Our Galaxy: The Milky Way
Our Galaxy: The Milky Way Astr 1010-100
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This 3 page Class Notes was uploaded by Alyssa Karounos on Friday March 6, 2015. The Class Notes belongs to Astr 1010-100 at University of Washington taught by Dr. Oliver Fraser in Winter2015. Since its upload, it has received 111 views. For similar materials see Introductory Astronomy 1 in Astronomy at University of Washington.
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Date Created: 03/06/15
3615 I II III IV VI Explain the evidence for dark matter Identify the structures that compose the Milky Way Link present day evidence to the formation story of the Milky Way Disks seem more blue 1 this comes from new stars disk galaxies have recent star formation unlike ellipticals which is a lot of light from red giants 1 not a lot of star formation Dark matter A P150 F the normal matter that we don t see directly but the effect of this gravity galaxies exist within huge clouds of dust measure dark matter by comparing visible mass to actual mass visible mass is due to stars gas and dust actual mass is measured using either motions or directly form curved spacetime the visible makes the invisible visible Bending Light from a Super Nova A B C D E Light has four different paths that it can take which all have different times space occurs because path lengths are different gravitational lensing makes what we normally wouldn39t see because of distance and dimness causes our views of its time to be slowed down three times special general relativity Measure Dark Matter using Motions A motions include orbits rotation curves even intergalactic gas temperatures B since motions are determined by gravity and gravity is determined by where the mass is if we can measure motions we can infer where the mass is Milky Way Mass A Rotation curves helped convince people to believe in Dark Matter B the magellanic cloud in the Milky way is very far away from visible disk but going really far C it must still be inbedded in mass D the mass of the milky way is spread out pretty evenly because of it s rotation curve B there s more mass than we see F Milky Way is quite thin G we can see outside our galaxy H I J VII A P150 7 0 VIII mmcww 53 wczgrwecmm Dust cloud blocking light very well 1 inferred you can see things in the dust Halo spherical shape surrounded the galaxy which houses globular clusters Structures of the Milky Way 1 disk 2 bludge 3 Halo Disk of the Milky Way hard to measure because we re inside it we have arms we can t see past the galactic center density waves naturally emerge in my circulating systems spread out the density wave and spread out the medium are not equal and may not even be in the same direction density waves provoke star formation in the disk creating many bright stars in the spiral arms bright stars have brief lives so the training of the density wave fads arms and stars don t move at the same speed fewer cluster in the halo and satellite galaXies faced and still in the halo disk object orbit together Halo objects orbit in many different directions stars normally travel in the same speed halo stuff must be made from many different gas blobs disk must be formed by one blog Diskrotation stellar halo bulge random orbits heavy elements in stars a new generation star Milky Way formation found that high velocity stars have fewer heavy elements since heavy elements are created in newer stars the high velocity stars are older combined with the knowledge that gas feels friction and sinks but stars can t high velocity stars are completely different and must be in the halo and we have fewer heavy elements and must be older galaxy formed from bigger cloud that collapsed with the few stars and star clusters older stars in the milky way are in the halo far globular clusters Formation l a blob of gas 9959 7 start to feel friction and stars hit each other collapsing into a disk cluster of stars stay on orbit they were formed in dust and gas starts to feel friction and make their own stars the rst stars older stars stay in the halo the new stars are found in the disk J sun is not a first generation star K dark matter does eXist in the univesrenand in our glaxy L large scales make a huge difference M minor mergers l 2 most common form of merger disrupts dwarf galaXies
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