Five Years of Swift Science: GRBs and More!
... • Target management database – MySQL database to automatically ingest target information from ToO requests, target lists from GI approved proposals and GRB information from GCN circulars • More highly automated TAKO software – will allow higher automation to XRT temperature control and ACS slew beha ...
... • Target management database – MySQL database to automatically ingest target information from ToO requests, target lists from GI approved proposals and GRB information from GCN circulars • More highly automated TAKO software – will allow higher automation to XRT temperature control and ACS slew beha ...
DTU Chap 16 Galaxies v2
... the Hubble law: recessional velocity = Ho x distance, where Ho is the Hubble constant. Astronomers use standard candles—Cepheid variables, the brightest supergiants, globular clusters, H II regions, supernovae in a galaxy, and the Tully-Fisher relation— to calculate intergalactic distances. Because ...
... the Hubble law: recessional velocity = Ho x distance, where Ho is the Hubble constant. Astronomers use standard candles—Cepheid variables, the brightest supergiants, globular clusters, H II regions, supernovae in a galaxy, and the Tully-Fisher relation— to calculate intergalactic distances. Because ...
The Large Synoptic Survey Telescope
... dN/dMdz constrains DE models via the dependences on the co-moving volume element, dV/dWdz, and on the exponential growth of structure, d(z). ...
... dN/dMdz constrains DE models via the dependences on the co-moving volume element, dV/dWdz, and on the exponential growth of structure, d(z). ...
Bildungskonzepte von Galaxien - uni
... Eccentricity increase with mass concentration Thus Angular momentum conserved Slow potential change: eccentricity is conserved, height above galactic plane Fast changing potential: more eccentric orbits, height spread ...
... Eccentricity increase with mass concentration Thus Angular momentum conserved Slow potential change: eccentricity is conserved, height above galactic plane Fast changing potential: more eccentric orbits, height spread ...
Crash Galaxies
... Effects of ‘ships in the night’ Gravitational tugs-of-war between galaxies can work wonders on galactic nuclei, ‘turning them on’ so to speak, stoking their fires to an unprecedented level of activity. As two galaxies slide closer together, their gravity can disrupt gas clouds that previously had be ...
... Effects of ‘ships in the night’ Gravitational tugs-of-war between galaxies can work wonders on galactic nuclei, ‘turning them on’ so to speak, stoking their fires to an unprecedented level of activity. As two galaxies slide closer together, their gravity can disrupt gas clouds that previously had be ...
PowerPoint
... Galaxies Are not Alone • Galaxies are not scattered randomly throughout the Universe • Galaxies are found in clusters – The Milky Way is part of the Local Group of about 40 galaxies ...
... Galaxies Are not Alone • Galaxies are not scattered randomly throughout the Universe • Galaxies are found in clusters – The Milky Way is part of the Local Group of about 40 galaxies ...
The mid- and far-infrared range - International Space Science Institute
... of CO occur at shorter wavelengths than low-J transitions and hence they probe warmer and denser gas. Likewise, as a hydride, H2 transitions occur at much shorter wavelengths than those of the heavier molecule CO. However, as a homonuclear molecule, H2 has only quadrupole-allowed transitions with mu ...
... of CO occur at shorter wavelengths than low-J transitions and hence they probe warmer and denser gas. Likewise, as a hydride, H2 transitions occur at much shorter wavelengths than those of the heavier molecule CO. However, as a homonuclear molecule, H2 has only quadrupole-allowed transitions with mu ...
Dark bursts - indico in2p3
... GRB 111215A, AVhost > 8.5m, Zauderer+ 2013). The combination of radio and X-ray data allows to robustly determine the required extinction, instead of simply assuming an optical to X-ray spectral index. Millimeter observations of afterglows with JVLA, ALMA, PdB IRAM etc. allow to determine subarcseco ...
... GRB 111215A, AVhost > 8.5m, Zauderer+ 2013). The combination of radio and X-ray data allows to robustly determine the required extinction, instead of simply assuming an optical to X-ray spectral index. Millimeter observations of afterglows with JVLA, ALMA, PdB IRAM etc. allow to determine subarcseco ...
