AGN Science Collaboration - Active Galactic Nuclei Science
... AGN Dilution by Host Galaxy • Optical color selection of AGN is: - bias against AGN in SF galaxies - bias against low Eddington ratios • Selection bias can be partially overcome by: - variability (at least with nearby objects) - X-rays (not as deep as LSST) • LSST photometry / depth makes th ...
... AGN Dilution by Host Galaxy • Optical color selection of AGN is: - bias against AGN in SF galaxies - bias against low Eddington ratios • Selection bias can be partially overcome by: - variability (at least with nearby objects) - X-rays (not as deep as LSST) • LSST photometry / depth makes th ...
Gravity - RemoveTheVeil
... definition: Importance and serious consequence. Oh, gravity only applies to sufficiently massive objects, great! I’d go with the 2nd definition because if it weren’t for gravity, the Big Bang Theory would have never been proposed, nor would any of our current physics theories like Space-Time fabric ...
... definition: Importance and serious consequence. Oh, gravity only applies to sufficiently massive objects, great! I’d go with the 2nd definition because if it weren’t for gravity, the Big Bang Theory would have never been proposed, nor would any of our current physics theories like Space-Time fabric ...
Measurement of the dispersion of air and of refractive index
... Precise knowledge of the dispersion of light in air is crucial for accurate length interferometry [1,2], geodetic surveying [3] and ground-based astronomical observations [4], and it can be useful to measure pollution or humidity levels [5,6]. Phenomenological formulae allowing the calculation of th ...
... Precise knowledge of the dispersion of light in air is crucial for accurate length interferometry [1,2], geodetic surveying [3] and ground-based astronomical observations [4], and it can be useful to measure pollution or humidity levels [5,6]. Phenomenological formulae allowing the calculation of th ...
compound sentences
... B. 1. Connor had seen many parks in his life, but he never had seen a park like this one. 2. Dad brought a pair of binoculars, and Nate used them to look for animals. 3. He saw his first live bear, and the hair stood up on his arms. 4. It was an exciting moment, but it only lasted a second. 5. The b ...
... B. 1. Connor had seen many parks in his life, but he never had seen a park like this one. 2. Dad brought a pair of binoculars, and Nate used them to look for animals. 3. He saw his first live bear, and the hair stood up on his arms. 4. It was an exciting moment, but it only lasted a second. 5. The b ...
EbS97570
... Earth? So was it just the right elements, the right building blocks or was there more information in it when these comets arrived. ...
... Earth? So was it just the right elements, the right building blocks or was there more information in it when these comets arrived. ...
AN INTENSIVE HUBBLE SPACE TELESCOPE
... factor of ∼ 20 across the Hubble sequence from passive to irregular galaxies (Mannucci et al. 2005). Finally, Hamuy et al. (2000) and Takanashi et al. (2008) show that a subsample of elliptical-hosted SNe populates a much smaller area of colorstretch parameter space than the full sample of SNe. By t ...
... factor of ∼ 20 across the Hubble sequence from passive to irregular galaxies (Mannucci et al. 2005). Finally, Hamuy et al. (2000) and Takanashi et al. (2008) show that a subsample of elliptical-hosted SNe populates a much smaller area of colorstretch parameter space than the full sample of SNe. By t ...
Astronomy: A Day-time Activity
... Many educators/teachers who are apprehensive about offering astronomy sessions at night never think of doing astronomy activities during the day. Before attempting a night astronomy program it is worthwhile to understand and appreciate some principles of astronomy that are applicable during the ...
... Many educators/teachers who are apprehensive about offering astronomy sessions at night never think of doing astronomy activities during the day. Before attempting a night astronomy program it is worthwhile to understand and appreciate some principles of astronomy that are applicable during the ...
Star Map - Science Centre
... Located towards the South East of Orion’s belt is the brightest star in the sky, Sirius (scorching), belonging to the constellation Canis Major. Its brightness causes it to twinkle more than other stars as its light passes through our atmosphere. ...
... Located towards the South East of Orion’s belt is the brightest star in the sky, Sirius (scorching), belonging to the constellation Canis Major. Its brightness causes it to twinkle more than other stars as its light passes through our atmosphere. ...
Ultraluminous X-ray Sources in Andromeda Galaxy
... authors recovered a blue optical counterpart associated with this ULX, but prior to this ULX discovery, no massive/blue stars were found in that region. Rather, this region in M83 is dominated by red stars. The face-on galaxy, M83 has very well established population studies, which made these author ...
... authors recovered a blue optical counterpart associated with this ULX, but prior to this ULX discovery, no massive/blue stars were found in that region. Rather, this region in M83 is dominated by red stars. The face-on galaxy, M83 has very well established population studies, which made these author ...
The Helium Flash • When the temperature of a stellar core reaches T
... Note: the core mass at ignition is somewhat dependent on the star’s initial helium abundance, weakly dependent on its initial metallicity, and surprisingly insensitive to the star’s initial mass. In general, helium burning for all stars begins when the core reaches ∼ 0.45M⊙ . • Stars with degenerate ...
