www.astro.caltech.edu
... observation ended a three-decade debate comparable to the restabout the distance and energy scales of GRBs. mass of a small star converted into radiation within a few seconds. Producing so much energy so quickly essentially required the complete destruction of an entire star, and only two models wer ...
... observation ended a three-decade debate comparable to the restabout the distance and energy scales of GRBs. mass of a small star converted into radiation within a few seconds. Producing so much energy so quickly essentially required the complete destruction of an entire star, and only two models wer ...
ASTRONOMY 5
... You have traveled around a lot and it is clear that you are not in a star, yet it is nearly as bright as looking directly at the surface of the Sun. You cannot find a single neutral atom anywhere, and virtually all the nuclei are hydrogen and helium. Where are you? a) You are in the Universe when i ...
... You have traveled around a lot and it is clear that you are not in a star, yet it is nearly as bright as looking directly at the surface of the Sun. You cannot find a single neutral atom anywhere, and virtually all the nuclei are hydrogen and helium. Where are you? a) You are in the Universe when i ...
Chapter 27 Quasars, Active Galaxies, and Gamma
... • Early radio telescopes found radio emission from stars, nebulae, and some galaxies. • There were also point-like, or star-like, radio sources which varied rapidly these are the `quasi-stellar’ radio sources or quasars. • In visible light quasars appear as points, like stars. ...
... • Early radio telescopes found radio emission from stars, nebulae, and some galaxies. • There were also point-like, or star-like, radio sources which varied rapidly these are the `quasi-stellar’ radio sources or quasars. • In visible light quasars appear as points, like stars. ...
Unit 6: Space - Galena Park ISD
... Light waves have shorter wavelengths than microwaves and provide us with the visible light spectrum – the colors that we see. Most stars emit energy in visible light waves. Since the speed of light is constant, you can measure how long it takes for light to reach an object and then calculate the dis ...
... Light waves have shorter wavelengths than microwaves and provide us with the visible light spectrum – the colors that we see. Most stars emit energy in visible light waves. Since the speed of light is constant, you can measure how long it takes for light to reach an object and then calculate the dis ...
ray emission from the distant BL Lac PG 1553+113
... distribution (SED), PG 1553+113 is now classified as a highfrequency peaked BL Lac (Giommi et al. 1995), similar to essentially all of the AGN detected at VHE (very high energy; >100 GeV) energies. ...
... distribution (SED), PG 1553+113 is now classified as a highfrequency peaked BL Lac (Giommi et al. 1995), similar to essentially all of the AGN detected at VHE (very high energy; >100 GeV) energies. ...
Lecture 5
... • A thin gas in front of a cooler background produces an emission line spectrum. Downward transition of electron producing a single photon. • A thin gas in front of a hot source imprints absorption lines on the spectrum. This is mainly what we see from stars. Upward transition of electron depending ...
... • A thin gas in front of a cooler background produces an emission line spectrum. Downward transition of electron producing a single photon. • A thin gas in front of a hot source imprints absorption lines on the spectrum. This is mainly what we see from stars. Upward transition of electron depending ...
Weighing the universe—6 Dec AST207 F2010 12/6/2010
... • A Type II supernova is a massive star that explodes when it runs out of fuel and pressure is insufficient to counter gravity. • A Type I supernova is a white dwarf that explodes. – A WD and giant orbit each other. – Mass moves from the giant to the WD. – WD explodes when it gets so much mass f ...
... • A Type II supernova is a massive star that explodes when it runs out of fuel and pressure is insufficient to counter gravity. • A Type I supernova is a white dwarf that explodes. – A WD and giant orbit each other. – Mass moves from the giant to the WD. – WD explodes when it gets so much mass f ...
flare swg usa
... The large red circles denote our stepwise maximum likelihood luminosity function, ...
... The large red circles denote our stepwise maximum likelihood luminosity function, ...
PowerPoint file - Adin Community Bible Church
... rotate about the galactic center with different speeds, the inner ones rotating faster than the outer ones. The observed rotation speeds are so fast that if our galaxy were more than a few hundred million years old, it would be a featureless disc of stars instead of its present spiral shape.” ...
... rotate about the galactic center with different speeds, the inner ones rotating faster than the outer ones. The observed rotation speeds are so fast that if our galaxy were more than a few hundred million years old, it would be a featureless disc of stars instead of its present spiral shape.” ...
1. The distances to the most remote galaxies can be
... 28. The redshift of galaxies in the Universe is correctly interpreted as: a) A Doppler shift due to the motions of the galaxies through space. b) An “aging” of the light. c) Space itself is expanding with time; the wavelengths of photons are stretched while they travel through space. d) The differen ...
... 28. The redshift of galaxies in the Universe is correctly interpreted as: a) A Doppler shift due to the motions of the galaxies through space. b) An “aging” of the light. c) Space itself is expanding with time; the wavelengths of photons are stretched while they travel through space. d) The differen ...
Hubble Redshift
... attention to Cepheid Variable stars within galaxies. These stars pulsate in a characteristic fashion, which depends upon their absolute magnitude. The apparent magnitude of those stars can be measured directly. The difference between the absolute and apparent magnitude provides a method of determini ...
... attention to Cepheid Variable stars within galaxies. These stars pulsate in a characteristic fashion, which depends upon their absolute magnitude. The apparent magnitude of those stars can be measured directly. The difference between the absolute and apparent magnitude provides a method of determini ...
Redshift
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. In general, whether or not the radiation is within the visible spectrum, ""redder"" means an increase in wavelength – equivalent to a lower frequency and a lower photon energy, in accordance with, respectively, the wave and quantum theories of light.Some redshifts are an example of the Doppler effect, familiar in the change of apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles. A redshift occurs whenever a light source moves away from an observer. Another kind of redshift is cosmological redshift, which is due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase in their distance from Earth. Finally, gravitational redshift is a relativistic effect observed in electromagnetic radiation moving out of gravitational fields. Conversely, a decrease in wavelength is called blueshift and is generally seen when a light-emitting object moves toward an observer or when electromagnetic radiation moves into a gravitational field. However, redshift is a more common term and sometimes blueshift is referred to as negative redshift.Knowledge of redshifts and blueshifts has been applied to develop several terrestrial technologies such as Doppler radar and radar guns. Redshifts are also seen in the spectroscopic observations of astronomical objects. Its value is represented by the letter z.A special relativistic redshift formula (and its classical approximation) can be used to calculate the redshift of a nearby object when spacetime is flat. However, in many contexts, such as black holes and Big Bang cosmology, redshifts must be calculated using general relativity. Special relativistic, gravitational, and cosmological redshifts can be understood under the umbrella of frame transformation laws. There exist other physical processes that can lead to a shift in the frequency of electromagnetic radiation, including scattering and optical effects; however, the resulting changes are distinguishable from true redshift and are not generally referred to as such (see section on physical optics and radiative transfer).