Simulations of the galaxy population constrained by observations
... Supernova feedback was increased in low-mass galaxies, and environmental effects on satellites were treated more realistically. They also improved the tracking of angular momentum as material moves between the various gaseous and stellar components, allowing a better treatment of the sizes of disks ...
... Supernova feedback was increased in low-mass galaxies, and environmental effects on satellites were treated more realistically. They also improved the tracking of angular momentum as material moves between the various gaseous and stellar components, allowing a better treatment of the sizes of disks ...
arXiv:astro-ph/9909369 v1 22 Sep 1999
... This indicates that the non-linearity present in the general FIR-Hα relation is induced by the nuclear component and that in the disk of normal galaxies, the FIR emission collected by IRAS is mostly from dust heated by the young stellar population. 3. Starbursts in the infrared As already mentioned ...
... This indicates that the non-linearity present in the general FIR-Hα relation is induced by the nuclear component and that in the disk of normal galaxies, the FIR emission collected by IRAS is mostly from dust heated by the young stellar population. 3. Starbursts in the infrared As already mentioned ...
Invited Review The Beginning and Evolution of the Universe
... that at some point the temperature had been at least 109 K (and possibly as much as 1011 K). Chandrasekhar & Henrich (1942) performed the first detailed, correct equilibrium computation and concluded that no single set of temperature and density values can accommodate all the observed abundances; th ...
... that at some point the temperature had been at least 109 K (and possibly as much as 1011 K). Chandrasekhar & Henrich (1942) performed the first detailed, correct equilibrium computation and concluded that no single set of temperature and density values can accommodate all the observed abundances; th ...
Detection of isolated population III stars with the James Webb Space
... 1965) affects each emitted spectrum, resulting in huge absorption of radiation with wavelength lower than the Lymanα (Lyα) line. To simulate this we set all flux at wavelengths shorter than Lyα to zero at z > 6. For z < 6 the situation is more complicated as the radiation passes through several clou ...
... 1965) affects each emitted spectrum, resulting in huge absorption of radiation with wavelength lower than the Lymanα (Lyα) line. To simulate this we set all flux at wavelengths shorter than Lyα to zero at z > 6. For z < 6 the situation is more complicated as the radiation passes through several clou ...
Light rays, gravitational waves and pulse
... change in phase, since the wavevector is the gradient of the phase) and the electromagnetic field (and thus the amplitudes and polarizations). In all of these cases, the changes are determined partly by the geometry of the space–time the light propagates through, partly by the world lines of the emi ...
... change in phase, since the wavevector is the gradient of the phase) and the electromagnetic field (and thus the amplitudes and polarizations). In all of these cases, the changes are determined partly by the geometry of the space–time the light propagates through, partly by the world lines of the emi ...
Redshift
In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. In general, whether or not the radiation is within the visible spectrum, ""redder"" means an increase in wavelength – equivalent to a lower frequency and a lower photon energy, in accordance with, respectively, the wave and quantum theories of light.Some redshifts are an example of the Doppler effect, familiar in the change of apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles. A redshift occurs whenever a light source moves away from an observer. Another kind of redshift is cosmological redshift, which is due to the expansion of the universe, and sufficiently distant light sources (generally more than a few million light years away) show redshift corresponding to the rate of increase in their distance from Earth. Finally, gravitational redshift is a relativistic effect observed in electromagnetic radiation moving out of gravitational fields. Conversely, a decrease in wavelength is called blueshift and is generally seen when a light-emitting object moves toward an observer or when electromagnetic radiation moves into a gravitational field. However, redshift is a more common term and sometimes blueshift is referred to as negative redshift.Knowledge of redshifts and blueshifts has been applied to develop several terrestrial technologies such as Doppler radar and radar guns. Redshifts are also seen in the spectroscopic observations of astronomical objects. Its value is represented by the letter z.A special relativistic redshift formula (and its classical approximation) can be used to calculate the redshift of a nearby object when spacetime is flat. However, in many contexts, such as black holes and Big Bang cosmology, redshifts must be calculated using general relativity. Special relativistic, gravitational, and cosmological redshifts can be understood under the umbrella of frame transformation laws. There exist other physical processes that can lead to a shift in the frequency of electromagnetic radiation, including scattering and optical effects; however, the resulting changes are distinguishable from true redshift and are not generally referred to as such (see section on physical optics and radiative transfer).