Slide 1
... spectrum. Ultraviolet radiation begins just past the blue/violet region of the visible (optical) spectrum, and ends when X-rays take over. The boundaries between named regions can get a little blurred, especially if the broad-band regions (example: infrared) are further broken into sub-regions (exam ...
... spectrum. Ultraviolet radiation begins just past the blue/violet region of the visible (optical) spectrum, and ends when X-rays take over. The boundaries between named regions can get a little blurred, especially if the broad-band regions (example: infrared) are further broken into sub-regions (exam ...
Telesopes
... • Astronomical objects radiate in wavelengths other than visible (thermal radiators) – Cold gas clouds – Dust clouds – Hot gases around black holes ...
... • Astronomical objects radiate in wavelengths other than visible (thermal radiators) – Cold gas clouds – Dust clouds – Hot gases around black holes ...
Astronomy 1020 Exam 4 Review Questions
... compared to the light distribution, what else can you say about the halo? How long does it take the Sun to complete one orbit about the center of the Galaxy? As such, what is the length of its galactic year? How old is the Sun in galactic years? 26. What is meant by dark matter? 27. Describe the com ...
... compared to the light distribution, what else can you say about the halo? How long does it take the Sun to complete one orbit about the center of the Galaxy? As such, what is the length of its galactic year? How old is the Sun in galactic years? 26. What is meant by dark matter? 27. Describe the com ...
The Galaxy Presentation 2011
... Very few detectable molecular clouds; virtually gas-free Lack of gas caused star formation to cease early on ...
... Very few detectable molecular clouds; virtually gas-free Lack of gas caused star formation to cease early on ...
AST1001.ch13
... • The “surface” of a black hole is the radius at which the escape velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild ...
... • The “surface” of a black hole is the radius at which the escape velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild ...
AST1001.ch13
... • The “surface” of a black hole is the radius at which the escape velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild ...
... • The “surface” of a black hole is the radius at which the escape velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild ...
neutron star - Livonia Public Schools
... All stars, regardless of their size, eventually run out of fuel and collapse due to gravity. Death of Low-Mass Stars • Stars less than one-half the mass of the sun never evolve to the red giant stage but remain in the stable main-sequence stage until they consume all their hydrogen fuel and coll ...
... All stars, regardless of their size, eventually run out of fuel and collapse due to gravity. Death of Low-Mass Stars • Stars less than one-half the mass of the sun never evolve to the red giant stage but remain in the stable main-sequence stage until they consume all their hydrogen fuel and coll ...
- IRSF: Past and Future
... In the realm of time variability studies of astrophysical phenomena, the study of transient systems over all wavelengths is becoming a major endeavour globally, with many transient detection systems now operating, some focusing on specific classes (e.g. Supernovae, Gamma Ray Bursts). High energy (X- ...
... In the realm of time variability studies of astrophysical phenomena, the study of transient systems over all wavelengths is becoming a major endeavour globally, with many transient detection systems now operating, some focusing on specific classes (e.g. Supernovae, Gamma Ray Bursts). High energy (X- ...
Chapter 19. Mapping the Universe from Herschel to Sloan
... While Cepheids are useful for getting distances to nearby galaxies it is also a painfully slow process because you need to get many images of a galaxy spread out over more than a year and discover all the Cepheids, measure their brightnesses as a function of time, etc. Fortunately, a second discover ...
... While Cepheids are useful for getting distances to nearby galaxies it is also a painfully slow process because you need to get many images of a galaxy spread out over more than a year and discover all the Cepheids, measure their brightnesses as a function of time, etc. Fortunately, a second discover ...
Lecture Eleven (Powerpoint format)
... attempting at this very moment to measure the spacetime distortion produced by gravitational radiation. The strongest conceivable sources of gravitational radiation are coalescing binary black holes and neutron stars. Even with these incredibly intense and rare events, the expected signal is min ...
... attempting at this very moment to measure the spacetime distortion produced by gravitational radiation. The strongest conceivable sources of gravitational radiation are coalescing binary black holes and neutron stars. Even with these incredibly intense and rare events, the expected signal is min ...
Integrative Studies 410 Our Place in the Universe
... • Nearby gravity becomes so strong that nothing – not even light – can escape! • The edge of the region from which nothing can escape is called the event horizon – Radius of the event horizon called the Schwarzschild ...
... • Nearby gravity becomes so strong that nothing – not even light – can escape! • The edge of the region from which nothing can escape is called the event horizon – Radius of the event horizon called the Schwarzschild ...
Lecture 12
... The light from the Andromeda galaxy left it about 1.5Myr ago, and the light from something in the Virgo Cluster about 65 Myr ago (about when the dinosaurs were killed). We’ll see we think the Universe is ~14Gyr old, so light from an object >14Glyr (5000Mpc) away will not have had enough time to reac ...
... The light from the Andromeda galaxy left it about 1.5Myr ago, and the light from something in the Virgo Cluster about 65 Myr ago (about when the dinosaurs were killed). We’ll see we think the Universe is ~14Gyr old, so light from an object >14Glyr (5000Mpc) away will not have had enough time to reac ...
