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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...

astronomy Flashcards | Quizlet


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.

Chapter 25


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 ...

Active galactic nuclei - NCBI - National Institutes of Health


Active galactic nuclei (AGN) involve the most powerful, steady sources of luminosity in the Universe. ... The power output of AGN is often variable on time scales of years and ... Causality implies that an object that varies rapidly in time t must be smaller ... The gravitational energy liberated during accretion onto a black hole is ...

George DARWIN Lecture 1976 - Quasars and young galaxies


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 energy) ...

SuppQsFinalExamAstro320Spring08 - Scribd


B) cause both galaxies to collapse into a supermassive black hole. ... 16) What is implied about an active galaxy or quasar that varies its energy output rapidly?

Introduction to active galaxies: View as single page


Active galaxies provide a prime example of high-energy processes operating in the ... of starburst galaxies and the four main classes of active galaxies (quasars, ... 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.

The impact of angular momentum on black hole accretion rates in ...


Sep 14, 2015 ... 1011.5M⊙, rapid BH growth leads to the suppression of star formation and reduced growth of ... Key words: black hole physics, galaxies: formation, galaxies: active, methods: hy- ... tional support, since the bulk of energy output from quasars .... the Bondi accretion rate or its extension, usually referred to.

An Energetic AGN Outburst Powered by a Rapidly Spinning ...


galaxy by accretion with a 10% mass-to-energy conversion efficiency implies that its putative supermassive black hole (SMBH) grew by ∼ 6 × 108 M⊙ over the ... Active Galactic Nuclei: individual (MS0735.6+7421). 1. .... We show that both the energy and power output from AGN determined using X-ray .... The implied.

Bright Quasar 3C€273 - Caltech Astronomy


Mar 2, 2006 ... ... its discovery in 1963. Quasars are found in the center of some galaxies ... Its light output corresponds to 1014 times that of the Sun. ... It was also soon discovered that 3C 273 varies in ... of energy can be released by matter in a very small volume, ... black hole that is implied by this reasoning is about one.

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Ask an Astrophysicist: Quasars & Active Galaxies


Nov 21, 2014 ... Quasars & Active Galaxies ... Was the Milky Way galaxy once a Quasar? .... Is the redshift of a Quasar a good indicator of its distance? .... 4) Their output in all wavelength bands varies more rapidly and by a larger amount than a quasar. ... A service of the High Energy Astrophysics Science Archive Research ....

Active Galaxies and Quasars - Introduction - Imagine the Universe!


Nov 17, 2014 ... The energy emitted by an active galaxy (or AGN) is anything but "normal". So what is happening in these galaxies to produce such an energetic output? ... an AGN which has one of its relativistic jets pointed toward the Earth ...

Galactic Monsters - StarDate's Black Hole Encyclopedia


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 ...