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The Milky Way Galaxy

The Milky Way Galaxy. What We See. What is a Galaxy?. A galaxy is a gravitationally bound collection of a large number of stars. The galaxy we inhibit is the Milky Way Galaxy, or the Galaxy.

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The Milky Way Galaxy

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  1. The Milky Way Galaxy

  2. What We See

  3. What is a Galaxy? • A galaxy is a gravitationally bound collection of a large number of stars. • The galaxy we inhibit is the Milky Way Galaxy, or the Galaxy. • The three basic parts to a galaxy are stars, dust and gas, which lie within the disk, bulge and halo.

  4. Components Disk – contains spiral arms; most of the light comes from this component Halo (spheroid) – spherical (or squashed spheroid) of old stars thought to contain most of the mass of the Galaxy Thick Disk – intermediate component between the disk and halo Bulge – central part of the Galaxy with an old population of high metallicity stars Nucleus – point source in the center of the Galaxy which contains a black hole

  5. Thickness: 978 Light Years Sun Diameter: Galactic Halo

  6. Galactic Arms • There are 4 major galactic arms in the Milky Way Galaxy, and several shorter segments, including: Sagittarius, Perseus, Cygnus, and Centaurus, and Orion arm, containing our solar system. • Our Milky Way Galaxy rotates clockwise.

  7. Galaxy Classification • Spiral, Barred Spiral, Elliptical, Irregular • Edwin Hubble- Appearance

  8. Galaxy Formation • Gravity attracts stars together. • Stopped- Well Defined time or Still going on. • Merger- when 2 combine into one • Cannibalism- when a large galaxy eats smaller ones

  9. Sub-categories of Barred Spirals

  10. Barred-Spiral Galaxy • Differ from Spirals in that there is an elongated bar going through. • SBa, SBb, SBc • Milky Way= Regular Spiral

  11. M5

  12. Clusters • Galaxy- A group held together by gravity. • Super- larger “cluster of clusters”

  13. Perseus Arm This picture displays what is between stars in the Perseus Spiral Arm of our Milky Way Galaxy by assigning different colors to radiation not detected by the human eye. Sagittarius Arm Object Con Type RA (2000) Dec dist M 20 NGC 6514 Sgr DN 18:02.6 -23:02 5.2 M 8 NGC 6523 Sgr DN 18:03.8 -24:23 5.2 M 21 NGC 6531 Sgr OC 18:04.6 -22:30 4.25 M 24 IC 4715? Sgr MWP 18:16.9 -18:29 10-15 NGC 6603 Sgr OC 18:18.4 -18:25 10 M 16 NGC 6611 Ser C/N 18:18.8 -13:47 7 M 18 NGC 6613 Sgr OC 18:19.9 -17:08 4.9 M 17 NGC 6618 Sgr DN 18:20.8 -16:11 5 M 26 NGC 6694 Sct OC 18:45.2 -09:24 5 M 11 * NGC 6705 Sct OC 18:51.1 -06:16 6

  14. Orion Arm • Our own Sun lies on the "Orion Arm", named after one of its prominent features, the Orion Nebula, about 1,600 light-years from the Sun. Other prominent sights in the Orion Arm include: • The Hyades star cluster, about 150 light-years away. • The giant star Canopus, about 310 light-years away and 100,000 times brighter than the Sun; the red giants Betelgeuse and Antares, 400 and 500 light-years away respectively; and the giant star Rigel, about 800 light-years away. • The Coalsack, a dark molecular cloud about 550 light-years away. It is about 60 light-years across and has a mass of about 40,000 Suns. • The Helix Nebula, a planetary nebula about 450 light-years away and the closest planetary nebula to the Sun, as well as the Dumbbell Nebula, a planetary nebula about 1,000 light-years away. • The Vela Nebula, a supernova remnant about 1,500 light-years away that is about 12,000 years old and contains a pulsar. • The Orion and Horsehead Nebulas, both about 1,600 light-years away; and the Cone Nebula, about 2,400 light-years away, all three being molecular clouds.

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