Protogalaxies
... The first is the release of excess binding energy, since PGs have collapsed. This is true regardless of the details of mass assembly, be it hierarchical merging or a monolithic collapse. A variety of arguments suggest that the PGs collapsed by about a factor of 10. First, the mean densities of galax ...
... The first is the release of excess binding energy, since PGs have collapsed. This is true regardless of the details of mass assembly, be it hierarchical merging or a monolithic collapse. A variety of arguments suggest that the PGs collapsed by about a factor of 10. First, the mean densities of galax ...
Extragalactic Background Light Encyclopedia of Astronomy & Astrophysics eaa.iop.org Rebecca A Bernstein
... will be trapped in the cluster potential. The rate of metal production can also be traced by absorption features caused by intervening systems in quasar spectra as a function of redshift. The total metal enrichment in the universe as identified by either method agrees with the total EBL energy densi ...
... will be trapped in the cluster potential. The rate of metal production can also be traced by absorption features caused by intervening systems in quasar spectra as a function of redshift. The total metal enrichment in the universe as identified by either method agrees with the total EBL energy densi ...
Breaks in gamma-ray spectra of distant blazars and transparency of
... the mean free path of TeV gamma rays to dozens of Megaparsecs. However, TeV photons from numerous more distant sources have been detected3 . This might be interpreted, in each particular case, in terms of hardening of the emitted spectrum caused by presently unknown mechanisms at work in the sources ...
... the mean free path of TeV gamma rays to dozens of Megaparsecs. However, TeV photons from numerous more distant sources have been detected3 . This might be interpreted, in each particular case, in terms of hardening of the emitted spectrum caused by presently unknown mechanisms at work in the sources ...
Activity 8 The Doppler Effect
... Astronomers measure distances to stars in two different ways. One way is with parallax, but this method works only for the nearest stars. For all other stars astronomers apply the Doppler effect.They use the Doppler shift of spectral lines.The next-nearest galaxy is Andromeda, more than a million li ...
... Astronomers measure distances to stars in two different ways. One way is with parallax, but this method works only for the nearest stars. For all other stars astronomers apply the Doppler effect.They use the Doppler shift of spectral lines.The next-nearest galaxy is Andromeda, more than a million li ...
PH109 Exploring the Universe, Test#4, Spring 2005 Please indicate
... a. putting telescopes in space will cost approximately ten times more b. the recession of one galaxy must equal the precession of another c. the faster a galaxy moves away from us the more massive it is d. the faster a galaxy moves away from us the farther away it is 9. What type of galaxy is the An ...
... a. putting telescopes in space will cost approximately ten times more b. the recession of one galaxy must equal the precession of another c. the faster a galaxy moves away from us the more massive it is d. the faster a galaxy moves away from us the farther away it is 9. What type of galaxy is the An ...
English - Wise Observatory
... (Puerto Rico). Dr. Brosch is a member of the Oversight Committee of this survey, which is called ALFALFA. The survey measures the emission at a wavelength of 21cm produced by atoms of cosmic hydrogen. Most radio sources are identified as galaxies that emit also visible light. The hydrogen emission i ...
... (Puerto Rico). Dr. Brosch is a member of the Oversight Committee of this survey, which is called ALFALFA. The survey measures the emission at a wavelength of 21cm produced by atoms of cosmic hydrogen. Most radio sources are identified as galaxies that emit also visible light. The hydrogen emission i ...
Looking back in time to the big bang theory activity
... ICT, English skills, and presentation skills. You can also link this work to how science works. The redshift analysis task gives learners an opportunity to relate what they have learned to a real life scenario. The evidence for the Big Bang task gives learners an opportunity to voice their opinions ...
... ICT, English skills, and presentation skills. You can also link this work to how science works. The redshift analysis task gives learners an opportunity to relate what they have learned to a real life scenario. The evidence for the Big Bang task gives learners an opportunity to voice their opinions ...
The Dwarf Starburst Host Galaxy of a Type Ia SN at z= 1.55 from
... discovery of the accelerating expansion of the universe, based on just a few dozen objects (Perlmutter et al. 1999; Riess et al. 1998). Nearly 15 years later, modern SNIa samples can now include over 500 well-studied SNe with a dispersion in peak magnitudes of ∼0.16 magnitudes (e.g., Conley et al. 2 ...
... discovery of the accelerating expansion of the universe, based on just a few dozen objects (Perlmutter et al. 1999; Riess et al. 1998). Nearly 15 years later, modern SNIa samples can now include over 500 well-studied SNe with a dispersion in peak magnitudes of ∼0.16 magnitudes (e.g., Conley et al. 2 ...
SALT: a Spectral Adaptive Light curve Template for Type Ia
... where φ(p, λ, s, c) represents a benchmark supernova energy flux per unit wavelength placed at some reference distance d c/H0 from the observer, which may vary with stretch and color. The transmission T (λ) has then the dimension of an area times counts in the detector per photon. v0 is the absolu ...
... where φ(p, λ, s, c) represents a benchmark supernova energy flux per unit wavelength placed at some reference distance d c/H0 from the observer, which may vary with stretch and color. The transmission T (λ) has then the dimension of an area times counts in the detector per photon. v0 is the absolu ...
Galaxies - TeacherWeb
... • Inside a galaxy are planets, stars, and other smaller bodies in space. The planets make up solar systems in the galaxies. Solar systems have different numbers of planets, suns, stars, moons, and other matter formations. Other objects in space can include comets, meteors, meteoroids, asteroids, qua ...
... • Inside a galaxy are planets, stars, and other smaller bodies in space. The planets make up solar systems in the galaxies. Solar systems have different numbers of planets, suns, stars, moons, and other matter formations. Other objects in space can include comets, meteors, meteoroids, asteroids, qua ...
The Interstellar Medium in High Redshift Galaxies Comes of Age
... HNC, CN, H2 O, HCO+ ) and used as tracers of molecular gas. Recent observations with the Herschel Space Observatory (HSO) have shown strong spectroscopic signatures from light hydrides such as water (H2 O) and hydrogen fluoride (HF) within the Milky Way and in nearby active galaxies. The remarkable ...
... HNC, CN, H2 O, HCO+ ) and used as tracers of molecular gas. Recent observations with the Herschel Space Observatory (HSO) have shown strong spectroscopic signatures from light hydrides such as water (H2 O) and hydrogen fluoride (HF) within the Milky Way and in nearby active galaxies. The remarkable ...
W. Couch "Environment of E+A galaxies"
... •All the known rich clusters of galaxies (from the Abell, APM, Edinburgh-Durham Catalogues) within the 2dFGRS survey regions have been identified (and further studied) by De Propris et al. (2002). •The transverse separation, Dt, and the radial separation, Dr, between each E+A galaxy and these cluste ...
... •All the known rich clusters of galaxies (from the Abell, APM, Edinburgh-Durham Catalogues) within the 2dFGRS survey regions have been identified (and further studied) by De Propris et al. (2002). •The transverse separation, Dt, and the radial separation, Dr, between each E+A galaxy and these cluste ...
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).