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lecture15 - Galaxy Collisions very important process...

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Antennae galaxies -- NGC 4038, 4039 Galaxy Collisions – very important process visible light infrared starbursts triggered where gas collides
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Collision of 2 Galaxies : 1) prob. of stellar collisions is nil. 2) interstellar gas Flls much more of the volume, ==> gas in the two galaxies will collide Another important component ?
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Dark matter : measure motions of stars and gas w/i galaxies => dominates mass in outer radii of galaxies and clusters dark matter halo around galaxy visible matter galaxy
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Numerical simulations model galaxy interactions and merging use newton’s law to model star motions hydrodynamics to model gas equal mass merger stars gas gas is disipative ==> sinks to center more rapidly merging takes ~500 million yrs
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The Mice Viewing angle Labelled Stars Stars
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Mice – played to future Visible image
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shock induced star formation
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star formation perscriptions : SF ~ density 1.5 shock induced SF
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Cartwheel Galaxy – ring galaxy how was this formed ??
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Cartwheel Galaxy -- satellite galaxy passes through on polar axis xray (contours) ==> culprit Which one is it ?
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This note was uploaded on 09/25/2010 for the course AY 106 taught by Professor Schrerr during the Winter '09 term at UMBC.

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lecture15 - Galaxy Collisions very important process...

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