Standard EPS Shell Presentation
... the early 1900s, the Danish astronomer Ejnar Hertzsprung and American astronomer Henry Russell developed an important tool for studying stars. ...
... the early 1900s, the Danish astronomer Ejnar Hertzsprung and American astronomer Henry Russell developed an important tool for studying stars. ...
Mapping the Stars
... When Stars Get Old SuperSupernovas Massive blue stars use their hydrogen much faster than stars like the sun do. Blue stars do not have long lives. What happens at the end of a blue stars life? It may explode in a large, bright flash called a supernova. What is a supernova? It is a gigantic explosi ...
... When Stars Get Old SuperSupernovas Massive blue stars use their hydrogen much faster than stars like the sun do. Blue stars do not have long lives. What happens at the end of a blue stars life? It may explode in a large, bright flash called a supernova. What is a supernova? It is a gigantic explosi ...
Cosmic Particle Accelerator - Max-Planck
... drawn about the size of the region that flared up, because no object can illuminate faster than light takes to travel across it. The region from which the gamma radiation originated must therefore be significantly smaller than the black hole with a mass of 300 million solar masses whose diameter mea ...
... drawn about the size of the region that flared up, because no object can illuminate faster than light takes to travel across it. The region from which the gamma radiation originated must therefore be significantly smaller than the black hole with a mass of 300 million solar masses whose diameter mea ...
PH607lec12
... QSOs, we have speculated on whether the centre of our galaxy might contain a black hole "Galactic Centre" here will mean the central ~10 parsecs of the Galaxy. It contains: 1. Young stars: the stellar population including evidence for star formation there in the last 50 million years or even less 2 ...
... QSOs, we have speculated on whether the centre of our galaxy might contain a black hole "Galactic Centre" here will mean the central ~10 parsecs of the Galaxy. It contains: 1. Young stars: the stellar population including evidence for star formation there in the last 50 million years or even less 2 ...
Document
... Pulsar Glitches A glitch is a discontinuous change of period. • Short timescales - pulsar slow-down rate is remarkably uniform • Longer timescales - irregularities apparent, in particular, ‘glitches’ ...
... Pulsar Glitches A glitch is a discontinuous change of period. • Short timescales - pulsar slow-down rate is remarkably uniform • Longer timescales - irregularities apparent, in particular, ‘glitches’ ...
Stars and the Milky Way
... • It is called the Milky Way because when astronomers looked up at the sky, they saw a line of light that looked like some milk had been spilt. • Stars in our Milky Way can be white, yellow or red. White stars are the hottest and red are the coolest. • It takes light over 100,000 years to travel fro ...
... • It is called the Milky Way because when astronomers looked up at the sky, they saw a line of light that looked like some milk had been spilt. • Stars in our Milky Way can be white, yellow or red. White stars are the hottest and red are the coolest. • It takes light over 100,000 years to travel fro ...
3rd EXAM VERSION A key - Department of Physics and Astronomy
... D. The immense radiation output from the quasar carries away energy. The mass of the black hole gets smaller until it evaporates. 28. Observations indicate that blazers are A. quasars that have absorbed or merged with a smaller galaxy within a cluster B. distant spiral galaxies undergoing an intense ...
... D. The immense radiation output from the quasar carries away energy. The mass of the black hole gets smaller until it evaporates. 28. Observations indicate that blazers are A. quasars that have absorbed or merged with a smaller galaxy within a cluster B. distant spiral galaxies undergoing an intense ...
Standard EPS Shell Presentation
... the early 1900s, the Danish astronomer Ejnar Hertzsprung and American astronomer Henry Russell developed an important tool for studying stars. ...
... the early 1900s, the Danish astronomer Ejnar Hertzsprung and American astronomer Henry Russell developed an important tool for studying stars. ...
Chapter 21 notes - Clinton Public Schools
... Section 5: The Expanding Universe: How the universe was formed: Astronomers believe the universe was incredibly hot and dense, exploded in what astronomers called the Big Bang. According to the big bang theory, the universe formed in an instant, billion of years ago, in an enormous explosion. Since ...
... Section 5: The Expanding Universe: How the universe was formed: Astronomers believe the universe was incredibly hot and dense, exploded in what astronomers called the Big Bang. According to the big bang theory, the universe formed in an instant, billion of years ago, in an enormous explosion. Since ...
the star
... are the dwarf ellipticals. Gas used up long ago making stars or stripped by galactic collisions and encounters. ...
... are the dwarf ellipticals. Gas used up long ago making stars or stripped by galactic collisions and encounters. ...
binary star
... Burnout and Death Death of Massive Stars • In contrast to sunlike stars, stars that are over three times the sun’s mass have relatively short life spans, which end in a supernova event. • A supernova is an exploding massive star that increases in brightness many thousands of times. • The massive s ...
... Burnout and Death Death of Massive Stars • In contrast to sunlike stars, stars that are over three times the sun’s mass have relatively short life spans, which end in a supernova event. • A supernova is an exploding massive star that increases in brightness many thousands of times. • The massive s ...
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.