Star counts in the Galaxy-Simulating from very deep to very shallow
... stars of different absolute magnitude present different scale heights (and hence ρd (r)): Bahcall & Soneira (1980, 1984; and many authors later on) assigned the scale height of 325 pc for MV > 5.1, of 90 pc for MV < 2.3 dwarfs, and linearly interpolated in between. This separation was interpreted as a ...
... stars of different absolute magnitude present different scale heights (and hence ρd (r)): Bahcall & Soneira (1980, 1984; and many authors later on) assigned the scale height of 325 pc for MV > 5.1, of 90 pc for MV < 2.3 dwarfs, and linearly interpolated in between. This separation was interpreted as a ...
Photonic Crystal Nanocavities for Efficient Light Confinement and
... structure, in which the resonators are coupled together through the photonic crystal. One of the key challenges of using such multi-resonator structures lies in fabricating the individual resonators with sufficient accuracy to allow spectral alignment and mode-matching of light from one cavity to an ...
... structure, in which the resonators are coupled together through the photonic crystal. One of the key challenges of using such multi-resonator structures lies in fabricating the individual resonators with sufficient accuracy to allow spectral alignment and mode-matching of light from one cavity to an ...
2. Link Margin Calculations
... The same receiver positioned at an angle of 30o to the transmitter (approximately at the edge of the coverage area at 1.15 m from the center of the coverage area) on the same plane collects: Θp-p = (4.82+1)/2π ∙ cos4.82(30o) ∙ 10 W / 22 m2 ∙ cos(30o) ∙ 25E-6m2 = 25.1 µW. The typical responsivity of ...
... The same receiver positioned at an angle of 30o to the transmitter (approximately at the edge of the coverage area at 1.15 m from the center of the coverage area) on the same plane collects: Θp-p = (4.82+1)/2π ∙ cos4.82(30o) ∙ 10 W / 22 m2 ∙ cos(30o) ∙ 25E-6m2 = 25.1 µW. The typical responsivity of ...
THREE Li-RICH K GIANTS - Indian Institute of Astrophysics
... of comment: unusually broad lines of IRAS 175963952 and an asymmetric H profile of IRAS 123276523. The lines of IRAS 175963952 are obviously broader than those of the other two stars that have line widths typical of K giants. The additional broadening is attributed to a more rapid than average r ...
... of comment: unusually broad lines of IRAS 175963952 and an asymmetric H profile of IRAS 123276523. The lines of IRAS 175963952 are obviously broader than those of the other two stars that have line widths typical of K giants. The additional broadening is attributed to a more rapid than average r ...
Worldview - Leslie Looney
... (50-100x) than natural sources– 25 billion tons each year! http://www.climatechange.gc.ca/english/climate_change/images/ghg_effect_lg_e.jpg ...
... (50-100x) than natural sources– 25 billion tons each year! http://www.climatechange.gc.ca/english/climate_change/images/ghg_effect_lg_e.jpg ...
Magnetic Fields in Stars
... compass—and magnetic fields have been found in some hundreds of stars during the past 50 yr. Magnetic fields have been detected in T Tauri stars and other pre-mainsequence stars, several types of main sequence stars, white dwarfs and neutron stars. We now know a number of methods by which such magne ...
... compass—and magnetic fields have been found in some hundreds of stars during the past 50 yr. Magnetic fields have been detected in T Tauri stars and other pre-mainsequence stars, several types of main sequence stars, white dwarfs and neutron stars. We now know a number of methods by which such magne ...
Determining the Nature of a Double Star: The Law of Conservation
... 2.5 km s-1. From the stellar masses for the components (3.8 and 1.0 M), the projected separation (957 AU) and the expected semi-major axis (1,206 AU), I calculated a maximum orbital velocity of 2.34 km s-1 using equation (6). Using equation (15b), I calculated an escape velocity of 2.98 km s-1. It ...
... 2.5 km s-1. From the stellar masses for the components (3.8 and 1.0 M), the projected separation (957 AU) and the expected semi-major axis (1,206 AU), I calculated a maximum orbital velocity of 2.34 km s-1 using equation (6). Using equation (15b), I calculated an escape velocity of 2.98 km s-1. It ...
Cosmological Transient Objects
... • At the time of explosion, the supernova can shine brighter than the host galaxy consisting of billions of stars. • In one month, a supernova can emit as much energy as Sun would emit in its entire life span of billions of years. • GRBs: biggest source of gamma-rays in universe and 100 times more e ...
... • At the time of explosion, the supernova can shine brighter than the host galaxy consisting of billions of stars. • In one month, a supernova can emit as much energy as Sun would emit in its entire life span of billions of years. • GRBs: biggest source of gamma-rays in universe and 100 times more e ...
Colliding molecular clouds in head
... H2 formation from the atomic gas, it is unlikely that the large quantities of H2 observed could have formed from Hi. H2 is in fact the dominant phase in the Taffy bridge and is roughly half of the UGC 813/6 bridge ISM. If the grains are warm then the ability of H-atoms to form H2 on the grain surfac ...
... H2 formation from the atomic gas, it is unlikely that the large quantities of H2 observed could have formed from Hi. H2 is in fact the dominant phase in the Taffy bridge and is roughly half of the UGC 813/6 bridge ISM. If the grains are warm then the ability of H-atoms to form H2 on the grain surfac ...
485-146 - Wseas.us
... We have developed a novel integrated optical device based on new original technique of the electrooptical control of the spectral transfer function of Bragg gratings in LiNbO3 single-mode channel waveguides. The device could provide new functional capacity of the optical components for wavelength co ...
