AGN-Hubble
... means that they must be VERY far away, yet they were not too faint. Even Seyfert nuclei would not be bright enough. The energy output would have to be up to 100’s of times that from a whole normal galaxy, but the source was point-like. ...
... means that they must be VERY far away, yet they were not too faint. Even Seyfert nuclei would not be bright enough. The energy output would have to be up to 100’s of times that from a whole normal galaxy, but the source was point-like. ...
Diapositiva 1
... First extragalactic source detected in gamma-ray by AGILE-GRID, monitored simultaneously in optical band by REM telescope and in X-rays by Swift = (210 38) 10-8 ph cm-2 s-1 E > 100 MeV
...
... First extragalactic source detected in gamma-ray by AGILE-GRID, monitored simultaneously in optical band by REM telescope and in X-rays by Swift
Unit 1
... • Photons traveling away from a massive object will experience a gravitational redshift. – Their frequency will be shifted toward the red end of the ...
... • Photons traveling away from a massive object will experience a gravitational redshift. – Their frequency will be shifted toward the red end of the ...
MAGIC
... In the past: Mrk180, 1ES1011+496, S50716+714; only for S50716+714 it was possible to show that during the optical outburst the VHE gamma-ray flux was higher than in previous MAGIC observations at low optical state. Also 3C279 observations were triggered by high optical state, also some not-optically ...
... In the past: Mrk180, 1ES1011+496, S50716+714; only for S50716+714 it was possible to show that during the optical outburst the VHE gamma-ray flux was higher than in previous MAGIC observations at low optical state. Also 3C279 observations were triggered by high optical state, also some not-optically ...
Background Science - Faulkes Telescope Project
... the X-ray, we are looking at the parts of the shell that are much hotter than the areas shining in the optical. The X-rays come from the extremely hot material at around 10 million degrees Kelvin. These high energy rays are emitted from the chemical elements in the gas, for example, from silicon, ir ...
... the X-ray, we are looking at the parts of the shell that are much hotter than the areas shining in the optical. The X-rays come from the extremely hot material at around 10 million degrees Kelvin. These high energy rays are emitted from the chemical elements in the gas, for example, from silicon, ir ...
Practice Questions for Final
... B. A spaceship passing near a 10 solar mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar mass mainsequence star. C. If you watch someone else fall into a black hole, you will never see them cross the event horizon. However ...
... B. A spaceship passing near a 10 solar mass black hole is much more likely to be destroyed than a spaceship passing at the same distance from the center of a 10 solar mass mainsequence star. C. If you watch someone else fall into a black hole, you will never see them cross the event horizon. However ...
Goals of the day Clickers Order of Magnitude Astronomy
... the Andromeda galaxy (the other big galaxy in the local group). The remnants from such explosions disperse in about 10,000 years. A. The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B. In reality, the supernova remnant has already dispersed, b ...
... the Andromeda galaxy (the other big galaxy in the local group). The remnants from such explosions disperse in about 10,000 years. A. The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B. In reality, the supernova remnant has already dispersed, b ...
Physics Observing The Universe
... Pulsars are highly magnetized neutron stars that emit a beam of e/m radiation. They rotate very rapidly. e,.g once every 1.4 milliseconds to 8.5 seconds. The radiation can only be observed when the beam of emission is pointing towards Earth. This is called the lighthouse effect and gives rise to the ...
... Pulsars are highly magnetized neutron stars that emit a beam of e/m radiation. They rotate very rapidly. e,.g once every 1.4 milliseconds to 8.5 seconds. The radiation can only be observed when the beam of emission is pointing towards Earth. This is called the lighthouse effect and gives rise to the ...
Goals of the day Clickers Order of Magnitude Astronomy
... the Andromeda galaxy (the other big galaxy in the local group). The remnants from such explosions disperse in about 10,000 years. A. The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B. In reality, the supernova remnant has already dispersed, b ...
... the Andromeda galaxy (the other big galaxy in the local group). The remnants from such explosions disperse in about 10,000 years. A. The supernova remnant still exists now, and we will watch it disperse over the next 10,000 Earth years. B. In reality, the supernova remnant has already dispersed, b ...
AS 60 - Astronomy of the Americas
... Astronomy 4 - Introduction to Astronomy Module 8 Quiz 1. If you take a spectrum of a galaxy, what type of spectrum will you observe? a. b. c. d. ...
... Astronomy 4 - Introduction to Astronomy Module 8 Quiz 1. If you take a spectrum of a galaxy, what type of spectrum will you observe? a. b. c. d. ...
Galaxies
... The Milky Way • The gas and dust limits our view to about 6000 light years • Much of this gas and dust can be observed in the form of nebulae • A nebula is a cloud of gas seen in visible light • How the gas is seen depends on the stars around it ...
... The Milky Way • The gas and dust limits our view to about 6000 light years • Much of this gas and dust can be observed in the form of nebulae • A nebula is a cloud of gas seen in visible light • How the gas is seen depends on the stars around it ...
Sources of Gravitational Waves Peter Shawhan
... Generally magnetized, sometimes very strongly A small fraction of neutron stars are seen as pulsars ...
... Generally magnetized, sometimes very strongly A small fraction of neutron stars are seen as pulsars ...
solar.gmu.edu
... •Even though small, the luminosity of a quasar (1038 to 1042 Watts) can be very larger, i.e., several thousand times more than the entire Milly Way Galaxies (1037). •A quasar has emission spectrum, not the absorption spectrum of ordinary stars or galaxies. •We now know that about 10% of all qauasars ...
