Ch17_Galaxies
... Galaxy Clusters • In general, all clusters need dark matter to explain galactic motions and the confinement of hot intergalactic gas within cluster • Near clusters appear to have their members fairly smoothly spread out, while far away clusters (and hence younger clusters) are more ragged looking – ...
... Galaxy Clusters • In general, all clusters need dark matter to explain galactic motions and the confinement of hot intergalactic gas within cluster • Near clusters appear to have their members fairly smoothly spread out, while far away clusters (and hence younger clusters) are more ragged looking – ...
FIRST LIGHT IN THE UNIVERSE
... • How effective are the various high z selection methods? - L*(z=6) i~26 where spectroscopy is hard - spectroscopic samples biased to include strong L - great reliance on photometric redshifts • Is there a decline in the UV luminosity density 3
... • How effective are the various high z selection methods? - L*(z=6) i~26 where spectroscopy is hard - spectroscopic samples biased to include strong L - great reliance on photometric redshifts • Is there a decline in the UV luminosity density 3
Unpublished draft available in format
... same thing; in the case of stars, any given star may demonstrate a whole string of concepts; e.g. a giant star of a late spectral type (M, R, N, S) may also be a long-period variable. Theoretically it is possible to achieve a class number which compounds all such attributes, but this might be a very ...
... same thing; in the case of stars, any given star may demonstrate a whole string of concepts; e.g. a giant star of a late spectral type (M, R, N, S) may also be a long-period variable. Theoretically it is possible to achieve a class number which compounds all such attributes, but this might be a very ...
SALT: a Spectral Adaptive Light curve Template for Type Ia
... of objects, SNe Ia exhibit variability in light curve shapes, colors, intrinsic luminosity and spectral features. Finding correlations among SN Ia observables is motivated by improving the estimation of their intrinsic luminosity on an event by event basis, in order to reduce the scatter in luminosi ...
... of objects, SNe Ia exhibit variability in light curve shapes, colors, intrinsic luminosity and spectral features. Finding correlations among SN Ia observables is motivated by improving the estimation of their intrinsic luminosity on an event by event basis, in order to reduce the scatter in luminosi ...
The paper on the Hubble constant published in 2010
... 共Received 11 January 2010; accepted 9 March 2010; published online 20 April 2010兲 Abstract: It is shown that the Hubble constant can be derived from the standard luminosity function of galaxies as well as from a new luminosity function as deduced from the mass-luminosity relationship for galaxies. A ...
... 共Received 11 January 2010; accepted 9 March 2010; published online 20 April 2010兲 Abstract: It is shown that the Hubble constant can be derived from the standard luminosity function of galaxies as well as from a new luminosity function as deduced from the mass-luminosity relationship for galaxies. A ...
phys-1600 - Dave Heppenstall
... • Galileo discovered the four largest moons orbiting Jupiter: Io, Europa, Ganymede and Calisto. • In Io's case, there are immense volcanoes which are constantly being churned inside out and renewing its surface. This is due to the close proximity to Jupiter and the enormous gravitational force. • Io ...
... • Galileo discovered the four largest moons orbiting Jupiter: Io, Europa, Ganymede and Calisto. • In Io's case, there are immense volcanoes which are constantly being churned inside out and renewing its surface. This is due to the close proximity to Jupiter and the enormous gravitational force. • Io ...
Age patterns in a sample of spiral galaxies
... younger than 108 yr, and not integrating luminosities over the entire disk, an instantaneous starburst can represent them reasonably well (e.g., [23, 13]). ...
... younger than 108 yr, and not integrating luminosities over the entire disk, an instantaneous starburst can represent them reasonably well (e.g., [23, 13]). ...
File - Mr. Gray`s Class
... Light Years and the Stars Beyond the solar system, there is a vast expanse of space, with an occasional grain of dust or elemental atom floating in the dark emptiness. The nearest other star system - known as Alpha Centauri and best seen from the Earth's southern latitudes - is so far away that the ...
... Light Years and the Stars Beyond the solar system, there is a vast expanse of space, with an occasional grain of dust or elemental atom floating in the dark emptiness. The nearest other star system - known as Alpha Centauri and best seen from the Earth's southern latitudes - is so far away that the ...
ultracam observations of pulsating sdB stars
... curves for pulsating sdB stars down to 15th mag. • amplitudes measurable to <0.5 mmag and new ...
... curves for pulsating sdB stars down to 15th mag. • amplitudes measurable to <0.5 mmag and new ...
Astronomy Astrophysics First detection of the field star overdensity in the Perseus... &
... suitable direction to undertake this study on Galactic structure and kinematics is towards the anticenter and the Perseus arm. First, this direction presents lower interstellar extinction than the direction pointing to the Galactic center. Second, although slightly depending on the pitch angle, this ...
... suitable direction to undertake this study on Galactic structure and kinematics is towards the anticenter and the Perseus arm. First, this direction presents lower interstellar extinction than the direction pointing to the Galactic center. Second, although slightly depending on the pitch angle, this ...
1. Basic Properties of Stars
... example, the transition from E 3 to E 2 is called Hα, and is the first line of the Balmer series. e) Stellar Masses Since stars are so far away, it is impossible to measure their masses directly. Instead, we look for binary star systems and use Newton's law of gravity to measure their masses. Two st ...
... example, the transition from E 3 to E 2 is called Hα, and is the first line of the Balmer series. e) Stellar Masses Since stars are so far away, it is impossible to measure their masses directly. Instead, we look for binary star systems and use Newton's law of gravity to measure their masses. Two st ...
