Fermi Fact Sheet - Fermi Gamma-ray Space Telescope
... when mysterious dark matter particles collide and annihilate each other. Exotic and surreal though it may seem to some, this is the extreme universe of high-energy astrophysics. We are now peering into the heart of this cosmic landscape with the Fermi Gamma-ray Space Telescope. An advance in space-s ...
... when mysterious dark matter particles collide and annihilate each other. Exotic and surreal though it may seem to some, this is the extreme universe of high-energy astrophysics. We are now peering into the heart of this cosmic landscape with the Fermi Gamma-ray Space Telescope. An advance in space-s ...
Microsoft Word Document
... 5. Since most stars orbit in pairs, if one of the stars is a white dwarf, it can steal material from the other star and explode as a Type _____ supernova. ...
... 5. Since most stars orbit in pairs, if one of the stars is a white dwarf, it can steal material from the other star and explode as a Type _____ supernova. ...
1. Compute the deflection angle of a star whose light... limb of the Sun. Also compute the deflection angle of...
... 1. Compute the deflection angle of a star whose light just grazes the limb of the Sun. Also compute the deflection angle of a star whose light just grazes the limb of a 1.4M neutron star, if the neutron star was at the same distance from the Earth as the Sun. State assumptions. 2. Use the Plummer p ...
... 1. Compute the deflection angle of a star whose light just grazes the limb of the Sun. Also compute the deflection angle of a star whose light just grazes the limb of a 1.4M neutron star, if the neutron star was at the same distance from the Earth as the Sun. State assumptions. 2. Use the Plummer p ...
General Astrophysical Concepts: Astronomical length scales
... nucleus of a quasar is about five million times the mass of our Sun The light-emitting region of a typical quasar is comparable in size to our Solar System Quasars and AGNs can be 100 to 1000 times more luminous than our Milky Way galaxy Most galaxies have massive black holes at their centers ...
... nucleus of a quasar is about five million times the mass of our Sun The light-emitting region of a typical quasar is comparable in size to our Solar System Quasars and AGNs can be 100 to 1000 times more luminous than our Milky Way galaxy Most galaxies have massive black holes at their centers ...
doc - University of Texas Astronomy
... Italian-Dutch BeppoSAX satellite) to see the xray “afterglow” from a gamma ray burst to locate its position in the sky more accurately, and then see spectral lines in its optical “afterglow.” The resulting Doppler shift was a redshift and it was enormous. As we’ll see later, because the universe is ...
... Italian-Dutch BeppoSAX satellite) to see the xray “afterglow” from a gamma ray burst to locate its position in the sky more accurately, and then see spectral lines in its optical “afterglow.” The resulting Doppler shift was a redshift and it was enormous. As we’ll see later, because the universe is ...
Transparencies - Rencontres de Moriond
... Who is the progenitor ? The observations of GRB afterglows shown that the bursts with an optical counterpart are localized in the stars formation regions of far galaxies, and that the energy released is between 1051 and 1054 erg if the emission has spherical symmetry. Two families of progenitor coul ...
... Who is the progenitor ? The observations of GRB afterglows shown that the bursts with an optical counterpart are localized in the stars formation regions of far galaxies, and that the energy released is between 1051 and 1054 erg if the emission has spherical symmetry. Two families of progenitor coul ...
High Energy Emission from GRBs HAWC
... What are GRBs? • Cosmological distance • Typical observed z>1 ...
... What are GRBs? • Cosmological distance • Typical observed z>1 ...
Event-Sequence Time Series Analysis for Very
... Blazars constitute the primary class of extragalactic very-high energy (VHE) emitters in the sky and are among some of the brightest and most variable sources in the TeVs. Recently, extreme variability episodes have been detected by ground-based gamma-ray facilities – such as the two large outbursts ...
... Blazars constitute the primary class of extragalactic very-high energy (VHE) emitters in the sky and are among some of the brightest and most variable sources in the TeVs. Recently, extreme variability episodes have been detected by ground-based gamma-ray facilities – such as the two large outbursts ...
AST301.Ch22.NeutGammBH - University of Texas Astronomy
... Fig.22.13) flashes of gamma ray light. Until about 1995, no one knew what they could be or where located—solar system? Nearby stellar event flare? Need distance to get brightness (luminosity). First indication: they are distributed isotropically in the sky (no preferred direction, like the plane of ...
... Fig.22.13) flashes of gamma ray light. Until about 1995, no one knew what they could be or where located—solar system? Nearby stellar event flare? Need distance to get brightness (luminosity). First indication: they are distributed isotropically in the sky (no preferred direction, like the plane of ...
Life Cycles of Stars
... megatons/second • Let’s relate that to human scales. What would that be at one kilometer distance? • 77 x 1015 tons/(150 x 106km)2 = 3 tons • Picture a truckload of explosives a km away giving off a one-second burst of heat and light to rival the Sun ...
... megatons/second • Let’s relate that to human scales. What would that be at one kilometer distance? • 77 x 1015 tons/(150 x 106km)2 = 3 tons • Picture a truckload of explosives a km away giving off a one-second burst of heat and light to rival the Sun ...
