Chapter 15 - dysoncentralne
... manufacture. The colors visible on the discs’ surfaces are characteristic of the light used in the photograph. Have students verify the ability of a compact disc to separate light into its particular spectrum by reflecting light from different sources off a compact disc’s surface. For example, sunli ...
... manufacture. The colors visible on the discs’ surfaces are characteristic of the light used in the photograph. Have students verify the ability of a compact disc to separate light into its particular spectrum by reflecting light from different sources off a compact disc’s surface. For example, sunli ...
Intense switchable fluorescence in light wave coupled electrowetting
... layer. LWC operation utilizes this effect of total internal reflection to turn the device OFF. As shown in Fig. 2(b) the fluorescence emission from the LWC device is switched OFF via EW. As voltage is applied to the water it is electrostatically attracted toward the hydrophobic insulator. This displ ...
... layer. LWC operation utilizes this effect of total internal reflection to turn the device OFF. As shown in Fig. 2(b) the fluorescence emission from the LWC device is switched OFF via EW. As voltage is applied to the water it is electrostatically attracted toward the hydrophobic insulator. This displ ...
The Evolution of the Universe - Western Washington University
... in the first place. In fact, the closer we look to time "zero," the less certain we are about what actually happened, because our current description of physical laws do not yet apply to such extremes of nature. The Big Bang scenario simply assumes that space, time, and energy already existed. But i ...
... in the first place. In fact, the closer we look to time "zero," the less certain we are about what actually happened, because our current description of physical laws do not yet apply to such extremes of nature. The Big Bang scenario simply assumes that space, time, and energy already existed. But i ...
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... A. It would be only 1/3 as bright B. It would be only 1/6 as bright. C. It would be only 1/9 as bright. D. It would be three times brighter. ...
... A. It would be only 1/3 as bright B. It would be only 1/6 as bright. C. It would be only 1/9 as bright. D. It would be three times brighter. ...
Hypervelocity Stars and the Galactic Center
... HVS with g ′ < 21.5 per 50 deg2 of sky (Kollmeier & Gould 2007). In the Galactic Center, there is some indication that the stellar mass function is top heavy (Maness et al. 2007). A Salpeter mass function predicts an order-of-magnitude lower density of F-type HVSs, 1 per ∼500 deg2 (Brown et al. 2007 ...
... HVS with g ′ < 21.5 per 50 deg2 of sky (Kollmeier & Gould 2007). In the Galactic Center, there is some indication that the stellar mass function is top heavy (Maness et al. 2007). A Salpeter mass function predicts an order-of-magnitude lower density of F-type HVSs, 1 per ∼500 deg2 (Brown et al. 2007 ...
The relation among black holes, their host galaxies and AGN activity
... later and take more time to grow. See also Merloni 2004. ...
... later and take more time to grow. See also Merloni 2004. ...
Neutron Stars
... with Prof. Antony Hewish at Cambridge. Pulsars derive their name from ”pulsating radio sources” because they were first observed at radio wave frequencies. Hewish won the 1974 Nobel Prize in Physics along with Sir Martin Ryle for their ”pioneering discoveries in radio astrophysics.” Hewish was cited ...
... with Prof. Antony Hewish at Cambridge. Pulsars derive their name from ”pulsating radio sources” because they were first observed at radio wave frequencies. Hewish won the 1974 Nobel Prize in Physics along with Sir Martin Ryle for their ”pioneering discoveries in radio astrophysics.” Hewish was cited ...
Astrophysical and astrochemical insights into the origin of life
... in turn divisible into the so-called diffuse clouds which are characterized by visual extinctions Av ∼ 1 mag, densities of the order of 100 atoms cm−3 , and temperatures ∼100 K; dense clouds with Av > 5 mag, densities >103 cm−3 , and temperatures as low as 10 K; and the translucent clouds that are i ...
... in turn divisible into the so-called diffuse clouds which are characterized by visual extinctions Av ∼ 1 mag, densities of the order of 100 atoms cm−3 , and temperatures ∼100 K; dense clouds with Av > 5 mag, densities >103 cm−3 , and temperatures as low as 10 K; and the translucent clouds that are i ...
Open clusters and associations in the Gaia era
... Not so long ago, the usual way to search for members was to select candidates based on their photometric properties and then to do follow-up observations for each object to confirm its membership based on spectroscopy and/or kinematics. Over the last ten years, full sky proper motion catalogs such a ...
... Not so long ago, the usual way to search for members was to select candidates based on their photometric properties and then to do follow-up observations for each object to confirm its membership based on spectroscopy and/or kinematics. Over the last ten years, full sky proper motion catalogs such a ...
