A New Model without Dark Matter for the Rotation of Spiral Galaxies
... in the gas, there is often measurable expansion with higher radial velocities occurring near the nucleus” and also they show that “radially progressive bursts of star format ion can account for a wide range of these observed phenomena and could be related to the presence of liners in the interstella ...
... in the gas, there is often measurable expansion with higher radial velocities occurring near the nucleus” and also they show that “radially progressive bursts of star format ion can account for a wide range of these observed phenomena and could be related to the presence of liners in the interstella ...
How Light Works - NYU Web Publishing
... At first, physicists were reluctant to accept the dual nature of light. After all, many of us humans like to have one right answer. But Einstein paved the way in 1905 by embracing wave-particle duality. We've already discussed the photoelectric effect, which led Einstein to describe light as a photo ...
... At first, physicists were reluctant to accept the dual nature of light. After all, many of us humans like to have one right answer. But Einstein paved the way in 1905 by embracing wave-particle duality. We've already discussed the photoelectric effect, which led Einstein to describe light as a photo ...
Energy in The Universe - Physics Department, Princeton University
... graded by slow processes of internal en ergy dissipation or by random encounters ...
... graded by slow processes of internal en ergy dissipation or by random encounters ...
pdf - at www.arxiv.org.
... (Fig. 3B), and this remains almost unchanged with higher-order polynomial modeling (10). With traditional calibration techniques, such as thorium comparison lamps, I2 gas absorption cells or Earth’s atmospheric absorption lines for calibration achieve ∼10 m s−1 absolute precision per calibration lin ...
... (Fig. 3B), and this remains almost unchanged with higher-order polynomial modeling (10). With traditional calibration techniques, such as thorium comparison lamps, I2 gas absorption cells or Earth’s atmospheric absorption lines for calibration achieve ∼10 m s−1 absolute precision per calibration lin ...
Application Exercise: Distances to Stars Using Measured Parallax
... One of the most difficult problems in astronomy is determining the distances to objects in the sky. There are four basic methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby ...
... One of the most difficult problems in astronomy is determining the distances to objects in the sky. There are four basic methods of determining distances: radar, parallax, standard candles, and the Hubble Law. Each of these methods is most useful at certain distances, with radar being useful nearby ...
Supplementary Information (doc 4223K)
... gold dimer periods. With the increase of the period of the gold dimer, the transparency window center of the metamaterial-induced transparency also has an obvious red-shift, and the left valley (i.e. in the shorter wavelength) adjacent to the transparency peak becomes shallow. Because the left valle ...
... gold dimer periods. With the increase of the period of the gold dimer, the transparency window center of the metamaterial-induced transparency also has an obvious red-shift, and the left valley (i.e. in the shorter wavelength) adjacent to the transparency peak becomes shallow. Because the left valle ...
Astronomy Astrophysics Spectral energy distributions of an AKARI-SDSS-GALEX sample of galaxies
... derives physical information about galaxies by fitting their UVto-far-IR SED (Noll et al. 2009b; Giovannoli et al. 2010). A Bayesian analysis is used to derive galaxy properties similar to that developed by Kauffmann et al. (2003a). CIGALE combines a UV-optical stellar SED and a dust, IR-emitting com ...
... derives physical information about galaxies by fitting their UVto-far-IR SED (Noll et al. 2009b; Giovannoli et al. 2010). A Bayesian analysis is used to derive galaxy properties similar to that developed by Kauffmann et al. (2003a). CIGALE combines a UV-optical stellar SED and a dust, IR-emitting com ...
LED Turning Lights on the Traction Avant
... which are of the latter type. In the case of LED’s the older clockworks have an advantage, as LED’s will work with them as well as light bulbs. Scintex and similar bi-metal based flashers will, however, not work with LED’s as they require the resistance of the (2x18 watt) light bulbs to heat up the ...
... which are of the latter type. In the case of LED’s the older clockworks have an advantage, as LED’s will work with them as well as light bulbs. Scintex and similar bi-metal based flashers will, however, not work with LED’s as they require the resistance of the (2x18 watt) light bulbs to heat up the ...
Blue light hazard
... exposure to ultraviolet (UV) radiation. Wavelengths shorter than 320 nm are most effective in causing this condition. The peak of the action spectrum is approximately at 270 nm. Note: Different action spectra have been published for photokeratitis and photoconjuctivitis (CIE 106/2 and CIE 106/3– 199 ...
... exposure to ultraviolet (UV) radiation. Wavelengths shorter than 320 nm are most effective in causing this condition. The peak of the action spectrum is approximately at 270 nm. Note: Different action spectra have been published for photokeratitis and photoconjuctivitis (CIE 106/2 and CIE 106/3– 199 ...
JC Beamín1,2, RA Mendez3,2, RL Smart4, R. Jara3, R
... eighteen previously known high proper motion sources, including precise parallaxes for these sources for the first time. In this pioneer study we show the capability of the VVV project to measure high precision trigonometric parallaxes for very low mass stars (VLMS) up to distances of ~400 pc reachi ...
... eighteen previously known high proper motion sources, including precise parallaxes for these sources for the first time. In this pioneer study we show the capability of the VVV project to measure high precision trigonometric parallaxes for very low mass stars (VLMS) up to distances of ~400 pc reachi ...
