White Dwarfs - University of Maryland Astronomy
... It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~ 3 MSun). ...
... It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~ 3 MSun). ...
Announcements Evolution of High-Mass Stars: Red Supergiants
... • To map the Milky Way Galaxy, we need to measure distances to stars. • Parallax only works for nearby stars (within about 1000 light years) • For more distant stars, we use Standard Candles Car Headlights are standard candles: We use them to determine the car’s distance ...
... • To map the Milky Way Galaxy, we need to measure distances to stars. • Parallax only works for nearby stars (within about 1000 light years) • For more distant stars, we use Standard Candles Car Headlights are standard candles: We use them to determine the car’s distance ...
Lecture 18, Gravitational Waves, Future Missions and
... energy, but also galaxy evolution, map the Milky Way. Pan-STARRs and LSST will also provide the first large (and deep) surveys for optical transients. Transient sources include: - Supernovae and GRBs - gravitational lens variability - AGN and blazars - microlensing events - variable stars - possibly ...
... energy, but also galaxy evolution, map the Milky Way. Pan-STARRs and LSST will also provide the first large (and deep) surveys for optical transients. Transient sources include: - Supernovae and GRBs - gravitational lens variability - AGN and blazars - microlensing events - variable stars - possibly ...
How many stars are in the Milky Way Galaxy?
... • The center of this distribution shows the location of the galactic center. ...
... • The center of this distribution shows the location of the galactic center. ...
powerpoint file
... The surface gravity is so high that a 150 pound person would weigh a million tons. You would be squeezed flatter than a piece of paper. The fastest pulsar known has a period of 0.0014 s. The star spins 642 times per second. Dozens of such “millisecond pulsars” are known. More are being discovered. I ...
... The surface gravity is so high that a 150 pound person would weigh a million tons. You would be squeezed flatter than a piece of paper. The fastest pulsar known has a period of 0.0014 s. The star spins 642 times per second. Dozens of such “millisecond pulsars” are known. More are being discovered. I ...
Correct answers shown in boldface. Be sure to write your name and
... b. causes the cluster to glow all over as things fall into it c. makes the emission lines of the galaxies in the cluster shift wavelength significantly due to relativity d. is almost all concentrated in its giant central galaxies e. is mostly in the form of very hot gas and dark matter 32. Why did a ...
... b. causes the cluster to glow all over as things fall into it c. makes the emission lines of the galaxies in the cluster shift wavelength significantly due to relativity d. is almost all concentrated in its giant central galaxies e. is mostly in the form of very hot gas and dark matter 32. Why did a ...
Stars: Their Life and Afterlife
... not only tend to form close together in space, but also in time – and so, for massive stars, they will also die relatively close together in space and time. Superbubbles form from OB associations. OB associations are clusters of massive stars of spectral types – you guessed it – O and B. • O stars a ...
... not only tend to form close together in space, but also in time – and so, for massive stars, they will also die relatively close together in space and time. Superbubbles form from OB associations. OB associations are clusters of massive stars of spectral types – you guessed it – O and B. • O stars a ...
No Slide Title
... 7-11.Crab Nebula-In 1054 AD the chinese recorded a bright new star seen in daylight for quite a long time.It was a Supernova and we see the remnants in these pictures.The first four show it as seen in four different regions of the electromagnetic spectrum[UV,visible,IR,X-ray].The final picture shows ...
... 7-11.Crab Nebula-In 1054 AD the chinese recorded a bright new star seen in daylight for quite a long time.It was a Supernova and we see the remnants in these pictures.The first four show it as seen in four different regions of the electromagnetic spectrum[UV,visible,IR,X-ray].The final picture shows ...
Handout from Allaire Star Party
... Earth would be about the size of a pea. If you placed the beach ball on one goal line of a football field, the Earth would be at about the fifty-yard line. Pluto would be about 20 football fields away from the Sun. How far away are the closest stars? Imagine now that the Sun is shrunk even further, ...
... Earth would be about the size of a pea. If you placed the beach ball on one goal line of a football field, the Earth would be at about the fifty-yard line. Pluto would be about 20 football fields away from the Sun. How far away are the closest stars? Imagine now that the Sun is shrunk even further, ...
