Electrons in Atoms
... They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes On Earth, gamma waves are generated by nuclear explosions, lightning, and the less dramatic activity of radioactive decay Gamma rays ...
... They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes On Earth, gamma waves are generated by nuclear explosions, lightning, and the less dramatic activity of radioactive decay Gamma rays ...
Nucleosynthesis of heavy elements in gamma ray bursts
... Studying radioactive elements offers astronomers a more direct method for probing supernova blasts than observing non-radioactive elements. This is because this radioactive material glows with X-rays no matter what, while the Xrays detected by Chandra and other telescopes are generated only after he ...
... Studying radioactive elements offers astronomers a more direct method for probing supernova blasts than observing non-radioactive elements. This is because this radioactive material glows with X-rays no matter what, while the Xrays detected by Chandra and other telescopes are generated only after he ...
1410.PDF
... *Radii of all targets was about 3 mm, yielding an area of about 0.283 cm2. The volume of each target was 0.029 cm3 except for sample 8 which was 0.038 cm ...
... *Radii of all targets was about 3 mm, yielding an area of about 0.283 cm2. The volume of each target was 0.029 cm3 except for sample 8 which was 0.038 cm ...
Multiwavelength Astronomy: Your World in Different Lights
... These are two versions of the same image, with the same scale of temperature, but the right picture has a larger range of colors to show the same range in temperature. When there are more colors in the same temperature range, you can easily detect more detail about small temperature differences. Of ...
... These are two versions of the same image, with the same scale of temperature, but the right picture has a larger range of colors to show the same range in temperature. When there are more colors in the same temperature range, you can easily detect more detail about small temperature differences. Of ...
205 Advances in Natural and Applied Sciences, 4(2): 205-209, 2010 ISSN 1995-0772
... transferred matter spirals towards the compact object and forms an “accretion disk” around it. The accreted gaseous matter is heated to very high temperatures (106-108 K), releasing the energy it acquired through gravitational infill in the form of X-ray radiation. In case of a neutron star or a whi ...
... transferred matter spirals towards the compact object and forms an “accretion disk” around it. The accreted gaseous matter is heated to very high temperatures (106-108 K), releasing the energy it acquired through gravitational infill in the form of X-ray radiation. In case of a neutron star or a whi ...
PowerPoint - Astronomy at Swarthmore College
... and Mg XI (solid histograms) . Show are the resonant (left), intercombination (middle) and forbidden (right) lines. In hot stars, the forbidden-line strength of He-like ions is reduced by photoexcitation of electrons in the 3S1 state by photospheric UV radiation. We do not detect the Mg XI f line. T ...
... and Mg XI (solid histograms) . Show are the resonant (left), intercombination (middle) and forbidden (right) lines. In hot stars, the forbidden-line strength of He-like ions is reduced by photoexcitation of electrons in the 3S1 state by photospheric UV radiation. We do not detect the Mg XI f line. T ...
ppt - Leeds Astrophysics
... in the power law. The break is called the second knee. • Correct for varying energy scales: all agree on location of the second knee. • There are THREE spectral features in the UHE regime. • The ULTIMATE experiment is one which would see the three UHE cosmic ray features with good statistics! ...
... in the power law. The break is called the second knee. • Correct for varying energy scales: all agree on location of the second knee. • There are THREE spectral features in the UHE regime. • The ULTIMATE experiment is one which would see the three UHE cosmic ray features with good statistics! ...
Telescopes
... Telescopes: Key Concepts (1) Telescopes use either a lens or a mirror to gather light. (2) The main purposes of a telescope are to gather light and resolve detail. (3) Radio and microwave telescopes use a reflecting dish to focus waves. (4) Telescopes in orbit avoid the distorting effects of the at ...
... Telescopes: Key Concepts (1) Telescopes use either a lens or a mirror to gather light. (2) The main purposes of a telescope are to gather light and resolve detail. (3) Radio and microwave telescopes use a reflecting dish to focus waves. (4) Telescopes in orbit avoid the distorting effects of the at ...
X-RAYS AND GRAVITATIONAL WAVES: LIGO AND VIRGO POINT
... along the equator is at 0 degrees declination while a star at the north or south pole has a declination of 90 degrees or -90 degrees, respectively. electromagnetic waves: waves composed of coupled electric and magnetic fields. These waves are commonly known as light, although only a small portion of ...
... along the equator is at 0 degrees declination while a star at the north or south pole has a declination of 90 degrees or -90 degrees, respectively. electromagnetic waves: waves composed of coupled electric and magnetic fields. These waves are commonly known as light, although only a small portion of ...
Acrobat ® file - Numerical Recipes
... one quantum unit of phase space, or in terms of the phase space density N occupation number = N h3 : The deep result on thermal systems is that they have a universal mean occupation number given by occupation number = eE=kT1 1 : Notice that if E kT the 1 is negligible and we recover the classic ...
... one quantum unit of phase space, or in terms of the phase space density N occupation number = N h3 : The deep result on thermal systems is that they have a universal mean occupation number given by occupation number = eE=kT1 1 : Notice that if E kT the 1 is negligible and we recover the classic ...
Document
... Bazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAST. Several sources have been det ...
... Bazars are powerful gamma-ray sources. The most powerful of them have equivalent isotropic luminosity 1049 erg/s. Collimation θ2/2 ~ 10-2 – 10-3. θ – jet opening angle. EGRET detected 66 (+27) sources of this type. New breakthrough is expected after the launch of GLAST. Several sources have been det ...
