ppt document - FacStaff Home Page for CBU
... Way. By looking in the infrared (which is not scattered as much as visible light by the dust and gas), we see that we are not in the center of the disk, but somewhere away from the center. The approximate size of the Milky Way appears to be about 100,000 light years across and 2,000 light years thic ...
... Way. By looking in the infrared (which is not scattered as much as visible light by the dust and gas), we see that we are not in the center of the disk, but somewhere away from the center. The approximate size of the Milky Way appears to be about 100,000 light years across and 2,000 light years thic ...
Interacting Galaxies
... can lead to spectacular mergers and spawn vast amounts of new star formation. Astronomers estimate that in the nearby universe, 1 out of every 20 gas-rich disk galaxies, like our Milky Way galaxy, is in the act of colliding. Galaxy mergers were much more common in the past, however, when the expandi ...
... can lead to spectacular mergers and spawn vast amounts of new star formation. Astronomers estimate that in the nearby universe, 1 out of every 20 gas-rich disk galaxies, like our Milky Way galaxy, is in the act of colliding. Galaxy mergers were much more common in the past, however, when the expandi ...
File
... • A protostar’s temperature continually increases until it reaches about 10,000,000 °C. • At this temperature, nuclear fusion begins. Nuclear fusion is a process in which less-massive atomic nuclei combine to form more-massive nuclei. The process releases enormous amounts of energy. • The onset of n ...
... • A protostar’s temperature continually increases until it reaches about 10,000,000 °C. • At this temperature, nuclear fusion begins. Nuclear fusion is a process in which less-massive atomic nuclei combine to form more-massive nuclei. The process releases enormous amounts of energy. • The onset of n ...
a report on pulsars, written for PHAS1901
... dispersion. All electromagnetic radiation moves at a constant speed through a vacuum, but is slowed proportionally to it's wavelength when it travels through a medium. the interstellar medium is often regarded as a vacuum, but in actual fact is occupied by atoms and free electrons, albeit at extreme ...
... dispersion. All electromagnetic radiation moves at a constant speed through a vacuum, but is slowed proportionally to it's wavelength when it travels through a medium. the interstellar medium is often regarded as a vacuum, but in actual fact is occupied by atoms and free electrons, albeit at extreme ...
PH607 – Galaxies
... is such that the orbital speed of most stars in the galaxy does not depend strongly on its distance from the center. Away from the central bulge or outer rim, the typical stellar velocity is between 210 and 240 km/s. Hence the orbital period of the typical star is directly proportional only to the l ...
... is such that the orbital speed of most stars in the galaxy does not depend strongly on its distance from the center. Away from the central bulge or outer rim, the typical stellar velocity is between 210 and 240 km/s. Hence the orbital period of the typical star is directly proportional only to the l ...
File - Mr. Pelton Science
... of pulsation between 1 and 100 days. (luminosity as much as doubles) ...
... of pulsation between 1 and 100 days. (luminosity as much as doubles) ...
Dark Matter -24-------------------------------~-----------R-E-S-O-N-A-N-C
... There have been three reactions to the discovery of dark matter: (i) It doesn't exist; the law of gravitation must be modified so that the stars are all there is to a galaxy. (ii) Dark matter exists, but consists entirely of ord~nary matter - Jupiter-like objects called broum dwarfs that are not mas ...
... There have been three reactions to the discovery of dark matter: (i) It doesn't exist; the law of gravitation must be modified so that the stars are all there is to a galaxy. (ii) Dark matter exists, but consists entirely of ord~nary matter - Jupiter-like objects called broum dwarfs that are not mas ...
Lecture1-1
... The actual measured data (left) and constructed models (model) are compared on the Dn(4000), HdA index plane. The solid lines in the left panels are tracks of burst star formation model and the points are “continuus” star formation model. ...
... The actual measured data (left) and constructed models (model) are compared on the Dn(4000), HdA index plane. The solid lines in the left panels are tracks of burst star formation model and the points are “continuus” star formation model. ...
Science and the Universe - Wayne State University Physics and
... From our location within the Galaxy, we cannot see through its far rim because the space between stars is not empty, but contains (an extremely sparse distribution of) interstellar dust or gas which absorbs visible light The interstellar gas and dust are believed to be the raw material for future fo ...
... From our location within the Galaxy, we cannot see through its far rim because the space between stars is not empty, but contains (an extremely sparse distribution of) interstellar dust or gas which absorbs visible light The interstellar gas and dust are believed to be the raw material for future fo ...
kentucky colloquium 03-05ppt - LIGO
... masses and propagate away from their sources as a space-time warpage at the speed of light ...
... masses and propagate away from their sources as a space-time warpage at the speed of light ...
Star formation in galaxies over the last 10 billion
... will reach even further back in time, and observe redshifted visible & infrared light in earliest galaxies ...
... will reach even further back in time, and observe redshifted visible & infrared light in earliest galaxies ...
