scholarly journals Calibration of Photo-Multiplier Tubes in Fluorescence Detectors of the Telescope Array

2018 ◽  
Author(s):  
B. K. Shin ◽  
M. Fukushima ◽  
S. Ogio ◽  
Y. Tsunesada
Keyword(s):  
Telescope Array

scholarly journals The Crab nebula variability at short time-scales with the Cherenkov telescope array

2020 ◽  
Vol 501 (1) ◽  
pp. 337-346
Author(s):  
E Mestre ◽  
E de Oña Wilhelmi ◽  
D Khangulyan ◽  
R Zanin ◽  
F Acero ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Crab Nebula ◽  
Spectral Energy Distribution ◽  
Spectral Energy ◽  
Telescope Array ◽  
Cherenkov Telescopes ◽  
Cherenkov Telescope ◽  
Emission Models ◽  
Short Time ◽  
The Crab Nebula

ABSTRACT Since 2009, several rapid and bright flares have been observed at high energies (>100 MeV) from the direction of the Crab nebula. Several hypotheses have been put forward to explain this phenomenon, but the origin is still unclear. The detection of counterparts at higher energies with the next generation of Cherenkov telescopes will be determinant to constrain the underlying emission mechanisms. We aim at studying the capability of the Cherenkov Telescope Array (CTA) to explore the physics behind the flares, by performing simulations of the Crab nebula spectral energy distribution, both in flaring and steady state, for different parameters related to the physical conditions in the nebula. In particular, we explore the data recorded by Fermi during two particular flares that occurred in 2011 and 2013. The expected GeV and TeV gamma-ray emission is derived using different radiation models. The resulting emission is convoluted with the CTA response and tested for detection, obtaining an exclusion region for the space of parameters that rule the different flare emission models. Our simulations show different scenarios that may be favourable for achieving the detection of the flares in Crab with CTA, in different regimes of energy. In particular, we find that observations with low sub-100 GeV energy threshold telescopes could provide the most model-constraining results.

scholarly journals Properties of Faint X-ray Activity of XTE J1908+094 in 2019

Galaxies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 25
Author(s):  
Debjit Chatterjee ◽  
Arghajit Jana ◽  
Kaushik Chatterjee ◽  
Riya Bhowmick ◽  
Sujoy Kumar Nath ◽  
...  
Keyword(s):  
Black Hole ◽  
Temporal Analysis ◽  
Power Density Spectrum ◽  
Periodic Oscillations ◽  
Telescope Array ◽  
Density Spectrum ◽  
X Ray ◽  
Black Hole Candidate ◽  
Short Period ◽  
Spectral State

We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this outburst using observations from Nuclear Spectroscopic Telescope Array (NuSTAR). We have not observed any quasi-periodic-oscillations (QPOs) in the power density spectrum (PDS). The spectral study suggests that the source remained in the softer (more precisely, in the soft–intermediate) spectral state during this short period of X-ray activity. We notice a faint but broad Fe Kα emission line at around 6.5 keV. We also estimate the probable mass of the black hole to be 6.5−0.7+0.5M⊙, with 90% confidence.

scholarly journals Highlights from the Telescope Array Experiment

2014 ◽  
Vol 44 (5) ◽  
pp. 589-599 ◽  
Author(s):  
H. Sagawa ◽  
Keyword(s):  
Telescope Array

scholarly journals Calibration of multilayer mirrors for the Multi-Spectral Solar Telescope Array II

1995 ◽  
Author(s):  
Charles C. Kankelborg ◽  
James E. Plummer ◽  
Dennis S. Martinez-Galarce ◽  
Ray H. O'Neal ◽  
Craig E. DeForest ◽  
...  
Keyword(s):  
Solar Telescope ◽  
Multilayer Mirrors ◽  
Telescope Array

scholarly journals Dark matter and fundamental physics with the Cherenkov Telescope Array

2013 ◽  
Vol 43 ◽  
pp. 189-214 ◽  
Author(s):  
M. Doro ◽  
J. Conrad ◽  
D. Emmanoulopoulos ◽  
M.A. Sànchez-Conde ◽  
J.A. Barrio ◽  
...  
Keyword(s):  
Dark Matter ◽  
Fundamental Physics ◽  
Telescope Array ◽  
Cherenkov Telescope

scholarly journals Real-time beamforming using high-speed FPGAs at the Allen Telescope Array

Radio Science ◽  
2011 ◽  
Vol 46 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
William C. Barott ◽  
Oren Milgrome ◽  
Melvyn Wright ◽  
David MacMahon ◽  
Tom Kilsdonk ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Telescope Array
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