Measuring the masses of clusters
... •! Calculated mass-to-light ratio and determined that about 90% of the mass necessary to account for observed ratio was missing and therefore invisible, or "dark". But nobody believed him … ...
... •! Calculated mass-to-light ratio and determined that about 90% of the mass necessary to account for observed ratio was missing and therefore invisible, or "dark". But nobody believed him … ...
First Light for May, 2001 - South Bay Astronomical Society
... The transit method can only find systems that are aligned with our line of sight. The Stellar Wobble Method can find planetary systems that are not fully aligned with our line of sight but still have a component that provides a relative motion towards or away from Earth. Thus, the Wobble method pro ...
... The transit method can only find systems that are aligned with our line of sight. The Stellar Wobble Method can find planetary systems that are not fully aligned with our line of sight but still have a component that provides a relative motion towards or away from Earth. Thus, the Wobble method pro ...
The Birdseed Galaxy - Secondary Education
... NOTE to Teacher: On this scale, the size of stars is generally much smaller than the smallest grain of sand. The bird seed is about the size of red giant stars. But for the purposes of getting students to have a sense of scale, this is an OK approximation. How can we imagine what it would be like to ...
... NOTE to Teacher: On this scale, the size of stars is generally much smaller than the smallest grain of sand. The bird seed is about the size of red giant stars. But for the purposes of getting students to have a sense of scale, this is an OK approximation. How can we imagine what it would be like to ...
Future Supernova Projects
... • small dispersion • single objects (simpler than galaxies) • can be observed over wide z range Challenges: • dust (grey dust) • chemical composition • evolution • photometric calibration (e.g., Vega) • environmental differences Systematics • lensing Step 2 ...
... • small dispersion • single objects (simpler than galaxies) • can be observed over wide z range Challenges: • dust (grey dust) • chemical composition • evolution • photometric calibration (e.g., Vega) • environmental differences Systematics • lensing Step 2 ...
Dynamical models of the nucleus of M31
... relaxation (details depend on age of stars) • vector resonant relaxation conserves semi-major axis and eccentricity but not the direction of orbit normal • preliminary models suggest that some or all of the curious features of the stellar distribution in the Galactic center arise naturally in therma ...
... relaxation (details depend on age of stars) • vector resonant relaxation conserves semi-major axis and eccentricity but not the direction of orbit normal • preliminary models suggest that some or all of the curious features of the stellar distribution in the Galactic center arise naturally in therma ...
Sirius Astronomer - Orange County Astronomers
... energy photons (gamma rays) when they traverse extremely large distances. The Integral measurements show no measurable difference in polarization between low and high energy gamma rays emanating from a very bright and distant gamma-ray burst. To have negligible effect on this measurement, the quantu ...
... energy photons (gamma rays) when they traverse extremely large distances. The Integral measurements show no measurable difference in polarization between low and high energy gamma rays emanating from a very bright and distant gamma-ray burst. To have negligible effect on this measurement, the quantu ...
ppt
... The parametric methods work only when there are two proper-motion groups (cluster and field stars) distributed according to normal bivariate function. The most common departure from these assumptions is the non-Gaussian shape of the field proper-motion distribution (Sun’s peculiar motion + Galactic ...
... The parametric methods work only when there are two proper-motion groups (cluster and field stars) distributed according to normal bivariate function. The most common departure from these assumptions is the non-Gaussian shape of the field proper-motion distribution (Sun’s peculiar motion + Galactic ...
Research proposal uploaded for ESO fellowship
... global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat supernova feedback, which are parametrized to reproduce the faint-end of the luminosity function (Cole et al. 2000; Guo et al. ...
... global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat supernova feedback, which are parametrized to reproduce the faint-end of the luminosity function (Cole et al. 2000; Guo et al. ...
NGC 3370 Spiral Galaxy - University of Kentucky
... F = Gm1m2/r2 where m1 and m2 are the masses of two objects and r is the distance between them. Here is a little thought experiment. What if the Sun were to collapse and form a black hole right now? Let’s suppose that all of the mass of the Sun falls into the black hole. So the mass doesn’t change at ...
... F = Gm1m2/r2 where m1 and m2 are the masses of two objects and r is the distance between them. Here is a little thought experiment. What if the Sun were to collapse and form a black hole right now? Let’s suppose that all of the mass of the Sun falls into the black hole. So the mass doesn’t change at ...
Universe, Dark Energy and Dark Matter
... caused by the following thing. A spherically-symmetrical material shell cannot produce any gravitational field in the whole inner cavity and the space-time must be flat. The Universe does not contain such huge spherical regions but we can imagine them by “scooping” out all the galaxies out of a big ...
... caused by the following thing. A spherically-symmetrical material shell cannot produce any gravitational field in the whole inner cavity and the space-time must be flat. The Universe does not contain such huge spherical regions but we can imagine them by “scooping” out all the galaxies out of a big ...
1 - People Server at UNCW
... If you are stuck, or running out of time, indicate as completely as possible, the methods and steps you would take to tackle the problem. Also, indicate any relevant information that you ...
... If you are stuck, or running out of time, indicate as completely as possible, the methods and steps you would take to tackle the problem. Also, indicate any relevant information that you ...
Binocular Objects (MS Word)
... The Heart of the Scorpion, this red giant is about 600 million miles across and 9,000 times more luminous than the sun. It is thought to be about 520 light years away. Antares has a green companion star which is a radio source, but it is not visible with binoculars. M4 Binoculars show this globular ...