... We have developed a novel integrated optical device based on new original technique of the electrooptical control of the spectral transfer function of Bragg gratings in LiNbO3 single-mode channel waveguides. The device could provide new functional capacity of the optical components for wavelength co ...
Where Does Helium Come from?
... After the Plank Era, or between 10−43 and 10−35 s, we know that the universe, which had already expanded and cooled dramatically (but still a very hot ...
... After the Plank Era, or between 10−43 and 10−35 s, we know that the universe, which had already expanded and cooled dramatically (but still a very hot ...
Newton`s Rings - Manchester HEP
... lens is placed on a clean glass slide (optically flat) and viewed in monochromatic light, a series of rings may be seen around the point of contact between the lens and the slide. These rings are known as Newton's rings and they arise from the interference of light reflected from the glass surfaces ...
... lens is placed on a clean glass slide (optically flat) and viewed in monochromatic light, a series of rings may be seen around the point of contact between the lens and the slide. These rings are known as Newton's rings and they arise from the interference of light reflected from the glass surfaces ...
Atomic Theory - Relativistic quantum dynamics of ions and beams
... phase, frequency, polarization, and direction of propagation as the incident photons. ➣ Photoionization: results in free electrons. ➣ Rayleigh and Compton scattering: Elastic and inelastic scattering of X-rays and gamma rays by atoms and molecules. Compton scattering often leads to an decrease in th ...
... phase, frequency, polarization, and direction of propagation as the incident photons. ➣ Photoionization: results in free electrons. ➣ Rayleigh and Compton scattering: Elastic and inelastic scattering of X-rays and gamma rays by atoms and molecules. Compton scattering often leads to an decrease in th ...
The O 1s and V 2p X-ray Absorption Spectra of Vanadium Oxides
... addition, XAS shows convincingly that the lioles induced by Li substitution i11 ZnV204 contain mainly V 3d character. The oxygen chemistry of vanadium is particularly rich and leads to compounds witli very interesting physical and chemical properties[l]. The series V203, V02 and V 2 0 5 , for exampl ...
... addition, XAS shows convincingly that the lioles induced by Li substitution i11 ZnV204 contain mainly V 3d character. The oxygen chemistry of vanadium is particularly rich and leads to compounds witli very interesting physical and chemical properties[l]. The series V203, V02 and V 2 0 5 , for exampl ...
What CAN You See With a Telescope?
... Asteroids are now numbered in the order in which they were discovered. Can see that the relative brightness of the first four asteroids may have been a factor in their early discovery? Even Ceres, the brightest asteroid, is only a moderately bright star when seen through a telescope! Most asteroid ...
... Asteroids are now numbered in the order in which they were discovered. Can see that the relative brightness of the first four asteroids may have been a factor in their early discovery? Even Ceres, the brightest asteroid, is only a moderately bright star when seen through a telescope! Most asteroid ...
quantum physics i - The Physics Cafe
... Which one of the following correctly shows the change, if any, in the photoelectric current and in the maximum kinetic energy of the photoelectrons when light of the same intensity but higher frequency is incident on the same metal surface? ...
... Which one of the following correctly shows the change, if any, in the photoelectric current and in the maximum kinetic energy of the photoelectrons when light of the same intensity but higher frequency is incident on the same metal surface? ...
The Lagoon Nebula and its Vicinity
... of the H II region. A dark lane splits the optical nebula from NE to SW (the ‘Great Rift’); the lack of background stars in the Rift implies that it is an obscuring dust lane rather than a lack of material, but it does not show up clearly in submillimetre- or millimetrewave maps, either of spectral ...
... of the H II region. A dark lane splits the optical nebula from NE to SW (the ‘Great Rift’); the lack of background stars in the Rift implies that it is an obscuring dust lane rather than a lack of material, but it does not show up clearly in submillimetre- or millimetrewave maps, either of spectral ...
here - GLORIA Project
... Northern Lights. The Aurora Australis is visible especially in Antarctica (Fig. 1), although it can be seen from the southern areas of Australia and South America. Auroras are not a phenomenon unique to Earth. Other planets like Jupiter and Saturn, with strong magnetic fields, show similar pheno ...
... Northern Lights. The Aurora Australis is visible especially in Antarctica (Fig. 1), although it can be seen from the southern areas of Australia and South America. Auroras are not a phenomenon unique to Earth. Other planets like Jupiter and Saturn, with strong magnetic fields, show similar pheno ...
12.1 Elliptical galaxies
... galaxy, and major and minor axes are drawn. You can see as you go to ever larger radii, the axes seemed to rotate. [slide 8] So, this is still elliptical shapes. But, actually, ellipticals are not purely elliptical in shape. Pretty close, but not always exactly. And, the first deviation that you ...
... galaxy, and major and minor axes are drawn. You can see as you go to ever larger radii, the axes seemed to rotate. [slide 8] So, this is still elliptical shapes. But, actually, ellipticals are not purely elliptical in shape. Pretty close, but not always exactly. And, the first deviation that you ...
GALAXY FORMATION AND CLUSTER FORMATION Richard B
... containing gas (e.g. Sellwood and Carlberg 1984) show that, while dissipation tends to reduce Q and make the disk more unstable, the ensuing instabilities tend to raise the velocity dispersion again and maintain Q at a nearly constant value of about 2. If the gas layer in a disk galaxy is thus maint ...
... containing gas (e.g. Sellwood and Carlberg 1984) show that, while dissipation tends to reduce Q and make the disk more unstable, the ensuing instabilities tend to raise the velocity dispersion again and maintain Q at a nearly constant value of about 2. If the gas layer in a disk galaxy is thus maint ...
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.