Results 111 to 120 of about 2,261,840 (225)

Sedimentary facies and stacking patterns of fluvio‐deltaic and ‐estuarine deposits from the Palaeoarchean Moodies Group in the Stolzburg Syncline (Barberton Greenstone Belt, South Africa)

open access: yesThe Depositional Record, Volume 12, Issue 4, September 2026.
Drillcore BASE‐5B from the Stolzburg Syncline, Barberton Greenstone Belt, reveals a coarsening‐upward, river‐dominated fluvio‐deltaic succession transitioning upward to a fining‐upward, tide‐dominated‐estuarine succession. Abstract Investigating fluvio‐marine depositional environments from early geological times is of great importance, as they provide ...
Sanway Mukhopadhyay   +5 more
wiley   +1 more source

V.H.E. Gamma Rays From Microquasars [PDF]

open access: yes, 2006
This thesis is concerned with the detection of very high energy (VHE) 7-rays from microquasars, a recently discovered subclass of x-ray binaries that display jets of relativistic particles.
Latham, Ian James
core  

Tutorial guide to X-ray and gamma-ray astronomy: data reduction and analysis

open access: yes, 2020
This book provides a comprehensive introduction to X-ray and gamma-ray astronomy. The first part discusses the basic theoretical and observational topics related to black hole astrophysics; the optics and the detectors employed in X-ray and gamma-ray ...
Bambi, Cosimo
core   +1 more source

Explaining the Origin of TeV Gamma Rays from M87 during High and Low States

open access: yesThe Astrophysical Journal
The detection of very-high-energy gamma rays from M87 can provide crucial insights into particle acceleration and radiation mechanisms in jets. The recent observations by the Large High Altitude Air Shower Observatory detector extend the energy range of ...
Nibedita Mondal   +2 more
doaj   +1 more source

Gamma ray Cerenkov telescope image analysis [PDF]

open access: yes, 1997
The subject of this thesis is ground based gamma ray astronomy using the imaging atmospheric Cerenkov technique. The first two chapters are introductory, and describe the field of gamma ray astronomy, the generation of extensive air showers in the ...
Holder, J., Holder, Jamie
core  

Physics from Time Variability of the VHE Blazar PKS 2155-304 [PDF]

open access: yes, 2010
Blazars are the principal extragalactic sources of very high energy gamma-ray emission in the Universe. These objects constitute a sub-class of Active Galactic Nuclei whose emission is dominated by Doppler boosted non-thermal radiation from plasma ...
BARRES-DE-ALMEIDA, ULISSES
core  

Very high energy cosmic gamma rays from radio and x-ray pulsars [PDF]

open access: yes, 1987
This thesis is concerned with the detection of very high energy cosmic gamma-rays from isolated pulsars and X-ray binary sources using the atmospheric Cerenkov technique. A general introduction to gamma ray detection techniques is followed by adscription
Chadwick, P.M, Chadwick, Mary Paula
core  

A New Measurement of the Extragalactic Background Light Using 15 yr of Fermi-large Area Telescope Data

open access: yesThe Astrophysical Journal
The extragalactic background light (EBL) from ultraviolet to infrared comprises the emission from all stars, galaxies, and actively accreting black holes in the observable Universe. A precise measurement of the EBL is critically important to probe models
Anuvab Banerjee   +7 more
doaj   +1 more source

Study of Silicon Photomultipliers for the GRIPS Calorimeter Module

open access: yesActa Polytechnica, 2013
GRIPS is a proposed gamma-ray (200 keV to 80 MeV) astronomy mission, which incorporates a pair-creation and Compton scattering telescope, along with X-ray and infrared telescopes.
Alexei Ulyanov   +3 more
doaj  

Gamma-ray Astronomy

open access: yes, 2007
The relevance of gamma-ray astronomy to the search for the origin of the galactic and, to a lesser extent, the ultra-high-energy cosmic rays has long been recognised. The current renaissance in the TeV gamma-ray field has resulted in a wealth of new data on galactic and extragalactic particle accelerators, and almost all the new results in this field ...
openaire   +2 more sources

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