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Power Source for Active Galaxies and Quasars - Astronomy Notes

www.astronomynotes.com/galaxy/s14.htm

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 ...

The Sound of Galaxies - Hogwarts is Here

www.hogwartsishere.com/courses/ASTR-301/lesson/375/

Most of a normal galaxy's energy is emitted in, or near, the visible portion of the ... the light we see from a normal galaxy is just the accumulated light of its many stars. In contrast, most active galaxies do emit substantial amounts of visible radiation ... Seyfert Galaxies and Radio Galaxies and the even more luminous Quasars.

Active Galaxies and Quasars - Introduction - Imagine the Universe!

imagine.gsfc.nasa.gov/science/objects/active_galaxies1.html

The energy emitted by an active galaxy, AGN for short, is anything but normal. So what is happening in these galaxies to produce such an energetic output? ... In an active galaxy, its supermassive black hole is accreting material from the ...

Chapter 25

staff.on.br/jlkm/astron2e/AT_MEDIA/CH25/CHAP25AT.HTM

Active galaxies typically look like galaxies, whereas quasars are often so ... periods of time has shown that the energy emission often varies over time. .... Astronomers reason that this object is moving rapidly through space, trailing a ... Thus, even neglecting its nonstellar spectrum, the total energy output of an active galaxy ...

Introduction to active galaxies: View as single page

www.open.edu/openlearn/ocw/mod/oucontent/view.php?printable=1&id=2462

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  ...

Supermassive Black Holes

arxiv.org/pdf/0705.1537

May 10, 2007 ... 3C 273's total optical output varies significantly in only 10 months or so ... view now is that quasars are found in galaxies with active, ... the rate at which matter is converted into energy can be as high as 10 solar ... its own right, without having passed through the rapid accretion .... The implied central mas...

Chapter 3: Insights in lines and dots

ccnmtl.columbia.edu/projects/mmt/frontiers/web/ch3.html

[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 ...

Radiative efficiency, variability and Bondi accretion on to massive ...

mnras.oxfordjournals.org/content/432/1/530.full

Apr 11, 2013 ... We find no significant change in the spectral energy distribution as a ... With this realization, the exploration and understanding of active galactic nuclei (AGN) has taken a .... of nuclear power output with nuclear accretion rate (Falcke et al. ... obscured quasar with most of its bolometric luminosity emerging in ...

Coherent plasma processes in active galactic nuclei - SciELO

www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332002000500018

The physics of active galactic nuclei (AGN) and related objects is one of the most ... Thus the output of a quasars is much more than that of an entire galaxy. ... Further, the observed rapid time (tn) variability of the radiation constrains the size .... For a power law energy distribution of electrons, synchrotron radiation flux also...

High-redshift quasars and the supermassive black hole mass budget

mnras.oxfordjournals.org/content/350/2/456.full

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...