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 ...
Great Observatories
... • Unique access to optical/UV range • Plan on table to fly 2.4m mirror with existing HST instruments (Hubble Origins Probe or HOP); could be as low as $250M. • Need to decide who gets the instruments! ...
... • Unique access to optical/UV range • Plan on table to fly 2.4m mirror with existing HST instruments (Hubble Origins Probe or HOP); could be as low as $250M. • Need to decide who gets the instruments! ...
Stellar Evolution - Hays High Indians
... • Star’s color is related to its temperature • Spectral lines reveal which elements are in the stars ...
... • Star’s color is related to its temperature • Spectral lines reveal which elements are in the stars ...
Big Bang Theory Project
... Spectroscope: Used to identify celestial bodies in distant galaxies. ...
... Spectroscope: Used to identify celestial bodies in distant galaxies. ...
ppt
... Hubble could only find Cepheids in the closest few galaxies (1-2 Mpc). Even Hubble Space Telescope cannot find Cepheids beyond the Virgo cluster (16 Mpc). Beyond 1-2Mpc, Hubble used… ...
... Hubble could only find Cepheids in the closest few galaxies (1-2 Mpc). Even Hubble Space Telescope cannot find Cepheids beyond the Virgo cluster (16 Mpc). Beyond 1-2Mpc, Hubble used… ...
Test 1 - Brock physics
... (a) yellow, because they emit a significant amount of yellow electromagnetic radiation. (b) blue, because they emit a significant amount of blue and ultraviolet electromagnetic radiation. (c) red, because electrons recombine with protons and then make transitions to lower energy levels, emitting red ...
... (a) yellow, because they emit a significant amount of yellow electromagnetic radiation. (b) blue, because they emit a significant amount of blue and ultraviolet electromagnetic radiation. (c) red, because electrons recombine with protons and then make transitions to lower energy levels, emitting red ...
Star and Galaxies
... • 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 star’s interior condenses and may produce a ...
... • 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 star’s interior condenses and may produce a ...
Volcanoes and Igneous Activity Earth
... • 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 star’s interior condenses and may produce a ...
... • 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 star’s interior condenses and may produce a ...
Death by Black Hole Study Guide-Answers - crespiphysics
... 1. In 1932 Karl Jansky recorded radio signals from the center of the Milky Way Galaxy. What was historic about his discovery? First radio signals that weren’t from earth 2. What is a quasar? Quasi-stellar radio source; some of the most distant objects in universe 3. Why do galaxies with a lot of gas ...
... 1. In 1932 Karl Jansky recorded radio signals from the center of the Milky Way Galaxy. What was historic about his discovery? First radio signals that weren’t from earth 2. What is a quasar? Quasi-stellar radio source; some of the most distant objects in universe 3. Why do galaxies with a lot of gas ...
PH607lec10
... clear possibility and is supported by evidence of the newly discovered Outer Arm extension of the Cygnus Arm. 2. Interaction. With the discovery of the Sagittarius Dwarf Elliptical Galaxy in 1994 came the discovery of a ribbon of galactic debris as the polar orbit of Sagittarius and its interaction ...
... clear possibility and is supported by evidence of the newly discovered Outer Arm extension of the Cygnus Arm. 2. Interaction. With the discovery of the Sagittarius Dwarf Elliptical Galaxy in 1994 came the discovery of a ribbon of galactic debris as the polar orbit of Sagittarius and its interaction ...
PHYSICS 1500 - ASTRONOMY TOTAL: 100 marks Section A Please
... Why does the disk of our galaxy appear blue? (a) all the red starlight is scattered out of our view. (b) the blue light is recombination radiation from HII regions. (c) the blue light is emission from elements in the interstellar medium heavier than hydrogen. (d) it is illuminated by the Magellanic ...
... Why does the disk of our galaxy appear blue? (a) all the red starlight is scattered out of our view. (b) the blue light is recombination radiation from HII regions. (c) the blue light is emission from elements in the interstellar medium heavier than hydrogen. (d) it is illuminated by the Magellanic ...
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.