... •Even though small, the luminosity of a quasar (1038 to 1042 Watts) can be very larger, i.e., several thousand times more than the entire Milly Way Galaxies (1037). •A quasar has emission spectrum, not the absorption spectrum of ordinary stars or galaxies. •We now know that about 10% of all qauasars ...
Big bang galaxies stars Name: Date: 1. The diagram below
... A major piece of scienti c evidence supporting this theory is the fact that wavelengths of light from galaxies moving away from Earth in stage 3 are observed to be A. ...
... A major piece of scienti c evidence supporting this theory is the fact that wavelengths of light from galaxies moving away from Earth in stage 3 are observed to be A. ...
Measuring the Masses of Galaxies in the Sloan Digital Sky Survey
... y-axis is the flux per Ångstrom gif image is smoothed/compressed ...
... y-axis is the flux per Ångstrom gif image is smoothed/compressed ...
Test #4
... b) Their spectra are like those produced by ordinary stars. c) They vary on rapid time scales. d) They can be seen clearly; we can see that the energy source is compact. 8. Why are quasars called “quasi-stellar”? a) Their spectra strongly resemble the spectra of stars. b) They are ordinary stars loc ...
... b) Their spectra are like those produced by ordinary stars. c) They vary on rapid time scales. d) They can be seen clearly; we can see that the energy source is compact. 8. Why are quasars called “quasi-stellar”? a) Their spectra strongly resemble the spectra of stars. b) They are ordinary stars loc ...
Global Telescope Network - XMM-Newton
... By creating and circulating the heavier elements from which planets and life are made By compressing clouds of gas and dust to initiate the process of forming new stars ...
... By creating and circulating the heavier elements from which planets and life are made By compressing clouds of gas and dust to initiate the process of forming new stars ...
Test 3 Version 3 1. Milky Way halo stars follow: (a) differential
... 1. Milky Way halo stars follow: (a) differential rotation, (b) solid disk rotation, (c) randomly inclined elliptical orbits, (d) randomly inclined circular orbits. 2. Which of the following is false: The Milky Way is (a) diffuse band of light across the sky, (b) a spiral galaxy, (c) the galaxy the s ...
... 1. Milky Way halo stars follow: (a) differential rotation, (b) solid disk rotation, (c) randomly inclined elliptical orbits, (d) randomly inclined circular orbits. 2. Which of the following is false: The Milky Way is (a) diffuse band of light across the sky, (b) a spiral galaxy, (c) the galaxy the s ...
Part II: Ideas in Conflict.
... luminous its redshift indicates it is 4 billion light years away!! ...
... luminous its redshift indicates it is 4 billion light years away!! ...
Chapter 28 – Stars and Galaxies
... 1. The actual brightness of the star is luminosity 2. If two stars have the same surface temperature, the larger star would be more luminous 3. If the same size, hotter one would be brighter 4. Types of magnitude a. Absolute – as if all stars were same distance from earth b. Apparent – as they appea ...
... 1. The actual brightness of the star is luminosity 2. If two stars have the same surface temperature, the larger star would be more luminous 3. If the same size, hotter one would be brighter 4. Types of magnitude a. Absolute – as if all stars were same distance from earth b. Apparent – as they appea ...
c - Fsusd
... 4) The planets and moons in our solar system are visible because they ______. a) emit their own light b) undergo nuclear fusion c) absorb light from the sun d) reflect light from the sun ...
... 4) The planets and moons in our solar system are visible because they ______. a) emit their own light b) undergo nuclear fusion c) absorb light from the sun d) reflect light from the sun ...
Gamma-ray burst
Gamma-ray bursts (GRBs) are flashes of gamma rays associated with extremely energetic explosions that have been observed in distant galaxies. They are the brightest electromagnetic events known to occur in the universe. Bursts can last from ten milliseconds to several hours. The initial burst is usually followed by a longer-lived ""afterglow"" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, microwave and radio).Most observed GRBs are believed to consist of a narrow beam of intense radiation released during a supernova or hypernova as a rapidly rotating, high-mass star collapses to form a neutron star, quark star, or black hole. A subclass of GRBs (the ""short"" bursts) appear to originate from a different process – this may be due to the merger of binary neutron stars. The cause of the precursor burst observed in some of these short events may be due to the development of a resonance between the crust and core of such stars as a result of the massive tidal forces experienced in the seconds leading up to their collision, causing the entire crust of the star to shatter.The sources of most GRBs are billions of light years away from Earth, implying that the explosions are both extremely energetic (a typical burst releases as much energy in a few seconds as the Sun will in its entire 10-billion-year lifetime) and extremely rare (a few per galaxy per million years). All observed GRBs have originated from outside the Milky Way galaxy, although a related class of phenomena, soft gamma repeater flares, are associated with magnetars within the Milky Way. It has been hypothesized that a gamma-ray burst in the Milky Way, pointing directly towards the Earth, could cause a mass extinction event.GRBs were first detected in 1967 by the Vela satellites, a series of satellites designed to detect covert nuclear weapons tests. Hundreds of theoretical models were proposed to explain these bursts in the years following their discovery, such as collisions between comets and neutron stars. Little information was available to verify these models until the 1997 detection of the first X-ray and optical afterglows and direct measurement of their redshifts using optical spectroscopy, and thus their distances and energy outputs. These discoveries, and subsequent studies of the galaxies and supernovae associated with the bursts, clarified the distance and luminosity of GRBs. These facts definitively placed them in distant galaxies and also connected long GRBs with the explosion of massive stars, the only possible source for the energy outputs observed.