Chapter 21 Stellar Explosions
... Supernovae leave remnants—the expanding clouds of material from the explosion. The Crab nebula is a remnant from a supernova explosion that occurred in the year 1054. ...
... Supernovae leave remnants—the expanding clouds of material from the explosion. The Crab nebula is a remnant from a supernova explosion that occurred in the year 1054. ...
Astrophysics for the next decade
... – Important: spatial resolution and large wavelength coverage – IR observations with large (>8m) telescopes, CanariCam (GTC), VLTI (MATISSE) JWST, ELTs – ALMA will be the champion for this field Wolf & Klahr 2005 ...
... – Important: spatial resolution and large wavelength coverage – IR observations with large (>8m) telescopes, CanariCam (GTC), VLTI (MATISSE) JWST, ELTs – ALMA will be the champion for this field Wolf & Klahr 2005 ...
Synthetic Stellar Populations Encyclopedia of Astronomy & Astrophysics eaa.iop.org Guy Worthey
... effect is a large halo of roughly spherical shape. On the other hand, if one finds all the stars in the Galaxy younger than a billion years, virtually all of them are in the very thin Galactic disk. They have orderly, near-circular orbits with all stars rotating clockwise as seen from above the Gala ...
... effect is a large halo of roughly spherical shape. On the other hand, if one finds all the stars in the Galaxy younger than a billion years, virtually all of them are in the very thin Galactic disk. They have orderly, near-circular orbits with all stars rotating clockwise as seen from above the Gala ...
slides - Department of Physics and Astronomy
... Why does the North Star appear to be fixed in the sky while all other object move? What would be the view of the night sky from the North pole? Why can't we see the same constellations in the evening sky throughout the year? Why haven’t constellation patters changed since they have been established ...
... Why does the North Star appear to be fixed in the sky while all other object move? What would be the view of the night sky from the North pole? Why can't we see the same constellations in the evening sky throughout the year? Why haven’t constellation patters changed since they have been established ...
Astro-2: History of the Universe
... Measuring velocities. There is more to life than distances, says Hubble.. • Hubble and his colleague Slipher and Humason use big telescopes to take spectra of those galaxies… • They want to find out what galaxies are made of! • Surprise, surprise! they discover that most galaxies are moving AWAY ...
... Measuring velocities. There is more to life than distances, says Hubble.. • Hubble and his colleague Slipher and Humason use big telescopes to take spectra of those galaxies… • They want to find out what galaxies are made of! • Surprise, surprise! they discover that most galaxies are moving AWAY ...
QDSpaperFred1.tex
... the Hipparchos data provides distance measurements or lower limits that provide an easy distinction between the relatively low luminosity main-sequence stars that could host colonies, and the very large, short-lived giant stars. As new instruments become available a search of greater sensitivity bec ...
... the Hipparchos data provides distance measurements or lower limits that provide an easy distinction between the relatively low luminosity main-sequence stars that could host colonies, and the very large, short-lived giant stars. As new instruments become available a search of greater sensitivity bec ...
Fossil Galaxies
... Astronomers and cosmologists have a problem on their hands. Their trusted computer simulations of the evolving universe predict that thousands of dwarf galaxies should currently exist in orbit around our Milky Way galaxy. However, only a few dozen dwarf galaxies have been observed. Called the “missi ...
... Astronomers and cosmologists have a problem on their hands. Their trusted computer simulations of the evolving universe predict that thousands of dwarf galaxies should currently exist in orbit around our Milky Way galaxy. However, only a few dozen dwarf galaxies have been observed. Called the “missi ...
Galaxy Evolution
... Fig. 2.—Top: Determination of cluster and group baryon fractions within r500 as a function of M500 (bottom axis) and velocity dispersion (top axis). X-ray gas mass fractions from Vikhlinin et al. (2006; circles) and Gastaldello et al. (2006; triangles) and the stellar mass fractions ( BCG +ICL+galax ...
