ALTERNATIVE DESIGNS FOR SPACE X
... mainly for purposes of semiconductor industry. Silicon is relatively light (volume density 2.3 g cm-3) and already during the manufacture process it is lapped and polished (either on one or on both sides) to very fine smoothness (better than few 0.1 nm) and thickness homogeneity (of the order of 1 m ...
... mainly for purposes of semiconductor industry. Silicon is relatively light (volume density 2.3 g cm-3) and already during the manufacture process it is lapped and polished (either on one or on both sides) to very fine smoothness (better than few 0.1 nm) and thickness homogeneity (of the order of 1 m ...
Astronomy Astrophysics The accretion environment in Vela X-1 during a flaring period using
... From T obs ≈ 40 ks to T obs ≈ 60 ks the source flux starts to rise in all energy bands. On top of the general rise, there is flaring visible on time scales of ks between T obs ≈ 45 ks and T obs ≈ 55 ks, again most pronounced in the 1–3 keV band. Around T obs ≈ 60 ks, the total source flux rises rapi ...
... From T obs ≈ 40 ks to T obs ≈ 60 ks the source flux starts to rise in all energy bands. On top of the general rise, there is flaring visible on time scales of ks between T obs ≈ 45 ks and T obs ≈ 55 ks, again most pronounced in the 1–3 keV band. Around T obs ≈ 60 ks, the total source flux rises rapi ...
Associated Spectral and Temporal State Transition of the
... that the system was in two different spectral states. While spectral variations have been observed in this source before, this data provides clear evidence that the spectral states also have distinct temporal properties. With a count rate of ∼ 1.5 counts/s and a fractional variability amplitude of ∼ ...
... that the system was in two different spectral states. While spectral variations have been observed in this source before, this data provides clear evidence that the spectral states also have distinct temporal properties. With a count rate of ∼ 1.5 counts/s and a fractional variability amplitude of ∼ ...
X-ray Emission from Massive Stars
... *don’t forget that thermal emitters give off photons with a range of wavelengths; those listed above represent the peak of the distribution or the characteristic wavelength. ...
... *don’t forget that thermal emitters give off photons with a range of wavelengths; those listed above represent the peak of the distribution or the characteristic wavelength. ...
PowerPoint - Chandra X
... RXJ0822-4300, deduced from 3 Chandra images over 5 years, implies a transverse space velocity of 1,600 km/s for an estimated distance of 7,000 light years. The unusually large space velocity is consistent with the explosion center inferred from proper motions of the oxygen-rich optical filaments, an ...
... RXJ0822-4300, deduced from 3 Chandra images over 5 years, implies a transverse space velocity of 1,600 km/s for an estimated distance of 7,000 light years. The unusually large space velocity is consistent with the explosion center inferred from proper motions of the oxygen-rich optical filaments, an ...
1 Ay 122a Fall 2015/16 – HOMEWORK #3
... in each band, and compare with the typical numbers listed in the class notes. If the “full well” of the detector pixels is ' 100, 000 electrons, what is the maximum exposure time you can use before the star becomes “saturated”? How long could you integrate if all of your objects are much fainter tha ...
... in each band, and compare with the typical numbers listed in the class notes. If the “full well” of the detector pixels is ' 100, 000 electrons, what is the maximum exposure time you can use before the star becomes “saturated”? How long could you integrate if all of your objects are much fainter tha ...
Deexcitation NSS 2004
... Rocks X-Ray Emission Library Test beams at BESSY labs have been undertaken in order to provide a set of X-Ray spectra from PSSL rocks that could be found rocky planets (Mars, Venus, Mercury) A total of 8 rocks have been irradiated and by now 5 of them have been ...
... Rocks X-Ray Emission Library Test beams at BESSY labs have been undertaken in order to provide a set of X-Ray spectra from PSSL rocks that could be found rocky planets (Mars, Venus, Mercury) A total of 8 rocks have been irradiated and by now 5 of them have been ...
Importance of Biologically Active Aurora
... particles from a variety of sources—from the host star to distant explosions—on a variety of timescales. Monte Carlo calculations of high-energy irradiation suggest that the surfaces of terrestrial-like planets with thick atmospheres (column densities greater than about 100 g cm-2) are well protecte ...