... The Heart of the Scorpion, this red giant is about 600 million miles across and 9,000 times more luminous than the sun. It is thought to be about 520 light years away. Antares has a green companion star which is a radio source, but it is not visible with binoculars. M4 Binoculars show this globular ...
Characteristics of Our Galaxy
... variables (useful for judging distances), pre-main sequence stars, T-Tauri stars, Herbigharo objects, and even some A stars can be found in the arms. These stars are very metal rich and have highly circular orbits, although they comprise likely less than one percent of Milky Way stars. Young thin d ...
... variables (useful for judging distances), pre-main sequence stars, T-Tauri stars, Herbigharo objects, and even some A stars can be found in the arms. These stars are very metal rich and have highly circular orbits, although they comprise likely less than one percent of Milky Way stars. Young thin d ...
Studying Variable stars using Small Telescopes Observational
... Advantages of having Small Telescopes – 1. Convenient access to a telescope. 2. For sufficiently bright stars, small telescopes achieve same photometric accuracy as that of large telescopes. 3. With advanced increasing sophistications in optics and electronics it is possible for smaller telescopes t ...
... Advantages of having Small Telescopes – 1. Convenient access to a telescope. 2. For sufficiently bright stars, small telescopes achieve same photometric accuracy as that of large telescopes. 3. With advanced increasing sophistications in optics and electronics it is possible for smaller telescopes t ...
Widener University
... c) Calculate the Roche limit for a small frozen moon composed of water ice ( = 1000 kg/m3) near this ...
... c) Calculate the Roche limit for a small frozen moon composed of water ice ( = 1000 kg/m3) near this ...
Winter Variable Star Observing Activity in the
... Winter Variable Star Observing Activity in the Constellation Gemini Zeta Geminorum in the Constellation Gemini Most of us are familiar with the winter constellation Orion the Hunter. The constellation Gemini, above and to the northeast of Orion, is also easily visible in the winter nighttime sky. On ...
... Winter Variable Star Observing Activity in the Constellation Gemini Zeta Geminorum in the Constellation Gemini Most of us are familiar with the winter constellation Orion the Hunter. The constellation Gemini, above and to the northeast of Orion, is also easily visible in the winter nighttime sky. On ...
16. Magnitude Systems
... system is problematic for a number of reasons • Vega does not have a flat spectral energy distribution (SED...the flux-wavelength relation) so it doesn’t make much sense to force it to be flat • This becomes even more problematic for UV and IR surveys (surveys outside of the optical), where Vega dev ...
... system is problematic for a number of reasons • Vega does not have a flat spectral energy distribution (SED...the flux-wavelength relation) so it doesn’t make much sense to force it to be flat • This becomes even more problematic for UV and IR surveys (surveys outside of the optical), where Vega dev ...
pptx
... The Sun orbits the Galactic centre at about 200 km/s Other disc stars near the Sun are moving at only ~20 km/s relative to the Sun The whole disc must be rotating ...
... The Sun orbits the Galactic centre at about 200 km/s Other disc stars near the Sun are moving at only ~20 km/s relative to the Sun The whole disc must be rotating ...
Standing in Awe - Auckland Astronomical Society
... Libra lies prominently in the June sky, preceding the Scorpion across the sky. At 538° square in size, Libra is one of the larger constellations, though its stars are poorly shown, the brightest attaining magnitude 2.6. In fact, Libra is one of the poorer adorned constellations, there being only 2.4 ...
... Libra lies prominently in the June sky, preceding the Scorpion across the sky. At 538° square in size, Libra is one of the larger constellations, though its stars are poorly shown, the brightest attaining magnitude 2.6. In fact, Libra is one of the poorer adorned constellations, there being only 2.4 ...
ASTR 1020 General Astronomy: Stars and Galaxies REVIEW
... Might die in 1031 years if protons prove to be unstable themselves. That’s 10,000,000,000,000,000,000,000,000,000,000 years! Really don’t know if universe will still be here. ...
... Might die in 1031 years if protons prove to be unstable themselves. That’s 10,000,000,000,000,000,000,000,000,000,000 years! Really don’t know if universe will still be here. ...
class 2, F10
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
P7 Higher mark scheme - Corby Technical School
... These are at similar distances / the other stars are all at very different distances [1] ...
... These are at similar distances / the other stars are all at very different distances [1] ...
Cepheids
... nearby galaxies as having smaller periods for the same brightness • Problem with Milky Way Cepheids: due to distance differences, how to identify overtone pulsators among Cepheids with different distances ? • Milky Way Cepheids sample is supposed to be contaminated by unidentified first-overtone ...
... nearby galaxies as having smaller periods for the same brightness • Problem with Milky Way Cepheids: due to distance differences, how to identify overtone pulsators among Cepheids with different distances ? • Milky Way Cepheids sample is supposed to be contaminated by unidentified first-overtone ...
Monday, Sept. 8 - University of Manitoba Physics Department
... Order of magnitude is 10**2 or 100. (Powers can also be written as 10**x or 10^x) ...
... Order of magnitude is 10**2 or 100. (Powers can also be written as 10**x or 10^x) ...
superbubbles vs super-galactic winds
... assembled by several groups in order to predict the properties of stellar clusters, given an IMF and a stellar mass range. These are the so called synthesis models of starbursts (Mas-Hesse and Kunth 1991, Leitherer & Heckman 1995) which predict a variety of observable quantities, as well as the ener ...
... assembled by several groups in order to predict the properties of stellar clusters, given an IMF and a stellar mass range. These are the so called synthesis models of starbursts (Mas-Hesse and Kunth 1991, Leitherer & Heckman 1995) which predict a variety of observable quantities, as well as the ener ...
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.