Details Title: CHAPTER 17 Description: from book and outline paper Total Flash Cards: 21 Created: 05/05/2009 16:57:06		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Astronomy Flashcards
Cards in this set: Term what is a galaxy with extremely violent energy release in its nucleus called? Definition active Term What does AGN stand for? Definition Active Galactic Nuclei Term what is most of the light from a normal spiral galaxy? what kind of spectra does it contain? Definition starlight; and absorption line spectra Term what type of spiral galaxy has an extremely bright core with emission spectra? Definition Seyfert Term What is Seyfret's likely power source? Definition accretion onto a supermassive black hole Term what are active galaxies often associated with? Definition interacting galaxies Term True or false: Material in the jets above moves at relativistic speed. Definition true Term What are radio jets powered by? Definition accretion of matter onto supermassive black hole Term how does the material stay in the radio jet? Definition twisted magnetic fields confine material to jet and produce sychrotron radiation Term what are Seyfert I galaxies brightest in? Seyfert II galaxies? Definition UV and Xray for I; IR for II Term What do radio galaxies have? Definition powerful radio lobes at end points of jets where power is dissipated Term what are objects with properties very similiar to quasars but no emission lines? Definition BL Lac objects Term A radio galaxy is an AGN with a radio jet point toward or perpendicular to us? Definition perpendicular Term A quaser is an AGN with a radio jet point towards or perpendicular to uS? Definition towards Term In normal galaxies, xray sources are usually what? Definition accreting stellar mass black holes Term A star thats wandering too close to a supermassive black hole can trigger what? Definition Xray bursts Term Quasars show strong variablilty over time scales of how long? Definition a few months Term Spectral lines of quasars show what kind of shift? Definition red Term Spectral lines of quasars are (very far from/moderately far from/near to)the milky way Definition very far from Term What were active galaxies known as before? Definition radio galaxies Term what is a blazar? Definition a BL Lac object