Measuring Starlight Deflection during the 2017 Eclipse: Repeating
... Albert Einstein published his theory of general relativity in 1915, and soon made the startling prediction that the sun’s gravity would deflect light twice as much as Newtonian physics indicated. He calculated that the deflection of light from a star appearing just at the edge of the sun would be ab ...
... Albert Einstein published his theory of general relativity in 1915, and soon made the startling prediction that the sun’s gravity would deflect light twice as much as Newtonian physics indicated. He calculated that the deflection of light from a star appearing just at the edge of the sun would be ab ...
Cosmic variance in [O/Fe] in the Galactic disk
... elements is several times larger and in all cases clearly higher than the measurement uncertainties. For the α-elements Mg, Si, S, and Ti, Nissen found a tight correlation between their abundance ratio to iron and stellar age, inferred from the comparison with models of stellar structure and evoluti ...
... elements is several times larger and in all cases clearly higher than the measurement uncertainties. For the α-elements Mg, Si, S, and Ti, Nissen found a tight correlation between their abundance ratio to iron and stellar age, inferred from the comparison with models of stellar structure and evoluti ...
get ready for rtmc may 26-28th!
... clear enough skies next year that we’ll have a fair shot at doing the entire Messier catalog in one night! Reminder on the Weeds at Anza… We had a pretty dry winter, up to March, but the Anza area got a lot of rain in March and April. That means that, while we didn’t get much weed growth over most o ...
... clear enough skies next year that we’ll have a fair shot at doing the entire Messier catalog in one night! Reminder on the Weeds at Anza… We had a pretty dry winter, up to March, but the Anza area got a lot of rain in March and April. That means that, while we didn’t get much weed growth over most o ...
Arguments for the presence of a distant large undiscovered Solar
... the Sun for the first time after perturbation by the unknown object. If this is the case, then examination of the aphelion longitudes and periods of the comets in Table 1 might give a clue to the present position of the object. The longitude Lh of the hypothetical planet may be taken, to a first app ...
... the Sun for the first time after perturbation by the unknown object. If this is the case, then examination of the aphelion longitudes and periods of the comets in Table 1 might give a clue to the present position of the object. The longitude Lh of the hypothetical planet may be taken, to a first app ...
Arguments for the presence of a distant large
... the Sun for the first time after perturbation by the unknown object. If this is the case, then examination of the aphelion longitudes and periods of the comets in Table 1 might give a clue to the present position of the object. The longitude Lh of the hypothetical planet may be taken, to a first app ...
... the Sun for the first time after perturbation by the unknown object. If this is the case, then examination of the aphelion longitudes and periods of the comets in Table 1 might give a clue to the present position of the object. The longitude Lh of the hypothetical planet may be taken, to a first app ...
Arguments for the presence of a distant large undiscovered Solar
... the Sun for the first time after perturbation by the unknown object. If this is the case, then examination of the aphelion longitudes and periods of the comets in Table 1 might give a clue to the present position of the object. The longitude Lh of the hypothetical planet may be taken, to a first app ...
... the Sun for the first time after perturbation by the unknown object. If this is the case, then examination of the aphelion longitudes and periods of the comets in Table 1 might give a clue to the present position of the object. The longitude Lh of the hypothetical planet may be taken, to a first app ...
The Components of a Spiral Galaxy
... definition of surface density Σ=L/r" • If all galaxies are alike and have the same surface densities L~r2" • Further if M/L is constant M~L" • a little algebra gives L~vc2L1/2~vc4" ...
... definition of surface density Σ=L/r" • If all galaxies are alike and have the same surface densities L~r2" • Further if M/L is constant M~L" • a little algebra gives L~vc2L1/2~vc4" ...
Luminosity, Flux and Magnitudes Outline
... h = Planck’s constant, k = Boltzmann’s constant, c = speed of light This is the power radiated per unit area in the frequency range to + d into a unit solid angle (d = d sin d in spherical ...
... h = Planck’s constant, k = Boltzmann’s constant, c = speed of light This is the power radiated per unit area in the frequency range to + d into a unit solid angle (d = d sin d in spherical ...