Lecture 5
... Andromeda Nebula" (Messier object M31). Searching the photographic record, he found 11 more novae. Curtis noticed that these novae were, on average, 10 magnitudes fainter than those that occurred within our galaxy. As a result he was able to come up with a distance estimate of 150,000 parsecs. He be ...
... Andromeda Nebula" (Messier object M31). Searching the photographic record, he found 11 more novae. Curtis noticed that these novae were, on average, 10 magnitudes fainter than those that occurred within our galaxy. As a result he was able to come up with a distance estimate of 150,000 parsecs. He be ...
Power-point slides for Lecture 2
... the star enters a phase of rapid Wolf-Rayet mass loss that does greatly affect everything – the explosion, light curve, nucleosynthesis and remnant properties. A massive hydrogen envelope may also make the star more difficult to explode. 3) Mass loss sets an upper bound to the luminosity of red supe ...
... the star enters a phase of rapid Wolf-Rayet mass loss that does greatly affect everything – the explosion, light curve, nucleosynthesis and remnant properties. A massive hydrogen envelope may also make the star more difficult to explode. 3) Mass loss sets an upper bound to the luminosity of red supe ...
Slide 1
... Andromeda Nebula" (Messier object M31). Searching the photographic record, he found 11 more novae. Curtis noticed that these novae were, on average, 10 magnitudes fainter than those that occurred within our galaxy. As a result he was able to come up with a distance estimate of 150,000 parsecs. He be ...
... Andromeda Nebula" (Messier object M31). Searching the photographic record, he found 11 more novae. Curtis noticed that these novae were, on average, 10 magnitudes fainter than those that occurred within our galaxy. As a result he was able to come up with a distance estimate of 150,000 parsecs. He be ...
- EPJ Web of Conferences
... Figure 2. (a) Mean metallicity, and (b) metallicity dispersion, [Fe/H], vs. system absolute magnitude, MV ,total , for the dwarf galaxy satellites of the Milky Way and the massive globular cluster Cen. Figure from [10]. ...
... Figure 2. (a) Mean metallicity, and (b) metallicity dispersion, [Fe/H], vs. system absolute magnitude, MV ,total , for the dwarf galaxy satellites of the Milky Way and the massive globular cluster Cen. Figure from [10]. ...
European Extremely Large Telescope (E-ELT) - DESY
... particular, no examples of large elliptical galaxies are within reach of current telescopes for this type of study. With its superior resolution and photon collecting power the EELT will allow us to perform precise photometry and spectroscopy on the stellar populations of a much more representative ...
... particular, no examples of large elliptical galaxies are within reach of current telescopes for this type of study. With its superior resolution and photon collecting power the EELT will allow us to perform precise photometry and spectroscopy on the stellar populations of a much more representative ...
DoAr21_AAS2005 - Astronomy at Swarthmore College
... Weak-lined T Tauri Star (WTTS), having shown H-alpha in emission in the 1950s but without H-alpha emission reported subsequently and without a strong IR excess. It is only about 1 Myr old (left) and has already been identified, via lowresolution x-ray spectroscopy, to have strong, hard, and variable ...
... Weak-lined T Tauri Star (WTTS), having shown H-alpha in emission in the 1950s but without H-alpha emission reported subsequently and without a strong IR excess. It is only about 1 Myr old (left) and has already been identified, via lowresolution x-ray spectroscopy, to have strong, hard, and variable ...
Cartwheel Galaxy - Chandra X
... 10. A study of ULXs has determined that very few X-ray sources with luminosity greater than 1040 erg s−1 remain after ~15 Myr and few remain after ~30 Myr. 11. In the Cartwheel galaxy, it appears that a shock wave is moving radially outward in the disk. 9 sources of the 21 detected in the Chandra im ...
... 10. A study of ULXs has determined that very few X-ray sources with luminosity greater than 1040 erg s−1 remain after ~15 Myr and few remain after ~30 Myr. 11. In the Cartwheel galaxy, it appears that a shock wave is moving radially outward in the disk. 9 sources of the 21 detected in the Chandra im ...
Galaxies
... observed instead is that rotation curves tend to remain high as far out as they can be measured. This implies the existence of massive halos of dark matter in galaxies. The nature of the material comprising this dark matter is completely unknown at present, making this one of the greatest problems o ...
... observed instead is that rotation curves tend to remain high as far out as they can be measured. This implies the existence of massive halos of dark matter in galaxies. The nature of the material comprising this dark matter is completely unknown at present, making this one of the greatest problems o ...
Astronomy (C) - North Carolina Science Olympiad
... thermonuclear event Briefly outshines entire host galaxy (i.e. 1010 times brighter than Sun) Uniform peak magnitude ...
... thermonuclear event Briefly outshines entire host galaxy (i.e. 1010 times brighter than Sun) Uniform peak magnitude ...
charts_set_9
... Halo: stars and globular clusters swarm around center of Milky Way. Very elliptical orbits with random orientations. They also cross the disk. Bulge: similar to halo. ...
... Halo: stars and globular clusters swarm around center of Milky Way. Very elliptical orbits with random orientations. They also cross the disk. Bulge: similar to halo. ...
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.