Review 1 Solutions
... Io has a younger surface than Callisto. From other observations, we know this is because of volcanic activity on Io that constantly replenishes its surface with lava. 8. During what lunar phases are tides on Earth the most exaggerated? Tides are exaggerated during full moon and new moon, when the su ...
... Io has a younger surface than Callisto. From other observations, we know this is because of volcanic activity on Io that constantly replenishes its surface with lava. 8. During what lunar phases are tides on Earth the most exaggerated? Tides are exaggerated during full moon and new moon, when the su ...
Dark Matter Search
... core collapse supernova, with relativistic jets that can produce long GRBs LAT (>1MeV) 31 GeV 0.83 s Constraints on the quantum gravity mass scale (MQG) by direct measurement of photon arrival times, testing Lorentz Compact Merger: Two neutron invariance violation. stars, or a neutron star and a bla ...
... core collapse supernova, with relativistic jets that can produce long GRBs LAT (>1MeV) 31 GeV 0.83 s Constraints on the quantum gravity mass scale (MQG) by direct measurement of photon arrival times, testing Lorentz Compact Merger: Two neutron invariance violation. stars, or a neutron star and a bla ...
Study Guide_galaxies, Tools, and Stars Test
... 3. What is the name of the galaxy our solar system is located in? 4. What type of galaxy is the Milky Way galaxy? 5. The ________ is the largest star in our solar system. 6. Name and describe the 3 types of galaxies. 7. Where is our solar system located in the Milky Way galaxy? 8. What is a light ye ...
... 3. What is the name of the galaxy our solar system is located in? 4. What type of galaxy is the Milky Way galaxy? 5. The ________ is the largest star in our solar system. 6. Name and describe the 3 types of galaxies. 7. Where is our solar system located in the Milky Way galaxy? 8. What is a light ye ...
Overview and first year observation of CALET Gamma ray Burst
... A gamma ray burst (GRB) is a mysterious explosion in the universe. A prompt emission, an explosive main emission of GRBs, is very bright and variable. Although the mechanism of a prompt emission is not well understood, a cogent scenario is the internal shock model. That is collisions between each ej ...
... A gamma ray burst (GRB) is a mysterious explosion in the universe. A prompt emission, an explosive main emission of GRBs, is very bright and variable. Although the mechanism of a prompt emission is not well understood, a cogent scenario is the internal shock model. That is collisions between each ej ...
Notes
... Black Holes: Accreted matter___________________ beyond the event horizon without a trace Neutron Stars: Accreted matter produces _____________________________ as it impacts on the neutron star surface VII Black Hole X-Ray Binaries Accretion disks around black holes are strong _________________ ...
... Black Holes: Accreted matter___________________ beyond the event horizon without a trace Neutron Stars: Accreted matter produces _____________________________ as it impacts on the neutron star surface VII Black Hole X-Ray Binaries Accretion disks around black holes are strong _________________ ...
Supernovae Gamma-Ray Bursts and and some of their uses
... Type Ia Supernovae Identification of Type Ia supernovae with exploding white dwarfs is circumstantial but strong. Main clues are: • No H lines but presence of Si lines in absorption At most ~ 0.1 Solar masses of H in vicinity Nuclear burning all the way to Si must occur • Observed in elliptical gal ...
... Type Ia Supernovae Identification of Type Ia supernovae with exploding white dwarfs is circumstantial but strong. Main clues are: • No H lines but presence of Si lines in absorption At most ~ 0.1 Solar masses of H in vicinity Nuclear burning all the way to Si must occur • Observed in elliptical gal ...
The Mystery of Gamma Ray Bursts
... gamma rays - this could account for some of the variation in shapes observed in the light curves (Imagineweb). A GRB afterglow (980425) was first linked to a supernova (1998bw) in 1998. Then in 2003, GRB 030329 had an optical and X-ray spectrograph almost identical to the supernova that created it, ...
... gamma rays - this could account for some of the variation in shapes observed in the light curves (Imagineweb). A GRB afterglow (980425) was first linked to a supernova (1998bw) in 1998. Then in 2003, GRB 030329 had an optical and X-ray spectrograph almost identical to the supernova that created it, ...
GammaRay Bursts, the Strongest Explosions in the Universe.
... relativistic jet can punch a hole in the collapsing stellar envelope and produce a GRB. According to this idea the collapsing star forms in its center a black hole surrounded by a massive ...
... relativistic jet can punch a hole in the collapsing stellar envelope and produce a GRB. According to this idea the collapsing star forms in its center a black hole surrounded by a massive ...
GRB Effects
... We don’t know when it will blow– today or in a million years. It might be a hypernova, or GRB, but maybe not. Regardless, the current orientation of the star (note, the lobes) suggests that it will miss the Earth. ...
... We don’t know when it will blow– today or in a million years. It might be a hypernova, or GRB, but maybe not. Regardless, the current orientation of the star (note, the lobes) suggests that it will miss the Earth. ...
Astronomy Quiz #1 Answers
... 7. What are the two important discoveries made by Edwin Hubble? -many galaxies existed beyond the Milky Way -almost all galaxies are moving away from each other ...
... 7. What are the two important discoveries made by Edwin Hubble? -many galaxies existed beyond the Milky Way -almost all galaxies are moving away from each other ...
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.