P1 The Earth in the Universe
... Scientists discovered 50 years later that the Earth generates massive amounts of heat through radioactive decay in the core. This heat generated convection currents in the mantle causing the crust to move. ...
... Scientists discovered 50 years later that the Earth generates massive amounts of heat through radioactive decay in the core. This heat generated convection currents in the mantle causing the crust to move. ...
Galaxy evolution - Pontifical Academy of Sciences
... of the halos are tightly linked to the density of the Universe at the time the halos were formed, disk galaxies are expected to grow with cosmic time. For reviews and books on this subject, see Avila-Rees 2006; Kormendy & Kennicutt 2004; Spinrad 2005; Keel 2002. In this paper I would like to address ...
... of the halos are tightly linked to the density of the Universe at the time the halos were formed, disk galaxies are expected to grow with cosmic time. For reviews and books on this subject, see Avila-Rees 2006; Kormendy & Kennicutt 2004; Spinrad 2005; Keel 2002. In this paper I would like to address ...
The Evening Sky Map
... Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to each other in the sky; either linked by gravity so that they orbit each other (binary star) or lying at different distances from Earth (optical double). Apparent separation of stars is given in ...
... Diffuse Nebula – A cloud of gas illuminated by nearby stars. Double Star – Two stars that appear close to each other in the sky; either linked by gravity so that they orbit each other (binary star) or lying at different distances from Earth (optical double). Apparent separation of stars is given in ...
Axions and White Dwarfs
... and R and T are the stellar radius and the temperature at the region of period formation, respectively. This equation reflects the fact that, as the star cools down, the degeneracy of the plasma increases, the buoyancy decreases, the Brunt-Väisälä frequency becomes smaller and, as a consequence, ...
... and R and T are the stellar radius and the temperature at the region of period formation, respectively. This equation reflects the fact that, as the star cools down, the degeneracy of the plasma increases, the buoyancy decreases, the Brunt-Väisälä frequency becomes smaller and, as a consequence, ...
Evolutionary properties of galaxies and mass assembly up
... the galaxy LF enters only through the conditional halo mass function n(M | ) and therefore the slope of the LF is approximately constant in different environments, while M* is brighter in over-dense environments. If this is the correct explanation, it has to be checked if these environmental effect ...
... the galaxy LF enters only through the conditional halo mass function n(M | ) and therefore the slope of the LF is approximately constant in different environments, while M* is brighter in over-dense environments. If this is the correct explanation, it has to be checked if these environmental effect ...
Lensing Magnification: A novel method to weigh high
... redshift for each data set beyond which magnification becomes more powerful than shear because ellipticity measurements become impossible. This is the case with clusters at z & 0.8 where very few galaxies with reliable shape measurements are available at redshift higher than the cluster redshift, as ...
... redshift for each data set beyond which magnification becomes more powerful than shear because ellipticity measurements become impossible. This is the case with clusters at z & 0.8 where very few galaxies with reliable shape measurements are available at redshift higher than the cluster redshift, as ...
Ten Years Of XMM-Newton: Scientific Achievements And Future Prospects Norbert Schartel
... Combined data-set will allow precise calibration of the mass/Sunyaev-Zel’dovich relation, thereby providing completely independent constraints on cosmological parameters ...
... Combined data-set will allow precise calibration of the mass/Sunyaev-Zel’dovich relation, thereby providing completely independent constraints on cosmological parameters ...
Radio galaxies are
... Time since the GW “kick” (from the velocity and the QSO offset): ~5 Myr We know the age of the AGN from radio observations: ~1 x105 years (Murgia et al. 1999) ...
... Time since the GW “kick” (from the velocity and the QSO offset): ~5 Myr We know the age of the AGN from radio observations: ~1 x105 years (Murgia et al. 1999) ...
01_test_bank
... C) Although most stars move through the sky, the brightest stars do not, and these are the ones that trace the patterns we see in the constellations. D) The stars in our sky actually move rapidly relative to us—thousands of kilometers per hour—but are so far away that it takes a long time for this m ...