Formation of ellipticals: Merging with or without star formation?
... ELEMENTARY prediction is ACCURATELY CONFIRMED by N-body simulations. ...
... ELEMENTARY prediction is ACCURATELY CONFIRMED by N-body simulations. ...
Identifying Young far from Giant Stars Molecular Clouds
... features to the stellar spectra. When this boundary material heats up as it accretes onto the star, it radiates, contributing its own continuum to the stellar spectrum. When the material is heated, the electrons in the layer's hydrogen atoms are excited to higher energy levels. However, the electron ...
... features to the stellar spectra. When this boundary material heats up as it accretes onto the star, it radiates, contributing its own continuum to the stellar spectrum. When the material is heated, the electrons in the layer's hydrogen atoms are excited to higher energy levels. However, the electron ...
The Recent Star Formation Histories of M81 Group Dwarf Irregular
... spans a wide range of properties including 6 magnitudes in luminosity, a factor of 1000 in current star formation rate (SFR), and 0.5 dex in metallicity (see Table 1). In Figure 1 we have highlighted the dIs from this paper (M81 Group dIs in blue and LG dIs in black) in the context of the Local Volu ...
... spans a wide range of properties including 6 magnitudes in luminosity, a factor of 1000 in current star formation rate (SFR), and 0.5 dex in metallicity (see Table 1). In Figure 1 we have highlighted the dIs from this paper (M81 Group dIs in blue and LG dIs in black) in the context of the Local Volu ...
X-rays as a branch of optics A C Nobel Lecture, December 12, 1927
... type most favorable for detecting refraction was one by Barkla 2. In this work X-rays of a wavelength which excited strongly the characteristic K-radiation from bromine were passed through a crystal of potassium bromide. The precision of his experiment was such that he was able to conclude that the ...
... type most favorable for detecting refraction was one by Barkla 2. In this work X-rays of a wavelength which excited strongly the characteristic K-radiation from bromine were passed through a crystal of potassium bromide. The precision of his experiment was such that he was able to conclude that the ...
Teachers` guide
... Aim of this educational materials The supernova explosion is used as a method to measure the distance to far galaxies. Because the supernova explosion is very violent phenomenon, we can easily detect fairly far supernova’s appearance. Also, a part of supernova explosion which is called as Type Ia ha ...
... Aim of this educational materials The supernova explosion is used as a method to measure the distance to far galaxies. Because the supernova explosion is very violent phenomenon, we can easily detect fairly far supernova’s appearance. Also, a part of supernova explosion which is called as Type Ia ha ...
Physics116_L22
... B) The image is inverted and the mirror is convex. C) The image is inverted and the mirror is concave. D) All of the previous answers can be correct. E) None of the previous answers is correct. Answer: C ...
... B) The image is inverted and the mirror is convex. C) The image is inverted and the mirror is concave. D) All of the previous answers can be correct. E) None of the previous answers is correct. Answer: C ...
Superluminal and Slow Light Propagation in a Room
... and/or low temperatures. In contrast to these techniques, we recently used a different quantum effect—coherent population oscillations—to produce a group velocity of 58 m/s at room temperature in ruby (20). Although our absorption (⬃1 cm⫺1) was higher than the absorption in the EIT experiments, it w ...
... and/or low temperatures. In contrast to these techniques, we recently used a different quantum effect—coherent population oscillations—to produce a group velocity of 58 m/s at room temperature in ruby (20). Although our absorption (⬃1 cm⫺1) was higher than the absorption in the EIT experiments, it w ...
A new low proper motion catalogue of bright M
... Low mass stars have become of interest in recent years for their applications to exoplanet research especially because of their unique properties of having short orbital periods for planets lying in the habitable zone as well as favourable contrast ratios between the planet and the host star. Though ...
... Low mass stars have become of interest in recent years for their applications to exoplanet research especially because of their unique properties of having short orbital periods for planets lying in the habitable zone as well as favourable contrast ratios between the planet and the host star. Though ...
A seismic and gravitationally-bound double star observed by Kepler
... seismic detection of such binaries would then provide an independent determination of the total mass of the system, as well as a calibration of their common stellar age. Miglio et al. (2014) predicts that about a handful of solar-like stars are detectable as seismic binaries in the Kepler data set. ...
... seismic detection of such binaries would then provide an independent determination of the total mass of the system, as well as a calibration of their common stellar age. Miglio et al. (2014) predicts that about a handful of solar-like stars are detectable as seismic binaries in the Kepler data set. ...
Star Formation in Isolated Disk Galaxies. I. Models and
... for notational convenience Rafikov (2001) defined Qs = 3.36/πQ for the stars.) In order to investigate gravitational instability in disk galaxies and consequent star formation, we model isolated galaxies with a wide range of masses. Each galaxy is composed of a dark matter halo, and a disk of stars, ...
... for notational convenience Rafikov (2001) defined Qs = 3.36/πQ for the stars.) In order to investigate gravitational instability in disk galaxies and consequent star formation, we model isolated galaxies with a wide range of masses. Each galaxy is composed of a dark matter halo, and a disk of stars, ...
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.