Astrophysics
... describe the properties of stars: luminosity, radius and mass, temperature and spectral type; use the Hertzsprung-Russell diagram to describe types of stars, their evolution and death; explain fusion as the energy source of a star; compare the Milky Way galaxy to other galaxies; describe characteris ...
... describe the properties of stars: luminosity, radius and mass, temperature and spectral type; use the Hertzsprung-Russell diagram to describe types of stars, their evolution and death; explain fusion as the energy source of a star; compare the Milky Way galaxy to other galaxies; describe characteris ...
Major constellations
... widely known for containing the plough sometimes known as the big dipper. It has declination 50 degrees and right ascension 11 hours. It contains 16 stars, 5 galaxies,1 binary star and a planetary Nebula. According to some Native American legends, the bowl of the Big Dipper is a giant bear and the s ...
... widely known for containing the plough sometimes known as the big dipper. It has declination 50 degrees and right ascension 11 hours. It contains 16 stars, 5 galaxies,1 binary star and a planetary Nebula. According to some Native American legends, the bowl of the Big Dipper is a giant bear and the s ...
SOUTHERN CONSTELLATION, SEXTANS Sextans constellation
... in December 1923. The star lies almost exactly south of the bright star Regulus in Leo constellation. Beta Sextantis is a blue-white main sequence dwarf with the stellar classification B6V. It has an apparent visual magnitude of 5.0 to 5.1 and is approximately 345 light years distant. It is classifi ...
... in December 1923. The star lies almost exactly south of the bright star Regulus in Leo constellation. Beta Sextantis is a blue-white main sequence dwarf with the stellar classification B6V. It has an apparent visual magnitude of 5.0 to 5.1 and is approximately 345 light years distant. It is classifi ...
APOD 2016 Calendar
... Image Credit: NASA, ESA, S. Baum & C. O’Dea (RIT), R. Perley and W. Cotton (NRAO/AUI/NSF), and the Hubble Heritage Team (STScI/AURA) Explanation: Why does this galaxy emit such spectacular jets? No one is sure, but it is likely related to an active supermassive black hole at its center. The galaxy a ...
... Image Credit: NASA, ESA, S. Baum & C. O’Dea (RIT), R. Perley and W. Cotton (NRAO/AUI/NSF), and the Hubble Heritage Team (STScI/AURA) Explanation: Why does this galaxy emit such spectacular jets? No one is sure, but it is likely related to an active supermassive black hole at its center. The galaxy a ...
Chapter 15
... • These population III stars may not be observable for three reasons – Only short-lived massive population III stars can form – consequently none are left today – Population III stars exist, but are masquerading as Pop II since their atmospheres have been contaminated by gas ejected when a more mass ...
... • These population III stars may not be observable for three reasons – Only short-lived massive population III stars can form – consequently none are left today – Population III stars exist, but are masquerading as Pop II since their atmospheres have been contaminated by gas ejected when a more mass ...
Images
... needs to be measured are the quantities on the left. The light profile (after deprojection) gives n, and stellar spectra yield Vrot and r (again, after appropriate deprojection). The most challenging parameter is , the anisotropy parameter. For a non-rotating galaxy, the third term is zero (Vrot ...
... needs to be measured are the quantities on the left. The light profile (after deprojection) gives n, and stellar spectra yield Vrot and r (again, after appropriate deprojection). The most challenging parameter is , the anisotropy parameter. For a non-rotating galaxy, the third term is zero (Vrot ...
binary stars
... The angular separations and orbital paths are only apparent because in general the orbit is inclined to the plane of the sky, so we see the orbit in projection ...
... The angular separations and orbital paths are only apparent because in general the orbit is inclined to the plane of the sky, so we see the orbit in projection ...
PowerPoint Presentation - 21. Galaxy Evolution
... • What are active galactic nuclei and quasars? • The nature of quasars was once hotly debated. What evidence supports the idea that they are the active galactic nuclei of distant galaxies? • What do we think is the source of power for active galactic ...
... • What are active galactic nuclei and quasars? • The nature of quasars was once hotly debated. What evidence supports the idea that they are the active galactic nuclei of distant galaxies? • What do we think is the source of power for active galactic ...
The Sun and the Stars
... The angular separations and orbital paths are only apparent because in general the orbit is inclined to the plane of the sky, so we see the orbit in projection ...
... The angular separations and orbital paths are only apparent because in general the orbit is inclined to the plane of the sky, so we see the orbit in projection ...
Chapter 17 - Astronomy
... observing galaxies he combined their radial velocities with their measured distances, and deduced what is now called the Hubble law of redshifts. ...
... observing galaxies he combined their radial velocities with their measured distances, and deduced what is now called the Hubble law of redshifts. ...
the physical vacuum and gravity.
... specified number, and will not at high densities of cosmic bodies they represent an impenetrable screen for physical vacuum and no gravity. This means that in the center of spiral galaxies, including the Milky Way, there is no such body, which is due to the huge gravitational absorbs coming stars, b ...
... specified number, and will not at high densities of cosmic bodies they represent an impenetrable screen for physical vacuum and no gravity. This means that in the center of spiral galaxies, including the Milky Way, there is no such body, which is due to the huge gravitational absorbs coming stars, b ...
strolympics - Chandra X
... our clocks, phones, or other devices. In the Olympic Games, we use time to dictate how long events are held and to measure how fast athletes perform. Time plays such a crucial role that we have developed many sayings involving time, like “time is running out” or it’s “crunch time.” But how do you ac ...
... our clocks, phones, or other devices. In the Olympic Games, we use time to dictate how long events are held and to measure how fast athletes perform. Time plays such a crucial role that we have developed many sayings involving time, like “time is running out” or it’s “crunch time.” But how do you ac ...
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.