Jeopardy Questions
... Q: Name 3 pieces of evidence for dark matter A: X-ray observations of hot gas in galaxy clusters, gravitational lensing from galaxy clusters, flat rotation curves of spiral galaxies ...
... Q: Name 3 pieces of evidence for dark matter A: X-ray observations of hot gas in galaxy clusters, gravitational lensing from galaxy clusters, flat rotation curves of spiral galaxies ...
ONLINE practice exam
... 2. A supernova goes off in a galaxy whose cosmological redshift is z =0.2. From its maximum brightness, astronomers determine that it is located at a distance of 1000 Mpc. (a) What is the observed wavelength of the HI spectral line from this galaxy? (The rest wavelength is 21.1cm) (b) Use this info ...
... 2. A supernova goes off in a galaxy whose cosmological redshift is z =0.2. From its maximum brightness, astronomers determine that it is located at a distance of 1000 Mpc. (a) What is the observed wavelength of the HI spectral line from this galaxy? (The rest wavelength is 21.1cm) (b) Use this info ...
burrows_liverpool2012
... • Extremely variable compared to GRBs – Periodicity: no coherent periodicity found (hints of periodic dips at 2.5-3σ; Burrows+11, Saxton+12) – Dips are dominated by changes in flux normalization – Dips: long term p-p variability by 10x • jet precession? Possibly warped disk around rapidly spinning B ...
... • Extremely variable compared to GRBs – Periodicity: no coherent periodicity found (hints of periodic dips at 2.5-3σ; Burrows+11, Saxton+12) – Dips are dominated by changes in flux normalization – Dips: long term p-p variability by 10x • jet precession? Possibly warped disk around rapidly spinning B ...
PowerPoint Presentation - Brighter Than a Trillion Suns
... produce pulsars, jets and gamma-ray bursts Relativity theory is needed for full understanding, but … ...
... produce pulsars, jets and gamma-ray bursts Relativity theory is needed for full understanding, but … ...
Name____________________________________________
... S6E1 Where do we live in the Universe, Milky Way, and our Solar System? 1. Between 15-20 billion years ago the Universe began expanding out of an enormous explosion scientist called the Big Bang theory. 2. From largest to smallest, order the following (1 is largest -4 is smallest): __4___ The Sun __ ...
... S6E1 Where do we live in the Universe, Milky Way, and our Solar System? 1. Between 15-20 billion years ago the Universe began expanding out of an enormous explosion scientist called the Big Bang theory. 2. From largest to smallest, order the following (1 is largest -4 is smallest): __4___ The Sun __ ...
Neutron Stars and Black Holes - School
... dense ball of neutrons spinning rapidly. A neutron star is incredibly dense, made entirely of nuclear matter. Neutron stars often spin emitting jets of matter and radiation into space. The first pulsars detected were thought possibly to be signals from an alien intelligence until it was figured out ...
... dense ball of neutrons spinning rapidly. A neutron star is incredibly dense, made entirely of nuclear matter. Neutron stars often spin emitting jets of matter and radiation into space. The first pulsars detected were thought possibly to be signals from an alien intelligence until it was figured out ...
For each statement or question, select the word or expression that
... A. sun, red giant, Earth, galaxy B. red giant, sun, galaxy, Earth C. Earth, sun, red giant, galaxy D. galaxy, Earth, sun, red giant ____ 19. The Milky Way is an example of a(n) A. spiral galaxy B. elliptical galaxy C. summer constellation D. winter constellation ____ 20. Active galaxies are thought ...
... A. sun, red giant, Earth, galaxy B. red giant, sun, galaxy, Earth C. Earth, sun, red giant, galaxy D. galaxy, Earth, sun, red giant ____ 19. The Milky Way is an example of a(n) A. spiral galaxy B. elliptical galaxy C. summer constellation D. winter constellation ____ 20. Active galaxies are thought ...
Universe CBA Review - cms16-17
... 33.) What type of EMS wave has the longest wavelength? _____________________ 34.) Does infrared or x-ray waves have a longer wavelength? __________________ 35.) What type of wave has the highest frequency in the EMS? __________________ 36.) Draw and label the visible light spectrum ...
... 33.) What type of EMS wave has the longest wavelength? _____________________ 34.) Does infrared or x-ray waves have a longer wavelength? __________________ 35.) What type of wave has the highest frequency in the EMS? __________________ 36.) Draw and label the visible light spectrum ...