... Fig. 2.—Top: Determination of cluster and group baryon fractions within r500 as a function of M500 (bottom axis) and velocity dispersion (top axis). X-ray gas mass fractions from Vikhlinin et al. (2006; circles) and Gastaldello et al. (2006; triangles) and the stellar mass fractions ( BCG +ICL+galax ...
test - Scioly.org
... 16) The Particle Data Group documents quote a "best modern value" of the Hubble parameter as 54 km/s per mega parsec (+/- 10%). This value comes from the use of type Ia supernovae (which give relative distances to about 5%) along with data from Cepheid variables gathered by the Hubble Space Telescop ...
... 16) The Particle Data Group documents quote a "best modern value" of the Hubble parameter as 54 km/s per mega parsec (+/- 10%). This value comes from the use of type Ia supernovae (which give relative distances to about 5%) along with data from Cepheid variables gathered by the Hubble Space Telescop ...
The Universe
... radiation of most stars lies here, so the observation of the stars that form galaxies has been a major component of optical astronomy. It is also a favorable portion of the spectrum for observing ionized H II regions, and for examining the distribution of dusty arms. The dust present in the interste ...
... radiation of most stars lies here, so the observation of the stars that form galaxies has been a major component of optical astronomy. It is also a favorable portion of the spectrum for observing ionized H II regions, and for examining the distribution of dusty arms. The dust present in the interste ...
The Universe
... radiation of most stars lies here, so the observation of the stars that form galaxies has been a major component of optical astronomy. It is also a favorable portion of the spectrum for observing ionized H II regions, and for examining the distribution of dusty arms. The dust present in the interste ...
... radiation of most stars lies here, so the observation of the stars that form galaxies has been a major component of optical astronomy. It is also a favorable portion of the spectrum for observing ionized H II regions, and for examining the distribution of dusty arms. The dust present in the interste ...
ppt
... Andromeda's dust disk. They are evidence of an ancient head-on collision with neighboring dwarf galaxy along its polar axis M32 some 210 million years ago. ...
... Andromeda's dust disk. They are evidence of an ancient head-on collision with neighboring dwarf galaxy along its polar axis M32 some 210 million years ago. ...
Lecture 8: The Stars - Department of Physics and Astronomy
... Globular cluster: Up to a million or more stars in a dense ball bound together by gravity ...
... Globular cluster: Up to a million or more stars in a dense ball bound together by gravity ...
Introduction to Observational Cosmology
... – For compact or unresolved objects surveys are flux-limited (separate flux limit in each observational band). – For extended objects surveys are surface brightness limited (i.e. limited by the contrast to the background) ...
... – For compact or unresolved objects surveys are flux-limited (separate flux limit in each observational band). – For extended objects surveys are surface brightness limited (i.e. limited by the contrast to the background) ...
The Hydrogen Ionization Front-Photosphere
... Changes in one are reflected in changes in the other. Changes in the PC/PL relation at certain phases have some effect in the mean light PC/PL relation. If the LMC Cepheid PL relation is truly non-linear and linear relation is used, then….. ...
... Changes in one are reflected in changes in the other. Changes in the PC/PL relation at certain phases have some effect in the mean light PC/PL relation. If the LMC Cepheid PL relation is truly non-linear and linear relation is used, then….. ...
Section 4 Formation of the Universe Chapter 19
... Sirius, has a magnitude of -1.4. The dimmest star that can be seen with a microscope has a magnitude of 29. ...
... Sirius, has a magnitude of -1.4. The dimmest star that can be seen with a microscope has a magnitude of 29. ...
EXPLORATION OF THE KUIPER BELT BY HIGH
... modulus of VI is 4.5, and the moduli of VI for the three events are, respectively, 5.6, 7.2, and 5.3. Having shown that the events are neither related to the observation’s conditions nor to the Earth’s atmosphere, we compare them to diffraction profiles of interplanetary objects. The synthetic prof ...
... modulus of VI is 4.5, and the moduli of VI for the three events are, respectively, 5.6, 7.2, and 5.3. Having shown that the events are neither related to the observation’s conditions nor to the Earth’s atmosphere, we compare them to diffraction profiles of interplanetary objects. The synthetic prof ...
Archaeology of the Milky Way - Max-Planck
... its disk again and again as it does so. On its travels, stars were pulled out of the cluster and now reside in two tails around 15,000 light-years in length, which are also known as stellar streams. Computer models predict that Palomar 5 will dive into the Milky Way again in 100 million years and pr ...