Module3: Life of a Star
... its life as a white dwarf star - a hot, dense core. If this hot core has a binary companion star (two stars orbiting around a common centre of mass), the white dwarf will pull matter from the companion star onto its surface, until it becomes unstable and explodes as a supernova. Type Ia supernova ca ...
... its life as a white dwarf star - a hot, dense core. If this hot core has a binary companion star (two stars orbiting around a common centre of mass), the white dwarf will pull matter from the companion star onto its surface, until it becomes unstable and explodes as a supernova. Type Ia supernova ca ...
A Tale of Two Physics
... acceleration as it does now. This begat the non-mathematical inflation theory as the "solution" to a problem that should have been a warning that physics was on the wrong track when the WMAP showed too much homogeneity for the universe to only be 13.8 billion years old. Thus begins another round of ...
... acceleration as it does now. This begat the non-mathematical inflation theory as the "solution" to a problem that should have been a warning that physics was on the wrong track when the WMAP showed too much homogeneity for the universe to only be 13.8 billion years old. Thus begins another round of ...
Chapter15.1
... – If we measure a star’s apparent brightness and distance, we can compute its luminosity with the inverse square law for light. – Parallax tells us distances to the nearest stars. ...
... – If we measure a star’s apparent brightness and distance, we can compute its luminosity with the inverse square law for light. – Parallax tells us distances to the nearest stars. ...
Inter 1-4
... Fringes with white light When white light is used the center fringe at O is white since all waves will constructively interfere here while the fringes on the both side of O are colored because the fringe width () depends on wavelength of light. Position of nth bright fringe for different are: ...
... Fringes with white light When white light is used the center fringe at O is white since all waves will constructively interfere here while the fringes on the both side of O are colored because the fringe width () depends on wavelength of light. Position of nth bright fringe for different are: ...
the Ëg infrared search for extraterrestrial civilizations with large
... Most relevant to the present paper are the parameters γ (waste heat luminosity, expressed as a fraction of the starlight available to the civilization) and Twaste , the characteristic temperature of the waste heat (which dictates its infrared colors). For values of Twaste in the 100–600 K range, val ...
... Most relevant to the present paper are the parameters γ (waste heat luminosity, expressed as a fraction of the starlight available to the civilization) and Twaste , the characteristic temperature of the waste heat (which dictates its infrared colors). For values of Twaste in the 100–600 K range, val ...
Evidence of suppression of star formation by quasar
... lines, polycyclic aromatic hydrocarbon (PAH) features and mid- and far-infrared luminosities (Kennicutt 1998a). In AGN, however, all these diagnostics can be severely affected by ionizing radiation by the AGN which introduces a large scatter to these calibrations. We utilize the least biased techniq ...
... lines, polycyclic aromatic hydrocarbon (PAH) features and mid- and far-infrared luminosities (Kennicutt 1998a). In AGN, however, all these diagnostics can be severely affected by ionizing radiation by the AGN which introduces a large scatter to these calibrations. We utilize the least biased techniq ...
Theory and experimental verification of Kapitza-Dirac-Talbot
... quantum phenomena to advanced applications in the materials sciences and in quantum metrology. All these experiments require optical elements for the coherent manipulation of matter waves. While clean solid surfaces and bulk crystal structures are well-adapted to the diffraction of electrons and neu ...
... quantum phenomena to advanced applications in the materials sciences and in quantum metrology. All these experiments require optical elements for the coherent manipulation of matter waves. While clean solid surfaces and bulk crystal structures are well-adapted to the diffraction of electrons and neu ...
Nuclear Astrophysics
... 15O abundances will quickly reach equilibrium. Exercise for you: set the time derivatives of 13N (15O) to zero in the set of equations on page 2. Then eliminate 13N (15O) from the system of equations, allowing us to now approximate the CNO cycle with the following system of equations: ...
... 15O abundances will quickly reach equilibrium. Exercise for you: set the time derivatives of 13N (15O) to zero in the set of equations on page 2. Then eliminate 13N (15O) from the system of equations, allowing us to now approximate the CNO cycle with the following system of equations: ...
On the role of the WNH phase in the evolution of very massive stars
... sequence with hydrogen in their spectra. These have been commonly referred to as WNL stars (WN7h, for example), but this new shorthand avoids confusion because there are late-type WN stars without hydrogen and early-type WN stars with hydrogen. Clearly differentiating WNH stars from H-poor/Hfree WN ...
... sequence with hydrogen in their spectra. These have been commonly referred to as WNL stars (WN7h, for example), but this new shorthand avoids confusion because there are late-type WN stars without hydrogen and early-type WN stars with hydrogen. Clearly differentiating WNH stars from H-poor/Hfree WN ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.