Clusters of Galaxies
... or centrally dominant galaxy (Morgan and Osterbrock 1969) which is very seldom, if ever found outside of clusters. " • There were also an unusual type of radio source found primarily in clusters, a so-called WAT, or wide angle tailed source (Owen and Rudnick 1976) . " • first indications of cluste ...
... or centrally dominant galaxy (Morgan and Osterbrock 1969) which is very seldom, if ever found outside of clusters. " • There were also an unusual type of radio source found primarily in clusters, a so-called WAT, or wide angle tailed source (Owen and Rudnick 1976) . " • first indications of cluste ...
Constraining Star-Formation History in SN Ia Host Galaxies Using
... galaxies and find that ~ 30% of them are actively star-forming Further analysis is needed to investigate sources of error and estimate uncertainties on stellar masses and SFRs Even with just 4 fit parameters, degeneracies in the models exist and can affect best-fit determinations and derived par ...
... galaxies and find that ~ 30% of them are actively star-forming Further analysis is needed to investigate sources of error and estimate uncertainties on stellar masses and SFRs Even with just 4 fit parameters, degeneracies in the models exist and can affect best-fit determinations and derived par ...
Forman - Chandra X
... optically thin) - Observed in high state galactic black holes -X-rays from inverse Compton in RIAF -Little optical or UV since no disk at small radii - model requires L/Ledd < 0.03 ...
... optically thin) - Observed in high state galactic black holes -X-rays from inverse Compton in RIAF -Little optical or UV since no disk at small radii - model requires L/Ledd < 0.03 ...
The SCUBA-2 Cosmology Legacy Survey: blank
... observation, scaling the data to units of pW. The signal recorded by each bolometer is then assumed to be a linear combination of: (a) a common mode signal dominated by atmospheric water and ambient thermal emission; (b) the astronomical signal (attenuated by atmospheric extinction) and finally (c) ...
... observation, scaling the data to units of pW. The signal recorded by each bolometer is then assumed to be a linear combination of: (a) a common mode signal dominated by atmospheric water and ambient thermal emission; (b) the astronomical signal (attenuated by atmospheric extinction) and finally (c) ...
The density structure around quasars from optical depth statistics
... 2–3 observed with the Ultraviolet and Visible Echelle Spectrograph (UVES) at the VLT-UT2 Kueyen European Southern Observatory telescope. These quasars do not show signatures of associated absorption and have a mean monochromatic luminosity of 5.4 × 1031 h −2 erg s−1 Hz−1 at the Lyman limit. The obse ...
... 2–3 observed with the Ultraviolet and Visible Echelle Spectrograph (UVES) at the VLT-UT2 Kueyen European Southern Observatory telescope. These quasars do not show signatures of associated absorption and have a mean monochromatic luminosity of 5.4 × 1031 h −2 erg s−1 Hz−1 at the Lyman limit. The obse ...
슬라이드 1
... have much more accurate information than ever about recent star formation (RSF) histories of early-type galaxies in the local universe (z < 0.2). ...
... have much more accurate information than ever about recent star formation (RSF) histories of early-type galaxies in the local universe (z < 0.2). ...
Extending the Supermassive Black Hole Mass
... referred to as active galactic nuclei (AGN). Although AGN properties vary widely from class to Fig. 1. — Illustration of the basic structure class, AGN are known to generate enormous of AGN (not to scale). Image credit to Southamounts of radiative energy in a compact region of ampton Gamma-ray Astro ...
... referred to as active galactic nuclei (AGN). Although AGN properties vary widely from class to Fig. 1. — Illustration of the basic structure class, AGN are known to generate enormous of AGN (not to scale). Image credit to Southamounts of radiative energy in a compact region of ampton Gamma-ray Astro ...
A Massive Galaxy in its Core Formation Phase Three Billion Years
... universe. This high column density of gas in conjunction with the abundance of metals implies28 a very high extinction: AV & 100 for a screen, and AV & 6 if the dust and the stars are mixed. The detection of rest-frame optical flux, and of Hα emission, are inconsistent with such high values. The dus ...
... universe. This high column density of gas in conjunction with the abundance of metals implies28 a very high extinction: AV & 100 for a screen, and AV & 6 if the dust and the stars are mixed. The detection of rest-frame optical flux, and of Hα emission, are inconsistent with such high values. The dus ...
Action-at-a-Distance and Local Action in Gravitation
... 2. Action-at-a-Distance: Historical and Recent Discussion i. Newton’s Position Contrary to what is often believed, Newton did not think gravitation to be an AAAD effect. He frequently expressed his objection to viewing it as an inherent property of mass systems. He sympathized the æther viewpoint an ...
... 2. Action-at-a-Distance: Historical and Recent Discussion i. Newton’s Position Contrary to what is often believed, Newton did not think gravitation to be an AAAD effect. He frequently expressed his objection to viewing it as an inherent property of mass systems. He sympathized the æther viewpoint an ...
Transverse and Longitudinal Correlation Functions in the
... obtained (FORS is not sufficiently sensitive below 3 500 Å); (4) the redshift difference should be smaller than ∆ z ~ 0.5 (for most of them 0.3) to maximise the wavelength range over which correlations can be studied. There are 22 quasar pairs in the 2dF survey which meet our criteria of which we ob ...
... obtained (FORS is not sufficiently sensitive below 3 500 Å); (4) the redshift difference should be smaller than ∆ z ~ 0.5 (for most of them 0.3) to maximise the wavelength range over which correlations can be studied. There are 22 quasar pairs in the 2dF survey which meet our criteria of which we ob ...
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).