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1
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- Today: Finish Chapter
13, Galaxies
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“Town Meeting”
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2
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3
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4
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5
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6
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7
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8
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- Galaxies live in clusters
- Rich clusters: thousands of
galaxies
- Poor clusters: Fewer than a
thousand
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9
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10
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- Galaxies live in clusters
- Rich clusters: thousands of
galaxies
- Poor clusters: Few than a
thousand
- Fundamental difference between stars and galaxies:
- Stars live isolated lives:
- They are much smaller than distance between them
- They virtually never collide
- Galaxies are not isolated
- They are only slightly smaller than the distances between them
- The can (and do) collide, and interact with gas within clusters
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11
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- Stars pass “through” each other, but orbits around galaxy
disrupted
- Gas clouds collide
- Gas stripped away from stars
- Collisions cause bursts of star formation
- Ellipticals may be those galaxies which have suffered collisions
- Spirals may be those galaxies which have not suffered collisions
- Joshua Barnes (Hawaii) and the Space Telescope Science Institude provide
a simulation of the Antenna Galaxies: http://imgsrc.stsci.edu/op/pubinfo/pr/1997/34/images/anima.mov
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12
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13
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14
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- From the Space Telescope Science Institute which also provided the
Cartwheel image in the textbook:
- http://imgsrc.hubblesite.org/hu/discoveries/striking_encounters/graphics/cartwheel.mpg
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15
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16
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17
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- Movie simulation of galaxy formation via assembly of small pieces
(courtesy of Space Telescope Science Institute): http://imgsrc.stsci.edu/op/pubinfo/mpeg/galaxies.mpg
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18
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- Family of Galaxies
- Properties of Galaxies
- Distance; The Hubble Law
- Size and Luminosity
- Mass (including Dark Matter)
- Evolution of Galaxies
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Notes