Jun 12, 2010 ... The gravitational potential energy you had above the ground was ... The amount
of mass needed to power the nuclei in active galaxies is from ... The number of
quasars peaks at a time when the universe was about 20% of its ...
Active galaxies typically look like galaxies, whereas quasars are often so ... Thus,
the broadening indicates rapid internal motion in the nucleus. ... over long
periods of time has shown that the energy emission often varies over time. .....
Thus, even neglecting its nonstellar spectrum, the total energy output of an active
An active galaxy may be regarded as a normal galaxy plus an AGN with its .....
star because cool giant stars dominate the luminous output of the galaxy. ... The
broad lines imply that the gas must be either extremely hot or in rapid motion. ....
Figure 10: The spectral energy distribution of an active galaxy, the quasar 3C 273
May 1, 2004 ... 1998) has observed over 650 confirmed quasars in the redshift range 3.0 ≲z <
5.7 (Schneider et al. ... observations of quasars and other active galactic nuclei (
AGN) in ... 'mass budget' implied by the estimated local SMBH mass density. .....
terms of the fraction ɛ of its total rest mass energy that is libera...
This last object is noteworthy because its Mg ii and Al iii lines absorb down to
almost zero flux ... The velocity at which C iv absorption begins varies from object
to object. .... equilibrium is well justifled for photoionized clouds in active galaxies.
.... H I photoionization cross section decreases rapidly with photon energy ( x v ...
Its normalization varies strongly with mass, as M~5 or M~; this scaling only ... in
massive galaxies, with the fraction of AGN decreasing rapidly below a stellar
mass ... This process can lead to very efficient coupling ofthejet kinetic energy
output of .... objects classified as 'quasars' by the automated SDSS classification
[4:] Quasars are fascinating objects that generate the energy of a thousand trillion
... "z" in Rick's note) implied that the quasar had to be intrinsically very luminous,
outshining the combined light of the hundreds of billions of stars in its host galaxy
. ... One of the more valuable eye-brain processing systems allows ...
Mar 1, 2010 ... We consider H1821+643 in the context of a unified active galactic nucleus ...
However, the large reservoir of cool gas implied by this cooling flow model ... for '
radio-quiet' quasars (at only 10<sup>23.9</sup> W Hz<sup>−1</sup> sr<sup>−1</sup>) and its 151 MHz radio .... The
2.0– 5.0 keV energy band was therefore used to estimate the radial ...
quasars, active galaxies, and gamma-ray bursts. 333 .... of it or its emitted
radiation escape carrying energy and angu- lar momentum ..... than most other
sources at all wavelengths, varies substantially in time ... The huge energy output
, large redshifts, and jets and other structure ..... How rapidly matter is accreting
The high-energy non-stellar activity in some galactic nuclei seems even more
mysterious. ... this implied that quasars were much more luminous than ordinary
galaxies, and ... Rapidly variable X-rays could be either synchrotron-type
radiation, ... when its power output (derived primarily from gravitational binding