... Note: the core mass at ignition is somewhat dependent on the star’s initial helium abundance, weakly dependent on its initial metallicity, and surprisingly insensitive to the star’s initial mass. In general, helium burning for all stars begins when the core reaches ∼ 0.45M⊙ . • Stars with degenerate ...
Writing a superlattice with light forces
... standing light waves. For the λ/ 2 lattice, an interference pattern with four laser beams that were polarized perpendicular to the substrate plane was used. Another way of switching between these two lattice periods is to change the relative phase between the two standing light waves. In the situati ...
... standing light waves. For the λ/ 2 lattice, an interference pattern with four laser beams that were polarized perpendicular to the substrate plane was used. Another way of switching between these two lattice periods is to change the relative phase between the two standing light waves. In the situati ...
Laser Cooling to the Zero-Point Energy of Motion
... can be extracted from the ion. If the sideband absorption spectrum is probed with saturating power, the ratio of the strengths of lower to upper sidebands becomes independent of power' and directly gives (n„). To simplify our discussion, we have assumed the trap states and associated wave functions ...
... can be extracted from the ion. If the sideband absorption spectrum is probed with saturating power, the ratio of the strengths of lower to upper sidebands becomes independent of power' and directly gives (n„). To simplify our discussion, we have assumed the trap states and associated wave functions ...
Note - The Eclecticon of Dr French
... the focusing effect results from the observation that the total angle of deflection passes through an extremum as the angle between incidence and raindrop surface normal is varied. The large multitude of raindrops within a raincloud allows us to assume that all possible angles of are explored wi ...
... the focusing effect results from the observation that the total angle of deflection passes through an extremum as the angle between incidence and raindrop surface normal is varied. The large multitude of raindrops within a raincloud allows us to assume that all possible angles of are explored wi ...
HR 6060: The Closest Ever Solar Twin
... Be abundances. Its galactic orbit is also very similar to the Sun's. Yet its luminosity (HIPPARCOS), and thus its age, is very slightly higher than the Sun's: its abundance pattern, also, is curiously non-solar. Additionally, we have inferred a new, very precise solar (B-V) from the database of our ...
... Be abundances. Its galactic orbit is also very similar to the Sun's. Yet its luminosity (HIPPARCOS), and thus its age, is very slightly higher than the Sun's: its abundance pattern, also, is curiously non-solar. Additionally, we have inferred a new, very precise solar (B-V) from the database of our ...
Plasma in ionosphere
... the surface of the Earth. Ionization here is due to Lyman series-alpha hydrogen radiation at a wavelength of 121.5 nanometer (nm) ionizing nitric oxide (NO). In addition, when the sun is active with 50 or more sunspots, hard X-rays (λ < 1 nm) ionize the air (N 2, O2). During the night time, cosmic r ...
... the surface of the Earth. Ionization here is due to Lyman series-alpha hydrogen radiation at a wavelength of 121.5 nanometer (nm) ionizing nitric oxide (NO). In addition, when the sun is active with 50 or more sunspots, hard X-rays (λ < 1 nm) ionize the air (N 2, O2). During the night time, cosmic r ...
Expanding the Catalog: Considering the Importance
... for burning in the core. For our highest mass stars that develop convective cores the extent of the convective core changes slightly due to the change in electron fraction (the convective core is high enough in temperature to be dominated by electron scattering opacity) and the energy generation by ...
... for burning in the core. For our highest mass stars that develop convective cores the extent of the convective core changes slightly due to the change in electron fraction (the convective core is high enough in temperature to be dominated by electron scattering opacity) and the energy generation by ...
Chapter 2 Matter and Change
... Mixtures are a physical blend of at least two substances; have variable composition. They can be either: 1) Heterogeneous – the mixture is not uniform in composition • Chocolate chip cookie, gravel, soil. 2) Homogeneous - same composition throughout; called “solutions” • Kool-aid, air, salt water ...
... Mixtures are a physical blend of at least two substances; have variable composition. They can be either: 1) Heterogeneous – the mixture is not uniform in composition • Chocolate chip cookie, gravel, soil. 2) Homogeneous - same composition throughout; called “solutions” • Kool-aid, air, salt water ...
Chapter 2 Matter and Change
... Mixtures are a physical blend of at least two substances; have variable composition. They can be either: 1) Heterogeneous – the mixture is not uniform in composition • Chocolate chip cookie, gravel, soil. 2) Homogeneous - same composition throughout; called “solutions” • Kool-aid, air, salt water ...
... Mixtures are a physical blend of at least two substances; have variable composition. They can be either: 1) Heterogeneous – the mixture is not uniform in composition • Chocolate chip cookie, gravel, soil. 2) Homogeneous - same composition throughout; called “solutions” • Kool-aid, air, salt water ...
A propelling neutron star in the enigmatic Be-star γ Cassiopeia
... ). It can be made much ∼v07 ) and to binary orbital period (as ∼Porb longer than the characteristic spin-down time at the propeller stage during the disc accretion on to the NS with the same magnetospheric ...
... ). It can be made much ∼v07 ) and to binary orbital period (as ∼Porb longer than the characteristic spin-down time at the propeller stage during the disc accretion on to the NS with the same magnetospheric ...
Astronomical spectroscopy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition, temperature, density, mass, distance, luminosity, and relative motion using Doppler shift measurements.