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Observational Astronomy

by: Thomas Konopelski

Observational Astronomy AST 912

Marketplace > Michigan State University > Astronomy > AST 912 > Observational Astronomy
Thomas Konopelski
GPA 3.83


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Class Notes
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This 3 page Class Notes was uploaded by Thomas Konopelski on Saturday September 19, 2015. The Class Notes belongs to AST 912 at Michigan State University taught by Staff in Fall. Since its upload, it has received 45 views. For similar materials see /class/207491/ast-912-michigan-state-university in Astronomy at Michigan State University.


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Date Created: 09/19/15
Lecture 15 Outline 39 Stuff Blazars and other stuff Blazars 39 Observing 39 Course Evaluations April 22 2003 Other Stuff 800 PM BPS 1420 Quiz time Aurora Aurora also called Northern Lights Caused by the collision of solar Flnal lull particles with gas in the Earth s upper atmosphere Particles are thrown off of the NO bOOks39 Sun during large solar ares or NO notes eruptions These charged NO cheating particles are caught in the Earth s magnetic eld and they fall into our atmosphere Images on this an following pages taken from Ian Curtis39 web site httpclim ate gi alaska eduCuItiscurtis html Although easier to see at higher latitudes we do see them in East Lansing Here are some photos that Dr Smith has taken Aurora Web Pages 39 httpwww spacewcom 39 http www dcs lancsac ukionoaurorawatch 39 httpuvisunmsfcnasagovUVIcurrentimagehtml 39 httpwwwnorthernlightsno Blazars 39 Part of the unified AGN model Look like point sources some have nebulae Smooth and at spectra no strong absorption like stars would have Visible light is usually at least partially polarized Output at all wavelengths varies more rapidly than a quotclassicalquot quasar 510 of quasars are blazars Signi cant portion of emission is above 100 MeV Should explain this 5 minimsecauds Superluminal Motion Lobe jets can appear to have quotsuperluminalquot motion This means that if you assume that the jets are moving in the plane of the sky the lobes seem to move faster than the speed of light distance to object from redshift data size of lobe measured on the sky sometimes by as much as 10 c Relativity tells us that this is bad So what is going on Superluminal Motion gt If the jets are not actually in the plane of the sky but instead are pointed towards us we have to account for the difference in the position of the lobes at the time ofthe emission A photon is emitted at point t1 The cloud is still moving at a significant fraction of the speed of light 5 minimsecauds


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