... particles from a variety of sources—from the host star to distant explosions—on a variety of timescales. Monte Carlo calculations of high-energy irradiation suggest that the surfaces of terrestrial-like planets with thick atmospheres (column densities greater than about 100 g cm-2) are well protecte ...
Chapter 5 Telescope Test
... 9. Explain how to observe an emission spectra of a specific atom and what you might observe that would help you identify the element. Fill In the Blank: 1. ____________uses a combination of mirrors and lenses to fold the optics to form an image. 2. The ratio of the focal length of the telescope to ...
... 9. Explain how to observe an emission spectra of a specific atom and what you might observe that would help you identify the element. Fill In the Blank: 1. ____________uses a combination of mirrors and lenses to fold the optics to form an image. 2. The ratio of the focal length of the telescope to ...
Definitions - Sackville School
... 1. Intensifier used as X-ray would pass through film 2. Intensifier converts X-ray photon to many visible (light) photons (which are absorbed by film) 3. Lower exposure / fewer X-rays needed 4. Iodine / barium (used as contrast material) 5. High Z number / large attenuation coefficient / large absor ...
... 1. Intensifier used as X-ray would pass through film 2. Intensifier converts X-ray photon to many visible (light) photons (which are absorbed by film) 3. Lower exposure / fewer X-rays needed 4. Iodine / barium (used as contrast material) 5. High Z number / large attenuation coefficient / large absor ...
The Electromagnetic Spectrum and Observing for Educators
... visible light, radio, infrared, X-rays etc. are all electromagnetic radiation, differing only by energy electromagnetic radiation can be considered to be a wave (with a certain wavelength), or a particle (photon) energy can be measured by frequency or by wavelength ...
... visible light, radio, infrared, X-rays etc. are all electromagnetic radiation, differing only by energy electromagnetic radiation can be considered to be a wave (with a certain wavelength), or a particle (photon) energy can be measured by frequency or by wavelength ...
The Evolution of Coronal X
... Since then the Sun has increased in luminosity by 30%, but conversely its EUV and X-ray coronal emission has declined by many orders of magnitude. Ultimately this is driven by angular momentum loss and the connection between the amplification and emergence of B-fields and rotation. It is the dissipa ...
... Since then the Sun has increased in luminosity by 30%, but conversely its EUV and X-ray coronal emission has declined by many orders of magnitude. Ultimately this is driven by angular momentum loss and the connection between the amplification and emergence of B-fields and rotation. It is the dissipa ...
Chandra Observation of Pulsar Wind Nebula
... Suggested by many theoretic works (Wheeler et al. 1975; Fryxell & Arnett 1981; Taam & Fryxell 1984; Chugai 1986; Marietta et al. 2000; Meng et al. 2007, etc.) but no direct observational evidence has been detected (Leonard 2004). ...
... Suggested by many theoretic works (Wheeler et al. 1975; Fryxell & Arnett 1981; Taam & Fryxell 1984; Chugai 1986; Marietta et al. 2000; Meng et al. 2007, etc.) but no direct observational evidence has been detected (Leonard 2004). ...
Talk
... are controlled by the magnetic topology (dipolar, tripolar, quadrupolar), which scales the size of acceleration regions in magnetic reconnection sites and causes sequential local reconnection events that propagate in parallel, perpendicular, and vertical direction to the neutral line. 2) Microscopic ...
... are controlled by the magnetic topology (dipolar, tripolar, quadrupolar), which scales the size of acceleration regions in magnetic reconnection sites and causes sequential local reconnection events that propagate in parallel, perpendicular, and vertical direction to the neutral line. 2) Microscopic ...
Solar Physics, Space Weather, and Wide-field X-ray
... by modeling the “as manufactured” mirrors and optimizing final detector plane position. ● Re-defined image quality requirem’t appropriate for wide-field X-ray imaging applications. ● Developed new X-ray telescope design to yield an 80% increase in performance over the NOAA Baseline Design. ...
... by modeling the “as manufactured” mirrors and optimizing final detector plane position. ● Re-defined image quality requirem’t appropriate for wide-field X-ray imaging applications. ● Developed new X-ray telescope design to yield an 80% increase in performance over the NOAA Baseline Design. ...
