Extreme UV imaging telescope array on the spectrum X-G satellite

1990 ◽  
Author(s):  
Alex Zehnder ◽  
Joerg Bialkowski ◽  
P. Buehler ◽  
E. Morenzoni ◽  
Nick Schlumpf ◽  
...  
Keyword(s):  
Telescope Array ◽  
Uv Imaging ◽  
Imaging Telescope ◽  
Extreme Uv

scholarly journals EUVITA - an extreme UV imaging telescope array with spectral capability

1993 ◽  
Vol 4 (2) ◽  
pp. 117-135 ◽  
Author(s):  
J. -L. Courvoisier ◽  
A. Orr ◽  
P. Bühler ◽  
A. Zehnder ◽  
R. Henneck ◽  
...  
Keyword(s):  
Telescope Array ◽  
Uv Imaging ◽  
Imaging Telescope ◽  
Extreme Uv

scholarly journals EUVITA — An extreme UV imaging telescope array with spectral capability

1993 ◽  
Vol 13 (12) ◽  
pp. 299-302
Author(s):  
T.J.-L. Courvoisier ◽  
A. Orr ◽  
P. Bühler ◽  
A. Zchnder ◽  
R. Henneck ◽  
...  
Keyword(s):  
Telescope Array ◽  
Uv Imaging ◽  
Imaging Telescope ◽  
Extreme Uv

scholarly journals Long term variations in the Extreme UV corona: the EIT/SoHO perspective

2001 ◽  
Vol 203 ◽  
pp. 501-504 ◽  
Author(s):  
J-F. Hochedez ◽  
F. Clette ◽  
E. Verwichte ◽  
D. Berghmans ◽  
P. Cugnon
Keyword(s):  
Extreme Ultraviolet ◽  
Cosmic Ray ◽  
Activity Cycle ◽  
Processing Technique ◽  
Image Processing Technique ◽  
Global View ◽  
Imaging Telescope ◽  
Extreme Uv ◽  
Long Term Variations

Since the start of the SoHO mission, EIT -the Extreme ultraviolet Imaging Telescope- offers a global view of the solar corona over the whole rising phase of the current activity cycle. Such a dataset is unprecedented. We give here the current results of an on-going investigation over the entire EIT archive. In the Fe XV images (2 MK), the on-disk and off-disk intensity distributions have been evaluated, and their evolution is described. Additionally, we developed an image processing technique that extracts the smallest detectable features. The cosmic ray hits are statistically disentangled from the solar point-like phenomena, and the trends in both rates are assessed.

X-Ray Transients in the SRG/eROSITA All-Sky Survey

2017 ◽  
Vol 14 (S339) ◽  
pp. 145-145
Author(s):  
A. Rau
Keyword(s):  
Survey Data ◽  
Time Domain ◽  
Scanning Strategy ◽  
Telescope Array ◽  
X Ray ◽  
Sky Survey ◽  
Wide Range ◽  
Imaging Telescope

AbstracteROSITA (the extended ROentgen Survey with an Imaging Telescope Array) onboard the Spectrum Roentgen Gamma mission will perform a deep all-sky X-ray survey. During the first four years of operation the satellite will scan the entire sky every once every half year, visiting any position between 8 and 500 times. The eROSITA scanning strategy will test a wide range of times-scales, from seconds to years, and thus provide a powerful window into the X-ray transient and variable sky. This contribution summarised the key science opportunities for time-domain studies with eROSITA, and presented strategies for finding transients in the all-sky survey data.

scholarly journals Observations of Her X-1 in low states during SRG/eROSITA all-sky survey

2021 ◽  
Vol 648 ◽  
pp. A39
Author(s):  
N. I. Shakura ◽  
D. A. Kolesnikov ◽  
P. S. Medvedev ◽  
R. A. Sunyaev ◽  
M. R. Gilfanov ◽  
...  
Keyword(s):  
Neutron Star ◽  
Accretion Disk ◽  
Telescope Array ◽  
Sky Surveys ◽  
X Ray ◽  
Sky Survey ◽  
Imaging Telescope ◽  
Optical Star ◽  
Orbital Modulation ◽  
Hot Corona

eROSITA (extended ROentgen Survey with an Imaging Telescope Array) instrument onboard the Russian-German ‘Spectrum-Roentgen-Gamma’ (SRG) mission observed the Her X-1/HZ Her binary system in multiple scans over the source during the first and second SRG all-sky surveys. Both observations occurred during a low state of the X-ray source when the outer parts of the accretion disk blocked the neutron star from view. The orbital modulation of the X-ray flux was detected during the low states. We argue that the detected X-ray radiation results from scattering of the emission of the central source by three distinct regions: (a) an optically thin hot corona with temperature ~(2−4) × 106 K above the irradiated hemisphere of the optical star; (b) an optically thin hot halo above the accretion disk; and (c) the optically thick cold atmosphere of the optical star. The latter region effectively scatters photons with energies above 5–6 keV.

INITIAL STEREO ANALYSIS OF MRK 421 FROM THE VERITAS TELESCOPES

2007 ◽  
Vol 22 (14n15) ◽  
pp. 2461-2467
Author(s):  
◽  
S. B. HUGHES
Keyword(s):  
Light Curve ◽  
Gamma Ray ◽  
Angular Resolution ◽  
Large Set ◽  
Telescope Array ◽  
Radiation Imaging ◽  
Stereo Analysis ◽  
Imaging Telescope ◽  
Energetic Radiation ◽  
Gamma Ray Telescopes

VERITAS (Very Energetic Radiation Imaging Telescope Array System), an array of ground-based gamma-ray telescopes in southern Arizona, USA, has been taking data in hardware stereo mode since March, 2006. The April–May 2006 dark run provided a large set of data from two telescopes on the known blazar Markarian (Mrk) 421. An initial analysis produced a light curve and preliminary cuts showing the two telescope array's angular resolution to be 0.19°. The remaining two VERITAS telescopes will be brought online by January, 2007.

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