Silicon microstrip detectors - ifm
... electrons from the atoms disturbing the structure of the material and creating loose electrons. Thus this interaction leaves a trace of disturbed matter and move the electrons from the original atoms to some terminals (wires, anodes) where they can be collected. This collected charge will be the sig ...
... electrons from the atoms disturbing the structure of the material and creating loose electrons. Thus this interaction leaves a trace of disturbed matter and move the electrons from the original atoms to some terminals (wires, anodes) where they can be collected. This collected charge will be the sig ...
Radiative Processes Overview
... rate of production due to Compton scattering of nonthermal and thermal electrons rate of removal by Compton scattering against nonthermal electrons with optical depth τCNΤ + rate removal of photons due to photon-photon interactions/pair creation with optical depth τγ γ rate of escape from region num ...
... rate of production due to Compton scattering of nonthermal and thermal electrons rate of removal by Compton scattering against nonthermal electrons with optical depth τCNΤ + rate removal of photons due to photon-photon interactions/pair creation with optical depth τγ γ rate of escape from region num ...
Determining the Effect of Diffuse X-ray Emission on Point Source Detection
... this file, we can use CIAO’s dmcopy tool to translate this events file into an image, or we can filter the image based on various characteristics. The data were first filtered based on energy, from 0.5 to 8 keV, to exclude cosmic ray and other particle-induced noise in that range. We then filtered based o ...
... this file, we can use CIAO’s dmcopy tool to translate this events file into an image, or we can filter the image based on various characteristics. The data were first filtered based on energy, from 0.5 to 8 keV, to exclude cosmic ray and other particle-induced noise in that range. We then filtered based o ...
Lab 7: Emission Spectra
... This is a hydrogen absorption spectrum. It looks like a continuous spectrum with a few specific colors missing, and that's exactly what it is. Those missing colors are light with a specific wavelength that has been absorbed by a hydrogen atom. What causes absorption lines? The electrons in atoms h ...
... This is a hydrogen absorption spectrum. It looks like a continuous spectrum with a few specific colors missing, and that's exactly what it is. Those missing colors are light with a specific wavelength that has been absorbed by a hydrogen atom. What causes absorption lines? The electrons in atoms h ...
pix_get_energy Synopsis Syntax Description
... Calculates the photon energy, in keV, for a given grating position and using the current pixlib settings. The x and y values are in the GAC coordinate system, and so represent the grating dispersion and cross−dispersion angles in degrees. The grating order − as set by pix_set_grating() − must be non ...
... Calculates the photon energy, in keV, for a given grating position and using the current pixlib settings. The x and y values are in the GAC coordinate system, and so represent the grating dispersion and cross−dispersion angles in degrees. The grating order − as set by pix_set_grating() − must be non ...
Spectral-Type Trends: Absorption
... Shown above on the left are the x-ray spectra of six O stars (and one B star) from the Chandra archive, arranged in order of decreasing surface temperature and mass-loss rate. As is evident from the data, the more luminous stars have stronger emission at short wavelengths. One possible explanation f ...
... Shown above on the left are the x-ray spectra of six O stars (and one B star) from the Chandra archive, arranged in order of decreasing surface temperature and mass-loss rate. As is evident from the data, the more luminous stars have stronger emission at short wavelengths. One possible explanation f ...
lecture2 - X-Ray
... UHURU The satellite was launched on December 12, 1970. The program was ended in March 1973. The other name SAS-1 2-20 keV The first full sky survey. 339 sources. ...
... UHURU The satellite was launched on December 12, 1970. The program was ended in March 1973. The other name SAS-1 2-20 keV The first full sky survey. 339 sources. ...
Intro to EM spectrum and analyzing starlight
... a spectrum. The numbers on the right side of the spectrum indicate wavelengths in nanometers (1 nm = 10-9 m). ...
... a spectrum. The numbers on the right side of the spectrum indicate wavelengths in nanometers (1 nm = 10-9 m). ...
Tom Maccarone (Texas Tech University)
... May have important implications for recent suggestion that bimodality of cluster colors is an artifact of color-metallicity relation, rather than real evidence of bimodality Only seen in NGC 1399, so may be related to location deep in a central cluster galaxy (Kundu et ...
... May have important implications for recent suggestion that bimodality of cluster colors is an artifact of color-metallicity relation, rather than real evidence of bimodality Only seen in NGC 1399, so may be related to location deep in a central cluster galaxy (Kundu et ...
Perspectives for neutron and gamma spectroscopy in high - ELI-NP
... most interesting constraints ofthe astrophysical models comes from the gamma ray mapping of 26Al across the Galaxy. This radio-isotope is produced through Asymptotic Giant Branch (AGB) and Wolf Rayet stars. Theoretical work [5] based on shell-model calculations predicts a dramatic reduction of the e ...
... most interesting constraints ofthe astrophysical models comes from the gamma ray mapping of 26Al across the Galaxy. This radio-isotope is produced through Asymptotic Giant Branch (AGB) and Wolf Rayet stars. Theoretical work [5] based on shell-model calculations predicts a dramatic reduction of the e ...
Study of interstrip gap effects and efficiency for full energy detection
... coincidences between more particles are requested. It is known that the segmentation of the electrodes affects the signal formation for particles whose trajectory crosses an interstrip region [1, 2, 3, 4, 5, 6]. In particular phenomena such as charge sharing and opposite polarity signals can occur. S ...
... coincidences between more particles are requested. It is known that the segmentation of the electrodes affects the signal formation for particles whose trajectory crosses an interstrip region [1, 2, 3, 4, 5, 6]. In particular phenomena such as charge sharing and opposite polarity signals can occur. S ...
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.