Results from the AMANDA Neutrino Telescope
... No extraterrestrial neutrino has been observed above the atmospheric background, YET… Increasingly stringent limits have been set in but sometimes point-like sources, diffuse fluxes, neutralinos… ...
... No extraterrestrial neutrino has been observed above the atmospheric background, YET… Increasingly stringent limits have been set in but sometimes point-like sources, diffuse fluxes, neutralinos… ...
Astroparticle Physics V 3 p 239 257 1995
... evaluation of the role played by the 457 keV state [22]. There is no detailed information on the de-excitation branching ratios of this level which should mainly decay directly to the ground state without involving the characteristic delayed P--y signature due to the contribution of the 190.4 keV st ...
... evaluation of the role played by the 457 keV state [22]. There is no detailed information on the de-excitation branching ratios of this level which should mainly decay directly to the ground state without involving the characteristic delayed P--y signature due to the contribution of the 190.4 keV st ...
Technical Challenges and Parameters for a Future Design Simon Swordy University of Chicago
... increase sensitivity at low energy (40GeV)- important for extragalactic sources, where source morphology is not as important. ...
... increase sensitivity at low energy (40GeV)- important for extragalactic sources, where source morphology is not as important. ...
1022_1.pdf
... That the comparison is indeed dramatic is illustrated in figure 1 the top portion of which shows a total projection of a gamma-gamma matrix previously measured with YRAST Ball following the 32S + 176Yb Æ 203Rn + 5n reaction. The spectrum is dominated by a very large, essentially smooth background or ...
... That the comparison is indeed dramatic is illustrated in figure 1 the top portion of which shows a total projection of a gamma-gamma matrix previously measured with YRAST Ball following the 32S + 176Yb Æ 203Rn + 5n reaction. The spectrum is dominated by a very large, essentially smooth background or ...
A search for ultra-high-energy gamma rays at the South Pole
... In the same year that Amundsen reached the South Pole, an Austrian physicist, Victor Hess, discovered that the outer layers of the Earth's atmosphere are continuously being bombarded by a rain of charged particles called cosmic rays. In yet another of many attempts which have been made in the ensuin ...
... In the same year that Amundsen reached the South Pole, an Austrian physicist, Victor Hess, discovered that the outer layers of the Earth's atmosphere are continuously being bombarded by a rain of charged particles called cosmic rays. In yet another of many attempts which have been made in the ensuin ...
Slide 1
... produced by high-energy particles (blue) and multimillion degree gas (red/green). In 1006 AD, what was thought to be a "new star" suddenly appeared in the sky and over the course of a few days became brighter than the planet Venus. The supernova of 1006, or SN 1006, may have been the ...
... produced by high-energy particles (blue) and multimillion degree gas (red/green). In 1006 AD, what was thought to be a "new star" suddenly appeared in the sky and over the course of a few days became brighter than the planet Venus. The supernova of 1006, or SN 1006, may have been the ...
Simbol-X: x-ray baffle for stray–light reduction. - IASF Palermo
... length: the shorter is the focal length the larger are the mirror slopes. This determines, as a consequence, a strong limitation of the available collecting area at high energies for optics with usual focal lengths (< 10 m). Larger focal lengths are therefore mandatory in order to focus harder X-ray ...
... length: the shorter is the focal length the larger are the mirror slopes. This determines, as a consequence, a strong limitation of the available collecting area at high energies for optics with usual focal lengths (< 10 m). Larger focal lengths are therefore mandatory in order to focus harder X-ray ...
VLT identifications in the Chandra/XMM
... This was constructed by combining images (smoothed with a Gaussian with r =1″ in three bands (0.3–1 keV, 1–3 keV, 3–7 keV), which contain approximately equal numbers of photons from detected sources. Blue sources are those undetected in the soft (0.5–2 keV) band, most likely due to intrinsic absorpt ...
... This was constructed by combining images (smoothed with a Gaussian with r =1″ in three bands (0.3–1 keV, 1–3 keV, 3–7 keV), which contain approximately equal numbers of photons from detected sources. Blue sources are those undetected in the soft (0.5–2 keV) band, most likely due to intrinsic absorpt ...
AMNH_colloquium_2May07_v7b
... do massive, hot stars make X-rays? Could we have been wrong about the lack of a magnetic dynamo - might massive star X-rays be similar to solar X-rays? Before we address this directly, we need to know about one very important property of massive stars… ...
... do massive, hot stars make X-rays? Could we have been wrong about the lack of a magnetic dynamo - might massive star X-rays be similar to solar X-rays? Before we address this directly, we need to know about one very important property of massive stars… ...
Radio-quiet Isolated Neutron Stars
... Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
... Detected in the RASS between 1990/09/14~1990/10/02. Identified with the 1992/10/16 PSPC data. No variability at levels greater than ~1% in 1hr, or <30% on timescale up to 15 years. ...
simulation of a time-of-flight telescope for suprathermal ions
... A Monte Carlo simulation of the SIT telescope aboard the STEREO spacecraft was performed by Geant 3.21 [1]. This is a powerful code which allows to simulate the whole experimental setup and tracks the particle within the setup taking into account the primary interaction of those particles with matte ...
... A Monte Carlo simulation of the SIT telescope aboard the STEREO spacecraft was performed by Geant 3.21 [1]. This is a powerful code which allows to simulate the whole experimental setup and tracks the particle within the setup taking into account the primary interaction of those particles with matte ...
