Kimura, Zoltán Haiman   +2 more
doaj   +1 more source

Discovery of Long-Lived Shape Isomeric States which Decay by Strongly Retarded High-Energy Particle Radioactivity

, 2000
The reaction 28Si + 181Ta has been studied at E(Lab) = 125 and 135 MeV. Coincidences between high energy particles and various X- and gamma-rays from abnormally long-lived states were observed. e.g.
A. MARINOV, D. KOLB, Kolb D., Marinov A., Marinov A., Marinov A., S. GELBERG, wiok S.   +7 more
core   +2 more sources

Induced variability in quantitative characters of groundnut (Arachis hypogaea L.) [PDF]

Electronic Journal of Plant Breeding, 2010
Groundnut genotype AK-280 was treated with EMS 40 mM, 60 mM, gamma rays 30 kR, 40 kR, 50 kR and combination treatment of EMS 20mM + gamma rays 20 kR. The observations on various quantitative characters were recorded in M2 generation.
N. G. Sonone, S. N. Deshmukh, S. B. Lanjewar and R. L. Bhakre
doaj  

Multiple Gamma-Ray Detection Capability of a CeBr3 Detector for Gamma Spectroscopy

Journal of Spectroscopy, 2017
The newly developed cerium tribromide (CeBr3) detector has reduced intrinsic gamma-ray activity with gamma energy restricted to 1400–2200 keV energy range.
A. A. Naqvi, F. Z. Khiari, F. A. Liadi, Khateeb ur-Rehman, M. Raashid, A. A. Isab   +5 more
doaj   +1 more source

Comparison of radiosensitivity of two rice (Oryza sativa L.) varieties to gamma rays and electron beam in M1 generation

Electronic Journal of Plant Breeding, 2017
The present study was carried out to compare effect of gamma rays and electron beam on two rice varieties viz., ADT-37 and ADT(R) 45. Dried seeds of both the varieties were treated with gamma rays and electron beam with different doses viz., 100Gy, 200Gy,
R. Gowthami, C. Vanniarajan, J. Souframanien and, M. Arumugam Pillai   +3 more
doaj   +1 more source

Constraints on the Gamma-Ray Emission from Small Solar System Bodies with the Fermi Large Area Telescope Data

The Astrophysical Journal, 2023
All known small solar system bodies have diameters between a few meters and a few thousands of kilometers. Based on the collisional evolution of solar system bodies, a larger number of asteroids with diameters down to ∼2 m is thought to exist.
S. De Gaetano, L. Di Venere, F. Gargano, F. Loparco, L. Lorusso, M. N. Mazziotta, G. Panzarini, R. Pillera, D. Serini   +8 more
doaj   +1 more source