Particle Astrophysics Lecture 5 Gamma-ray Astronomy
... The Earth's atmosphere is opauqe to photons with energy above 10 eV, meaning that to observe gamma-rays directly we need to place the detector above the atmosphere. A turning point in gamma-ray astronomy was the launch of the first satellite-borne telescope, SAS-2, in 1972. The mayor limitation of s ...
... The Earth's atmosphere is opauqe to photons with energy above 10 eV, meaning that to observe gamma-rays directly we need to place the detector above the atmosphere. A turning point in gamma-ray astronomy was the launch of the first satellite-borne telescope, SAS-2, in 1972. The mayor limitation of s ...
Titelseite
... magnitudes in terms of their energy- roundabout 70 keV to 8 MeV. • Generally speaking the observed gamma particles have their origin in electron- positron annihilation or in the decay of radioactive elements. • The first gamma line from space was measured in the so-called HEAO-C1 experiment, which d ...
... magnitudes in terms of their energy- roundabout 70 keV to 8 MeV. • Generally speaking the observed gamma particles have their origin in electron- positron annihilation or in the decay of radioactive elements. • The first gamma line from space was measured in the so-called HEAO-C1 experiment, which d ...
The Nonmagnetic Field Surface Thermal Emission Model
... described in the text. From top to bottom, the panels show data from the pn, the MOS1 and the MOS2 cameras. In each panel the data are compared to the model folded through the instrumental response (upper plot); the lower plot shows the residuals in units of sigma. ...
... described in the text. From top to bottom, the panels show data from the pn, the MOS1 and the MOS2 cameras. In each panel the data are compared to the model folded through the instrumental response (upper plot); the lower plot shows the residuals in units of sigma. ...
PH507lecnote07_mcp3
... we want a detector that is only sensitive to the frequencies we are interested in. 2) Slow frequency of operation (typically 10 Hz). As the bolometer is only weakly connected to it’s heat sink, it takes a certain length of time for the bolometer to dissipate any absorbed energy. This greatly restric ...
... we want a detector that is only sensitive to the frequencies we are interested in. 2) Slow frequency of operation (typically 10 Hz). As the bolometer is only weakly connected to it’s heat sink, it takes a certain length of time for the bolometer to dissipate any absorbed energy. This greatly restric ...
Non-Optical Telescopes
... • These scopes must be kept very cold or the heat the scope itself radiates swamps out what they’re looking for. ...
... • These scopes must be kept very cold or the heat the scope itself radiates swamps out what they’re looking for. ...
white dwarf
... Radius of mirrors: 65 - 130 mm; Reflector Length: 100 mm Reflector thickness: 0.2 mm (Al) + Epoxy (~50 microns) + gold (1400 ...
... Radius of mirrors: 65 - 130 mm; Reflector Length: 100 mm Reflector thickness: 0.2 mm (Al) + Epoxy (~50 microns) + gold (1400 ...
Letter to the Editor - Max-Planck
... flux from a system similar to Cygnus X-1, located at a distance of ∼2 Mpc, and pointing toward us, would be rather weak (∼10 µJy). The analogue of the galactic soft state depends on the existence of a jet in this state. If there is no jet, the system would be practically in an off state with a lumin ...
... flux from a system similar to Cygnus X-1, located at a distance of ∼2 Mpc, and pointing toward us, would be rather weak (∼10 µJy). The analogue of the galactic soft state depends on the existence of a jet in this state. If there is no jet, the system would be practically in an off state with a lumin ...
A CHANDRA X-RAY STUDY OF THE DENSE GLOBULAR CLUSTER TERZAN... C. O. Heinke, P. D. Edmonds, J. E. Grindlay, and...
... Note.—Sources detected in and around Terzan 5. Units of right ascension are hours, minutes, and seconds, and units of declination are degrees, arcminutes, and arcseconds. Errors are centroiding errors within the (shifted to match GSC 2.2) Chandra frame and do not include systematic errors incurred i ...
... Note.—Sources detected in and around Terzan 5. Units of right ascension are hours, minutes, and seconds, and units of declination are degrees, arcminutes, and arcseconds. Errors are centroiding errors within the (shifted to match GSC 2.2) Chandra frame and do not include systematic errors incurred i ...
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.