Summary: TEHRAN (FNA)- If our eyes could see
gamma rays, the Moon would appear brighter than the Sun!
The CTA, launched in 2006 as an international joint research project, will conduct observations of
gamma rays with a level of sensitivity aiming at ten times that of existing
gamma ray telescopes.
In the present study, the multiple gamma-ray detection capabilities of a cylindrical 76 mm x 76 mm (diameter x height) Ce[Br.sub.3] detector were studied through chlorine concentration measurements in saline water samples utilizing eight chlorine prompt
gamma rays [13] in conjunction with a portable neutron generator-based PGNAA setup [8, 12].
Instead of the dust lanes and star-filled patches of the visible-light Milky Way, Fermi's whole-sky map features a thin, bright stripe of
gamma rays emanating from the galactic plane, most of it coming from interstellar gas, pulsars, and stellar-mass black holes.
A small fraction of gargantuan stars end their lives in spectacular explosions that send a narrow beam of
gamma rays, the universe's highest-energy radiation, darting through space.
"Since the era of the EGRET instrument on the Compton
Gamma Ray Observatory in the 1990s, it has been discussed whether outbursts of radio emission are physically connected to similar events occurring at
gamma rays" Anton Zensus, Director at the Max Planck Institute for Radio Astronomy (MPIfR) and Fermi Affiliated Scientist said.
The high energy from massive stars broadly overlaps with
gamma rays, and a new generation of gamma-ray satellites and Cherenkov telescopes was the source for much of the information presented at the conference.
The electromagnetic spectrum ranges from radio waves (some of which have photon energies of 10-9 eV), through visible light (a few eV), to higher-energy x-rays (10 keV and up) and
gamma rays (mostly 100 keV and up).
Many astronomers believe that as the star fades away and becomes a black hole, it shoots
gamma rays into space.