EVOLUTION OF THE QUASAR POPULATION AT HIGH REDSHIFT
... High-redshift (z ∼ 6) quasars have been served as cosmological probes for studying the early universe. They provide crucial information on the growth of massive black holes (BHs) and formation of galaxies in the first billion years. I focus my dissertation work on exploring various properties of qua ...
... High-redshift (z ∼ 6) quasars have been served as cosmological probes for studying the early universe. They provide crucial information on the growth of massive black holes (BHs) and formation of galaxies in the first billion years. I focus my dissertation work on exploring various properties of qua ...
this article
... 15 foreground stars common to both images. This scale factor, however, often needs adjustments, since the foreground stars and the galaxy are sometimes different in color. Adjustments were made iteratively until a satisfactory subtraction was obtained for the majority of the galaxy. The application ...
... 15 foreground stars common to both images. This scale factor, however, often needs adjustments, since the foreground stars and the galaxy are sometimes different in color. Adjustments were made iteratively until a satisfactory subtraction was obtained for the majority of the galaxy. The application ...
X-ray binaries in the Milky Way and other galaxies
... 6.1. Universal HMXB Luminosity Function ? . . . . . . . . . . . . . . . . . . . 6.2. High Luminosity cut-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3. Total X-ray luminosity as SFR indicator . . . . . . . . . . . . . . . . . . . 6.4. Theoretical LX –SFR relation . . . . . . . . . ...
... 6.1. Universal HMXB Luminosity Function ? . . . . . . . . . . . . . . . . . . . 6.2. High Luminosity cut-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3. Total X-ray luminosity as SFR indicator . . . . . . . . . . . . . . . . . . . 6.4. Theoretical LX –SFR relation . . . . . . . . . ...
arXiv:astro-ph/0702414v1 15 Feb 2007
... by the atmosphere, was performed using spectra of standard stars obtained during the same night. The wavelength calibration was verified and, if necessary, corrected by determining the position of sky lines. The one-dimensional spectra were then co-added according to their weighted signal-to-noise. ...
... by the atmosphere, was performed using spectra of standard stars obtained during the same night. The wavelength calibration was verified and, if necessary, corrected by determining the position of sky lines. The one-dimensional spectra were then co-added according to their weighted signal-to-noise. ...
IDEA MAN
... War, Zwicky used his Aerojet connections to place an experiment aboard a captured V-2 rocket. Zwicky wanted to use shaped charges similar to the explosives used in Army bazookas to generate jets of liquid metal traveling at up to seven miles per second. Earthbound observatories could then photograph ...
... War, Zwicky used his Aerojet connections to place an experiment aboard a captured V-2 rocket. Zwicky wanted to use shaped charges similar to the explosives used in Army bazookas to generate jets of liquid metal traveling at up to seven miles per second. Earthbound observatories could then photograph ...
Th`ese d`astrophysique Chemodynamical Simulations of Evolution
... Numerical simulations are a useful tool to understand the complex and non-linear behaviour of galaxies. By using simple N-body calculations they increase our understanding of simple stellar systems like globular clusters or the (dark matter) history of our universe. Chemodynamical simulations are de ...
... Numerical simulations are a useful tool to understand the complex and non-linear behaviour of galaxies. By using simple N-body calculations they increase our understanding of simple stellar systems like globular clusters or the (dark matter) history of our universe. Chemodynamical simulations are de ...
University of Groningen Late-type spiral galaxies Ganda, Katia
... whose formation and evolutionary pattern are not properly understood yet. Carollo et al. (2007) also performed a population analysis on nine late-type spiral galaxies (types between Sa and Sc) on the basis of HST ACS and NICMOS optical and near-infrared colours. The high spatial resolution of their ...
... whose formation and evolutionary pattern are not properly understood yet. Carollo et al. (2007) also performed a population analysis on nine late-type spiral galaxies (types between Sa and Sc) on the basis of HST ACS and NICMOS optical and near-infrared colours. The high spatial resolution of their ...
Local Universe Supernovae and Their Host Galaxies
... • Corotation radius: The radius in which angular velocity of forming spiral arm density wave and the galactic disk are equal. ...
... • Corotation radius: The radius in which angular velocity of forming spiral arm density wave and the galactic disk are equal. ...
The Spatial Distribution of Satellite Galaxies Ing´olfur ´ Ag´ ustsson
... Host galaxies and their satellites are selected from large observational surveys via proximity criteria which are implemented in redshift space, not real space. In other words, satellite galaxies are selected to be faint objects that are located “close to” bright objects, both in projected radial di ...
... Host galaxies and their satellites are selected from large observational surveys via proximity criteria which are implemented in redshift space, not real space. In other words, satellite galaxies are selected to be faint objects that are located “close to” bright objects, both in projected radial di ...
APS Neutrino Study
... its effects on big-bang nucleosynthesis, the cosmic microwave background, and the large-scale structure of galaxies; in particular, weak gravitational lensing techniques offer a very realistic and exciting possibility of measuring neutrino masses down to the scale indicated by neutrino oscillations. ...
... its effects on big-bang nucleosynthesis, the cosmic microwave background, and the large-scale structure of galaxies; in particular, weak gravitational lensing techniques offer a very realistic and exciting possibility of measuring neutrino masses down to the scale indicated by neutrino oscillations. ...
Weak gravitational lensing
While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak lensing regime, in which the deflection is impossible to detect in a single background source. However, even in these cases, the presence of the foreground mass can be detected, by way of a systematic alignment of background sources around the lensing mass. Weak gravitational lensing is thus an intrinsically statistical measurement, but it provides a way to measure the masses of astronomical objects without requiring assumptions about their composition or dynamical state.