New Directions in Star Cluster Research
... Astrophysics (physics of stars) Is not an experimental science - we cannot devise and conduct experiments in order to test theories Theory is validated by observations Evidence often derived from past events Information we can gather is very restricted - apparent brightness (depends on distance), l ...
... Astrophysics (physics of stars) Is not an experimental science - we cannot devise and conduct experiments in order to test theories Theory is validated by observations Evidence often derived from past events Information we can gather is very restricted - apparent brightness (depends on distance), l ...
MPG press release
... a few seconds to a few minutes. The cause of these gamma-ray bursts (GRBs) is still not fully understood. Even more puzzling are some bursts with an exceptionally long afterglow of gamma rays with a particularly high energy. One of the major scientific goals of NASA´s GLAST mission is to find out m ...
... a few seconds to a few minutes. The cause of these gamma-ray bursts (GRBs) is still not fully understood. Even more puzzling are some bursts with an exceptionally long afterglow of gamma rays with a particularly high energy. One of the major scientific goals of NASA´s GLAST mission is to find out m ...
The Life and Times of a Neutron Star
... Exotic neutron stars may not be so rare. • Highly magnetized neutron stars may be as common as standard radio pulsars, but they don’t radio out their locations so they are harder to find. ...
... Exotic neutron stars may not be so rare. • Highly magnetized neutron stars may be as common as standard radio pulsars, but they don’t radio out their locations so they are harder to find. ...
doc
... relatively small amount was created in normal (and giant) stars, and in supernovae. Lithium - Created in the Big Bang, somewhat later than hydrogen. A small amount was created by cosmic rays (not covered in this class). Beryllium, Boron - Created by cosmic rays interacting with other elements (not c ...
... relatively small amount was created in normal (and giant) stars, and in supernovae. Lithium - Created in the Big Bang, somewhat later than hydrogen. A small amount was created by cosmic rays (not covered in this class). Beryllium, Boron - Created by cosmic rays interacting with other elements (not c ...
PowerPoint Presentation - Super Massive Black Holes
... Universe such as exploded stars, clusters of galaxies, and matter around black holes. ...
... Universe such as exploded stars, clusters of galaxies, and matter around black holes. ...
The Earth
... big it is. I mean, you may think it’s a long way down the road to the chemist’s, but that's just peanuts to space. Douglas ...
... big it is. I mean, you may think it’s a long way down the road to the chemist’s, but that's just peanuts to space. Douglas ...
!
... (6) You are the scientific consultant for the next James Bond movie, in which the villain develops a device able to (slightly) squeeze the Sun. The villain plans to hold the Earth to ransom, saying that the stronger gravity at the surface of the squeezed Sun will cause the Sun to collapse. Is the vi ...
... (6) You are the scientific consultant for the next James Bond movie, in which the villain develops a device able to (slightly) squeeze the Sun. The villain plans to hold the Earth to ransom, saying that the stronger gravity at the surface of the squeezed Sun will cause the Sun to collapse. Is the vi ...
Introduction to Astronomy
... • Also faintly visible at other wavelengths • A few hundred are now known • What are they? Rapidly spinning neutron stars, whose strong magnetic fields accelerate plasma to produce the beam of radio waves ...
... • Also faintly visible at other wavelengths • A few hundred are now known • What are they? Rapidly spinning neutron stars, whose strong magnetic fields accelerate plasma to produce the beam of radio waves ...
The “Big Bang” Theory
... • ________________ is our closest star. • All stars go through a similar evolution or life cycle which includes… – _________ (H) to _________ (He) and then _________ (He) to __________ (C) ...
... • ________________ is our closest star. • All stars go through a similar evolution or life cycle which includes… – _________ (H) to _________ (He) and then _________ (He) to __________ (C) ...
Origins of the Universe
... • Accidentally detected faint radiation on a radio telescope in 1965 • Determined that the radiation was leftover thermal energy from the “Big Bang” ...
... • Accidentally detected faint radiation on a radio telescope in 1965 • Determined that the radiation was leftover thermal energy from the “Big Bang” ...
Nineteenth lecture
... Soooooo, ultimately we wind up with the solar system we call HOME. (Ever wonder why all the planets except for Pluto rotate in the same direction around the sun, in a flat plane?) ...
... Soooooo, ultimately we wind up with the solar system we call HOME. (Ever wonder why all the planets except for Pluto rotate in the same direction around the sun, in a flat plane?) ...
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.