1 / 12

Classifying Galaxies

Classifying Galaxies. By: Mary Lange. Edwin Hubble. November 20, 1889 – September 28, 1953 An American astronomer Confirmed other galaxies existed The first to categorize galaxies. Hubble’s Galaxy Classification.

ordell
Download Presentation

Classifying Galaxies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Classifying Galaxies By: Mary Lange

  2. Edwin Hubble • November 20, 1889 – September 28, 1953 • An American astronomer • Confirmed other galaxies existed • The first to categorize galaxies

  3. Hubble’s Galaxy Classification The 3 Major Galaxy Classifications • Spirals • Elliptical • Irregulars

  4. Spiral Galaxies • Flattened galactic disk • Spiral arms • Central galactic bulge • Dense nucleus • Extended halo • Faint, Old stars • Newer Stars • Example: • Milky Way Galaxy • Andromeda

  5. Elliptical Galaxies • No galactic disk • No spiral arms • Little or no bulge • Dense central nucleus • No halo • Less evidence for young stars

  6. Irregular galaxies • Do not fit into any other category! • Rich in interstellar matter • Young Blue Stars • Lack Regular Structure

  7. The Tuning Fork of Hubble Sequence This image shows how similar in appearance the galaxies appear to be. • E0- E7 are elliptical galaxies • SO are between the elliptical and spiral • S and SB are spiral galaxies • Sa – Sc are spiral galaxies • SBa – SBc are barred-spiral

  8. Bright Galaxies • Seyfert Galaxy • Discovered by Carl Seyfert in 1943. • Resemble the “Normal Galaxy” • All Energy is emitted from the galactic nucleus. • 10,000 times brighter than our galaxy.

  9. Bright Galaxies • Radio Galaxy • Radio galaxies are in the elliptical family. • Emits energy from it’s lobes. • Differs from the Seyfert Galaxies • The wavelengths at which they radiate • Appearance • Emitting regions (Radio portion of the electromagnetic spectrum)

  10. Bright Galaxy • Quasar Galaxy • Date back to much earlier periods of galaxy formation and evolution than other galaxies. • Share many properties of Seyferts and Radio Galaxies • Most energy is emitted in infrared spectrum • Jets and extended emissions

  11. References • Ewert, Michael. Astronomy 162. N.p.: University ofTennesse, n.d. N. pag. Web. 6 Dec. 2011. <http://csep10.phys.utk.edu/astr162/lect/index.html>. • McMillan, Steve, and Eric Chaisson. Astronomy: A beginner's guide to the universe. sixth ed. San Francisco: Addison-Wesley, 2010. 404-29. Print. • Ventrudo, Brian. One Minute Astronomer. N.p.: Brian Ventrudo, Ph.D., 2011. Web. 6 Dec. 2011. <http://www.oneminuteastronomer.com>.

More Related