Chapter 15.The Milky Way Galaxy

Chapter 15.The Milky Way Galaxy - The Milky Way Galaxy...

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1 The Milky Way Galaxy Chapter 15
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2 Looking into the plane of our galaxy, toward the center. Note – obscuring effects of dust
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3 Panoramic View of Milky Way
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6 William Herschel’s sketch of the Milky Way – 1784 Because of IS dust, he thought the Sun was at the center.
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7 Globular Cluster M80, one of over 130 around the Milky Way.
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8 By plotting the positions of globulars, Harlow Shapley found the Sun was 25-30 thousand LYs from the Galactic Center. This scale is incorrect. Shapley used RR Lyrae stars to determine their distances.
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10 M83, a smaller spiral than the Milky Way
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11 1 kpc = 3,260 light years
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12 There are nearly 400 billion stars in the Milky Way. All the stars you can see in the sky with your eye are in our Galaxy. The Milky Way is made of gas, dust and stars . Most of the gas, dust and stars are located in the disk.
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13 Stellar Populations AGE Pop I Pop II Young to Old(10 6 – 10 9 yrs) Old (about 10 9 YRS) Color Blue Red Location Disk Halo and bulge Orbit Approx. circular Elongated Heavy-Elements High (like Sun) Low (<1% Sun’s)
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16 Star Clusters Open clusters : 10 1 -10 3+ stars, R : 7-20 ly; found along arms, disk Globular Clusters : 10 5 -10 6 stars; R = 40-160 ly; halo and bulge Associations : 5-70 O or B stars; R = 65-325 ly; spiral arms Stars clusters are important because they give us insight into the evolution of stars.
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18 M104 Notice how the dust in confined to the plane of a spiral galaxy.
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19 IS Dust scatters light and produces “interstellar reddening.”
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This note was uploaded on 04/17/2008 for the course ASTRO 1504 taught by Professor Tabak during the Spring '08 term at Youngstown State University.

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Chapter 15.The Milky Way Galaxy - The Milky Way Galaxy...

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