... its disk again and again as it does so. On its travels, stars were pulled out of the cluster and now reside in two tails around 15,000 light-years in length, which are also known as stellar streams. Computer models predict that Palomar 5 will dive into the Milky Way again in 100 million years and pr ...
Westerlund 1 : A Super-Star Cluster within the Milky Way
... identified in the Milky Way. Wd1 hosts a rich population of OB supergiants, Wolf-Rayet stars, Luminous Blue Variables, Yellow Hypergiants and Red Supergiants, from which we infer an age of 3-5Myr. For an adopted Kroupa IMF we derive a mass of 105 M and radius of 0.3pc for an estimated distance of 2 ...
... identified in the Milky Way. Wd1 hosts a rich population of OB supergiants, Wolf-Rayet stars, Luminous Blue Variables, Yellow Hypergiants and Red Supergiants, from which we infer an age of 3-5Myr. For an adopted Kroupa IMF we derive a mass of 105 M and radius of 0.3pc for an estimated distance of 2 ...
Astro 7B – Solution Set 7 1 A Star is Born
... Draw the orbit of the Earth around the Sun, assuming the orbit is circular. Draw Sagittarius B2 a distance d away from the Sun. Note that Sagittarius B2 DOES NOT have to be located in the plane of the Earth’s orbit (and indeed it is not). Say that the line between the Sun and Sgr B2 makes an angle i ...
... Draw the orbit of the Earth around the Sun, assuming the orbit is circular. Draw Sagittarius B2 a distance d away from the Sun. Note that Sagittarius B2 DOES NOT have to be located in the plane of the Earth’s orbit (and indeed it is not). Say that the line between the Sun and Sgr B2 makes an angle i ...
Spring and Summer Sky Observer
... light years deep at the slightly bulging center. A light year is the distance light travels in a year, or about 5.9 million miles. Because Earth is part of the Milky Way, we cannot view the entire structure. However, one side of our galaxy is visible as a starry band across the night sky. Clusters a ...
... light years deep at the slightly bulging center. A light year is the distance light travels in a year, or about 5.9 million miles. Because Earth is part of the Milky Way, we cannot view the entire structure. However, one side of our galaxy is visible as a starry band across the night sky. Clusters a ...
Henriques B., White S., Lemson G., Thomas P., Guo Q., Marleau D
... Reincorporation of gas after ejection by SN feedback ( high-z low-z ) All other parameters have consistent regions at all z Any other parametrisation with time is ruled out, for example, in our model, a change in star formation efficiency is ruled out. ...
... Reincorporation of gas after ejection by SN feedback ( high-z low-z ) All other parameters have consistent regions at all z Any other parametrisation with time is ruled out, for example, in our model, a change in star formation efficiency is ruled out. ...
absolute past
... • It was not before Newton, one understood the law of gravity. According to Newton’s law, two bodies will attract each other with a force that is proportional to their mass, and inverse proportional to their distance. If we have the bodies, Earth and an apple, the two bodies attract each other, but ...
... • It was not before Newton, one understood the law of gravity. According to Newton’s law, two bodies will attract each other with a force that is proportional to their mass, and inverse proportional to their distance. If we have the bodies, Earth and an apple, the two bodies attract each other, but ...
Problems with the Perfect Circles
... • It was not before Newton, one understood the law of gravity. According to Newton’s law, two bodies will attract each other with a force that is proportional to their mass, and inverse proportional to their distance. If we have the bodies, Earth and an apple, the two bodies attract each other, but ...
... • It was not before Newton, one understood the law of gravity. According to Newton’s law, two bodies will attract each other with a force that is proportional to their mass, and inverse proportional to their distance. If we have the bodies, Earth and an apple, the two bodies attract each other, but ...
The Fundamental Plane, Stellar Popula6ons
... In terms of the fi7ed parameters of the FP itself, there appears to be no significant variaBon over the whole range in richness Next step: break these samples down further into age subsets, as there is evidence that age correlates with deviaBons from the FP ...
... In terms of the fi7ed parameters of the FP itself, there appears to be no significant variaBon over the whole range in richness Next step: break these samples down further into age subsets, as there is evidence that age correlates with deviaBons from the FP ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.