Lecture 7: Light Waves Newton`s Laws of Motion (1666) Newton`s
... Wave Nature of Radiation •Visible light is part of the electromagnetic radiation spectrum •Why electromagnetic? Because the radiation contains ...
... Wave Nature of Radiation •Visible light is part of the electromagnetic radiation spectrum •Why electromagnetic? Because the radiation contains ...
Doppler Shift - El Camino College
... spectrum of light it gives off. Recall that the spectrum of an object contains lines that work like fingerprints to help identify different elements. Since the lines of a spectrum occur at specific wavelengths we can determine that an object is moving when we see that the lines have been shifted to ...
... spectrum of light it gives off. Recall that the spectrum of an object contains lines that work like fingerprints to help identify different elements. Since the lines of a spectrum occur at specific wavelengths we can determine that an object is moving when we see that the lines have been shifted to ...
relativistic time correction on movement of distant galaxies
... distance of 13.4 billion light years from Earth. That means, light that we have just received is giving information about 13.4 billion years old. This galaxy is reported to be containing stars. Suppose there is a Sun like star of about 5 billion years old, then that star was formed at about 13.4+5=1 ...
... distance of 13.4 billion light years from Earth. That means, light that we have just received is giving information about 13.4 billion years old. This galaxy is reported to be containing stars. Suppose there is a Sun like star of about 5 billion years old, then that star was formed at about 13.4+5=1 ...
Olbers` Paradox
... years old (the latest figure) are too far away for their light ever to reach us. • Redshift effect certainly contributes. But the finite age of the Universe is the most important effect. ...
... years old (the latest figure) are too far away for their light ever to reach us. • Redshift effect certainly contributes. But the finite age of the Universe is the most important effect. ...
Quasars and Active Galaxies
... • “Steady State”: As galaxies move apart from each other, new atoms are spontaneously created in empty space. These atoms coalesce to form new galaxies. The average density of the universe doesn’t change over time. There was no hot early universe. Quasars were the first evidence that the universe wa ...
... • “Steady State”: As galaxies move apart from each other, new atoms are spontaneously created in empty space. These atoms coalesce to form new galaxies. The average density of the universe doesn’t change over time. There was no hot early universe. Quasars were the first evidence that the universe wa ...
Other galaxies, the expansion of the universe
... the Coma cluster must contain much more mass than could be identified in stars and gas. He attributed this to some form of mysterious dark matter. Other astronomers ignored these findings until the 1970's when Vera Rubin found evidence for dark matter in many individual galaxies. ...
... the Coma cluster must contain much more mass than could be identified in stars and gas. He attributed this to some form of mysterious dark matter. Other astronomers ignored these findings until the 1970's when Vera Rubin found evidence for dark matter in many individual galaxies. ...
Test 1 Earth Science 1) According to the big bang timeline , as the
... small increase in the total numbers. Cellphones give off a form of radiation known as nonionizing radiation. The frequencies associated with this form of electromagnetic radiation are too low and the signal is too weak to be able to break biochemical bonds within body tissues and to be able to dama ...
... small increase in the total numbers. Cellphones give off a form of radiation known as nonionizing radiation. The frequencies associated with this form of electromagnetic radiation are too low and the signal is too weak to be able to break biochemical bonds within body tissues and to be able to dama ...
L. Moustakas
... For a ~Salpeter IMF, and star formation rates somewhat above a few Msun/yr, there is a tight relation between SFR and LX, which arises from high-mass Xray binaries and supernovae. ...
... For a ~Salpeter IMF, and star formation rates somewhat above a few Msun/yr, there is a tight relation between SFR and LX, which arises from high-mass Xray binaries and supernovae. ...
sBzKs
... while at z～2 actively star forming (sBzKs) and passive (pBzKs) galaxies exist in similar numbers, and most massive galaxies tend to be the most actively star forming galaxies. • This can be seen as yet another manifestation of the downsizing effect, with massive galaxies completing their star format ...
... while at z～2 actively star forming (sBzKs) and passive (pBzKs) galaxies exist in similar numbers, and most massive galaxies tend to be the most actively star forming galaxies. • This can be seen as yet another manifestation of the downsizing effect, with massive galaxies completing their star format ...
Our Universe (ES1-E) I know that our Sun is one of hundreds of
... years. • Believed to be a _________ ________ galaxy. • It is about __________ light years across and _________ light years from top to bottom. ...
... years. • Believed to be a _________ ________ galaxy. • It is about __________ light years across and _________ light years from top to bottom. ...
Messing Up a Galaxy
... It's interesting to note how astronomers know the difference — but there is a telltale observation that they can make. The largest of these clumps of material is the dwarf galaxy that has been named NGC 5291N. If this were a primitive dwarf galaxy from the early history of the Universe, it would con ...
... It's interesting to note how astronomers know the difference — but there is a telltale observation that they can make. The largest of these clumps of material is the dwarf galaxy that has been named NGC 5291N. If this were a primitive dwarf galaxy from the early history of the Universe, it would con ...
The End of the Dark Ages
... 1 shows a comparison between the final stages (100 Myr after the source turn on) of the I-front evolution for a Larson (upper panel) and a Salpeter (bottom) IMF. The source stellar mass and other properties of the simulations are the same as those discussed above. For a Salpeter IMF, the volume of t ...
... 1 shows a comparison between the final stages (100 Myr after the source turn on) of the I-front evolution for a Larson (upper panel) and a Salpeter (bottom) IMF. The source stellar mass and other properties of the simulations are the same as those discussed above. For a Salpeter IMF, the volume of t ...
The Big Bang Theory - Warren County Schools
... A crucial moment in the creation of the universe was when the atoms that were present became neutral and the radiation was able to flow through it and expand with the universe. This allowed matter to begin clumping to form the structures we observe in the universe. ...
... A crucial moment in the creation of the universe was when the atoms that were present became neutral and the radiation was able to flow through it and expand with the universe. This allowed matter to begin clumping to form the structures we observe in the universe. ...
Molecular gas in z~6 quasar host galaxies
... and some nearby starburst galaxies (eg. M82, Weiss et al. ...
... and some nearby starburst galaxies (eg. M82, Weiss et al. ...
Supplemental Educational Support Materials
... • Are there galaxies in the picture we cannot see? • How many galaxies are in the picture? ...
... • Are there galaxies in the picture we cannot see? • How many galaxies are in the picture? ...
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).