... C) Although most stars move through the sky, the brightest stars do not, and these are the ones that trace the patterns we see in the constellations. D) The stars in our sky actually move rapidly relative to us—thousands of kilometers per hour—but are so far away that it takes a long time for this m ...
Neutrino hot dark matter and hydrodynamics of structure formation
... • Extreme Scattering Events: Earth-Jovian gas clouds observed in radio. Walker&Wardle 98: May be good fraction of galactic mass • Multiple imaging of pulsars: by MBDs in Jeans clusters • Explanation of H-alpha forest absorption lines ...
... • Extreme Scattering Events: Earth-Jovian gas clouds observed in radio. Walker&Wardle 98: May be good fraction of galactic mass • Multiple imaging of pulsars: by MBDs in Jeans clusters • Explanation of H-alpha forest absorption lines ...
Summer Sky Tour
... That was used by ancient Greek and Arab armies as an eye test. Some see them as a horse & rider. The Europeans saw the handle of the dipper as the tail of the Great Bear. Since bears don't have tails they danced around it by explaining that when the gods lifted the bear to the sky the tail got stre ...
... That was used by ancient Greek and Arab armies as an eye test. Some see them as a horse & rider. The Europeans saw the handle of the dipper as the tail of the Great Bear. Since bears don't have tails they danced around it by explaining that when the gods lifted the bear to the sky the tail got stre ...
Harvesting ALFALFA: Discovering Galaxies in the Pisces
... A small % of high S/N ALFALFA sources are spurious Consistent with simulations of reliability (Saintonge, 2007) and cut-off adopted (S/N > 6.5) Majority of high S/N galaxies without an OC are real Some are tidal remnants, some “almost dark” galaxies ...
... A small % of high S/N ALFALFA sources are spurious Consistent with simulations of reliability (Saintonge, 2007) and cut-off adopted (S/N > 6.5) Majority of high S/N galaxies without an OC are real Some are tidal remnants, some “almost dark” galaxies ...
Hertzsprung Rusell Diagram KLT
... Stars that look to us as though they are near each other, may intact be very far away from each other. Distant but very bright stars look similar to close but dim stars. ...
... Stars that look to us as though they are near each other, may intact be very far away from each other. Distant but very bright stars look similar to close but dim stars. ...
Stellar Temperatures
... There is a great variety of stellar absorption lines; the strength of any individual line is determine by the star’s • Temperature (most important) • Gravity • Abundance Historically, stellar spectral types have been classified using letters; the temperature sequence is (hot-to-cool) O-B-A-F-G-K- ...
... There is a great variety of stellar absorption lines; the strength of any individual line is determine by the star’s • Temperature (most important) • Gravity • Abundance Historically, stellar spectral types have been classified using letters; the temperature sequence is (hot-to-cool) O-B-A-F-G-K- ...
The birth of stars and planets - School of Physics
... for those who’d like to know more about the subject. It’s written by two experts in the field, is entirely non-technical, and has fantastic illustrations all the way through. • “The Story of the Solar System” by Mark Garlick (Cambridge, 2002) is by that rarest of creatures, an artist who is also a s ...
... for those who’d like to know more about the subject. It’s written by two experts in the field, is entirely non-technical, and has fantastic illustrations all the way through. • “The Story of the Solar System” by Mark Garlick (Cambridge, 2002) is by that rarest of creatures, an artist who is also a s ...
"Seeing" Dark Matter
... same for galaxy clusters as it does for smaller systems, like binary stars, the Solar System, or apples falling from trees. Either solution could deliver the additional force needed to hold a cluster together. Since Zwicky’s work, dark matter has remained a mystery. Is it real? What is it? Or is the ...
... same for galaxy clusters as it does for smaller systems, like binary stars, the Solar System, or apples falling from trees. Either solution could deliver the additional force needed to hold a cluster together. Since Zwicky’s work, dark matter has remained a mystery. Is it real? What is it? Or is the ...
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.