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Quasar

en.wikipedia.org/wiki/Quasar

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...

Quasars - Utk

csep10.phys.utk.edu/astr162/lect/active/quasars.html

We now believe quasars and active galaxies to be related phenomena, and that their ... Quasar Redshifts Imply Enormous Distance and Energy Output ... from them was produced when the Universe was only one tenth of its present age.

Active galactic nuclei - NCBI - National Institutes of Health

www.ncbi.nlm.nih.gov/pmc/articles/PMC33567/

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 ...

Active Galactic Nuclei - University of Arizona

ircamera.as.arizona.edu/NatSci102/NatSci/lectures/agns.htm

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 ...

The odd couple: quasars and black holes

arxiv.org/pdf/1407.6363

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 [4]. The .... argument suggests that the size of the most rapidly varying quasars mu...

Starburst Forums: Subquantum Kinetics | Discussion of Cutting Edge ...

starburstfound.org/sqkblog/?paged=2

Jun 23, 2011 ... If its redshift is entirely cosmological, this galaxy would be existing at just 400 ... heating effect of the radiation output from quasars and active galactic nuclei. ... So, in the big bang cosmology this energy density increase would have to .... where M is stellar mass and R is stellar radius and redshift z varies i...

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. ... 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 galaxy ...

Galactic Monsters - StarDate's Black Hole Encyclopedia

blackholes.stardate.org/resources/article.php?p=galactic-monsters

In 1963, soon after the discovery of quasi-stellar radio sources, or quasars, ... Throughout the 1950s and '60s, the field progressed rapidly as more and more ... Seyfert galaxies, and quasars collectively are known as active galactic nuclei ( AGNs). ... The escape velocity from the surface of an object depends on both its mass ...

SUPERMASSIVE BLACK HOLES IN ACTIVE GALACTIC NUCLEI1

cds.cern.ch/record/432129/files/0003267.pdf

general phenomenon of active galactic nuclei (AGNs). ... First, a lower limit to the total energy output of a quasar is the energy, ∼ 10. 61 erg, ... has appeared: the objects that vary most rapidly are now thought to contain relativistic jets that are beamed ... arguments then imply that typical remnant masses are M• ∼ 10. 8. M ⊙.

Quasars and galaxy formation

mnras.oxfordjournals.org/content/324/1/128.full

Jun 1, 2001 ... We simulate hierarchical galaxy formation through the extended ... galaxies is consistent with the colour–magnitude relation and its redshift evolution. ... to mergers can cause gas in the interacting galaxies to fall rapidly to the centre .... the total effective energy output from supernovae by the specific kinetic ...

More Info

The Central Engine of an Active Galaxy

www.castlerock.wednet.edu

As a class, active galaxies (and quasars too, as we will see) have some or all of the ... Figure 16.11 Active Galactic Nucleus The leading theory for the energy ... an object having a luminosity of 10<sup>38</sup> W. In and of itself, this energy output is .... observations of M87 support the idea of a rapidly whirling accretion disk at its heart...

astronomy Flashcards | Quizlet

quizlet.com

Quasars appear to be. very distant, intrinsically ... the central nuclei of very distant , very active galaxies. .... A short period of extremely rapid expansion when the universe was very young. .... the Moon's distance from Earth varies from eclipse to eclipse. .... its total energy output emitted into space.

Supermassive Black Holes

arxiv.org

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...