Quasars or quasi-stellar radio sources are the most energetic and distant
members of a class of .... Quasars inhabit the very center of active, young
galaxies, and are among the most luminous, power...
Active galactic nuclei (AGN) involve the most powerful, steady sources of
luminosity in ... Causality implies that an object that varies rapidly in time t must
be smaller than the ... High luminosities imply high masses such that gravity can
combat radiation ... The gravitational energy liberated during accretion onto a
black hole is ...
Some of these active galactic nuclei (AGN) make more energy than the ...
Categories of AGN include Seyfert galaxies, radio galaxies, and quasars, ... the
broad lines imply that the gas producing them must be moving at a large range of
velocities. ... For example, if its output varies substantially in one month, the
source is ...
Active galaxies typically look like galaxies, whereas quasars are often so ...
periods of time has shown that the energy emission often varies over time. ...
These rather rapid fluctuations lead us to conclude that the source of energy ....
Thus, even neglecting its nonstellar spectrum, the total energy output of an active
Abstract Quasars emit more energy than any other objects in the universe, yet ...
of its host galaxy, such as the total mass in stars, but the origin of this relation and
the role .... of radiation at or near their centers, called active galactic nuclei .
The .... argument suggests that the size of the most rapidly varying quasars mu...
An active galaxy may be regarded as a normal galaxy plus an AGN with its .....
The broad lines imply that the gas must be either extremely hot or in rapid motion.
... indicate the maximum and minimum in regions where the flux density varies ....
Figure 10: The spectral energy distribution of an active galaxy, the quasar 3C 273
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
Dec 1, 2008 ... 1984), in its modern, dark energy dominated (ΛCDM) incarnation, provides ... hot
gas in clusters similarly imply that this gas should have short cooling times, ... or
stellar mass of a galaxy and the mass of its DM halo varies strongly and .... and
rapid black hole accretion associated with ULIRGS and quasars ...
Universe from the Herschel Radio Galaxy Evolution Project ... Key words.
galaxies: active – quasars: general – galaxies: high-redshift ... the nature of the IR
spectral energy distribution (SED) can be ..... was deblended to remove its
contribution from the radio galaxy .... Interestingly, such luminous objects imply
Jun 11, 2014 ... Key words: galaxies: active / quasars: general / galaxies: ... the nature of the IR
spectral energy distribution (SED) can be used to probe .... it was deblended to
remove its contribution from the radio galaxy flux (see Sect. .... Interestingly, such
luminous objects imply strong AGN and/or star formation activities.