Advanced information on the Nobel Prize in Physics 2002, 8 October
... the extraction efficiency was also found to be high for this isotope. The production of molecules with the argon atom, that would have made extraction more difficult, was checked to be low (Davis et al. 1972). The total background (Cleveland et al. 1998) of 37Ar from cosmic rays was estimated at 0.0 ...
... the extraction efficiency was also found to be high for this isotope. The production of molecules with the argon atom, that would have made extraction more difficult, was checked to be low (Davis et al. 1972). The total background (Cleveland et al. 1998) of 37Ar from cosmic rays was estimated at 0.0 ...
Refusing to Go Quietly: GRBs and Their Progenitors
... • If they are far out in the solar sytem, they must be produced by colliding balls of ice. Throwing snowballs may be more dangerous than we realized! ...
... • If they are far out in the solar sytem, they must be produced by colliding balls of ice. Throwing snowballs may be more dangerous than we realized! ...
Accretion
... • Magnetic loops rise out of the plane of the disk at any angle – the global field geometry is “tangled” • The field lines confine and carry plasma across the disk • Reconnection and snapping of the loops releases energy into the disk atmosphere – mostly in X-rays • The magnetic field also transfers ...
... • Magnetic loops rise out of the plane of the disk at any angle – the global field geometry is “tangled” • The field lines confine and carry plasma across the disk • Reconnection and snapping of the loops releases energy into the disk atmosphere – mostly in X-rays • The magnetic field also transfers ...
Name - MIT
... E) It is the next telescope that will be launched into space. 24) Which is not a reason why all large modern telescopes tend to be reflectors? A) It is much easier to make a high-quality mirror than the same quality lens B) Large mirrors are much lighter than large lenses C) Lenses focus different w ...
... E) It is the next telescope that will be launched into space. 24) Which is not a reason why all large modern telescopes tend to be reflectors? A) It is much easier to make a high-quality mirror than the same quality lens B) Large mirrors are much lighter than large lenses C) Lenses focus different w ...
Giant Resonance - Cyclotron Institute
... • Operate on the principle of total internal reflection – Most of fiber is core, surrounded by a thin “cladding” with a lower index of refraction. – At incident angles greater than the critical angle (θc=sin-1(nc/nf)) all light is reflected internally. ...
... • Operate on the principle of total internal reflection – Most of fiber is core, surrounded by a thin “cladding” with a lower index of refraction. – At incident angles greater than the critical angle (θc=sin-1(nc/nf)) all light is reflected internally. ...
Gamma - Ray Observations of Olaf Reimer
... transients on time scales of 1 day at flux levels of 106 cm-2s-1 , even in crowded, high diffuse emission Galactic plane regions. NO detectable simultaneous hard X-ray emission (F < 20-30 mCrab, 18-60 keV, 1-day integration) GLAST: Expectations translated into full-scale transient trigger and follow ...
... transients on time scales of 1 day at flux levels of 106 cm-2s-1 , even in crowded, high diffuse emission Galactic plane regions. NO detectable simultaneous hard X-ray emission (F < 20-30 mCrab, 18-60 keV, 1-day integration) GLAST: Expectations translated into full-scale transient trigger and follow ...
chapter 4
... When an electron moves from a lower energy level to a higher one, a photon is absorbed. When an electron moves from a higher energy level to a lower energy one, a photon is emitted. The energy of the photon, and thus its wavelength, are determined by the energy difference between the two energy leve ...
... When an electron moves from a lower energy level to a higher one, a photon is absorbed. When an electron moves from a higher energy level to a lower energy one, a photon is emitted. The energy of the photon, and thus its wavelength, are determined by the energy difference between the two energy leve ...
Semiar PPT
... of a massive star (at least in several cases!). 2. The short GRBs have much less energy and are associated with old stellar population. ...
... of a massive star (at least in several cases!). 2. The short GRBs have much less energy and are associated with old stellar population. ...
NGC 5746 :: NGC 5746 Handout - Chandra X
... Spiral galaxies are thought to form from enormous clouds of intergalactic gas that collapse to form spinning disks of stars and gas. The Chandra data and computer simulations show that the likely origin of NGC 5746's hot halo is the gradual inflow of intergalactic matter left over from the formation ...
... Spiral galaxies are thought to form from enormous clouds of intergalactic gas that collapse to form spinning disks of stars and gas. The Chandra data and computer simulations show that the likely origin of NGC 5746's hot halo is the gradual inflow of intergalactic matter left over from the formation ...
Gamma-Ray Astroparticle Physics
... We see only a narrow band of colors, from red to purple in the rainbow Also the colors we don’t see have names familiar to us: we listen to the radio, we heat food in the microwave, we take pictures of our bones through X-rays… ...
... We see only a narrow band of colors, from red to purple in the rainbow Also the colors we don’t see have names familiar to us: we listen to the radio, we heat food in the microwave, we take pictures of our bones through X-rays… ...
X-ray astronomy detector
X-ray astronomy detectors are instruments that detect X-rays for use in the study of X-ray astronomy.X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray emission from celestial objects. X-radiation is absorbed by the Earth's atmosphere, so instruments to detect X-rays must be taken to high altitude by balloons, sounding rockets, and satellites. X-ray astronomy is part of space science.X-ray astronomy detectors have been designed and configured primarily for energy and occasionally for wavelength detection using a variety of techniques usually limited to the technology of the time.