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by: Ashlee Heaney


Ashlee Heaney
GPA 3.78


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Class Notes
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This 1 page Class Notes was uploaded by Ashlee Heaney on Wednesday September 30, 2015. The Class Notes belongs to ASTR 414 at Western Kentucky University taught by Staff in Fall. Since its upload, it has received 29 views. For similar materials see /class/216700/astr-414-western-kentucky-university in Astronomy at Western Kentucky University.




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Date Created: 09/30/15
Lecture 1 Basic Structure of the Milky Way Galactic astronomy is recent field of study extragalactic astrophysics is even more recent early 180039s evidence stars were distant Suns few times 105 AU to nearby stars 1832 Bessel measured 032 arcseconds of parallax for 61 Cyg 1839 Henderson measured 1 arcsecond parallax for Alpha Centauri 1840 l39 39 39 026 39 parallax to Vega early 190039s evidence quotspiral nebulaequot are distant galaxies quotisland universesquot Milky Way Galaxy system of stars gasampdust and dark matter bound by mutual gravitational attraction Galactos greek root for milk Before telescope unable to resolve Milky Way into separate stars Multiwavelength Milky Way lhttpadcgsfcnasagovmwl NASA Lambda 3Dmodels httn39 lambda Ier nasa productcobevrml quot10 1qu me Disk stars gas amp dust distributed in disk Herschel 1785 relative distance from center of Galaxy Shapley 1917 Galactic coordinates latitude b and longitude l spiral structure multiple phases of gas ionized neutral and molecular 20 luminousobservable mass is gas barred spiral with warped disk see DIRBECOBE images Freudenreich diameter of gaseous disk greater than stellar disk scale height of disks thin blue stars and cold gas vs thicker red stars and warm gas mass interior to Sun s orbit Halo dominated by dark matter Galaxy s total mass N10x greater than of stars gasampdust stars traced by globular clusters out to 01Mly or even 03 Mly LMC N 018 Mly slightly oblate vs prolate ba N 08 spheroid for halo traceable by stars Luminosity of halo N 2 x109 Lsun Luminous mass of halo N 25 x109 Msun Total mass of halo gt N 250 x109 Msun Bulge N10 x109 Msun bar points Within 13 degrees of Sun s location possible that almost all of bulge is associated with bar just outside bar r N 5kpc is ring of dense molecular gas probably result of resonance with bar Nucleus mostly obscured by large column density of gasampdust exceptions include Baade s window multiple phases of gas ionized neutral and molecular


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