Astronomy 100

What’s in a Galaxy

• Now: Go to http://beta.galaxyzoo.org/Index.aspx Register.

• Goal:– Understand the different types of Galaxies– Know the features of galaxies– Catch the little details about galaxies we haven’t

covered yet.– Coordinate meeting at PSC next Wednesday

• Vocabulary: Rotation curve, Megaparsec, Hubble law, Gravitational lensing, Clusters of galaxies, Interacting galaxies, Active galactic nuclei, quasars, Seyfert Galaxies, Supermassive Black Holes, Jets – again!

Types of Galaxies

• What types of galaxies did you notice?

• What features did you notice in the galaxies?

Star Clusters

• Globulars – in the halo – oldsters• Open – in the disk – younger

Hubble Tuning Fork

http://www.le.ac.uk/ph/faulkes/web/images/tuning_fork_diagram.jpg

http://apod.nasa.gov/apod/ap080606.html

HUDF

Rotation Curve

• http://pppa.group.shef.ac.uk/dm/images/rotationCurve.jpg

• Great DM Lecture: • http://bustard.phys.nd.edu/Phys171/

lectures/dm.html

Hubble’s Law

• Remember red shift?• Everything is redshifted - more if it’s further

away• The Universe is Expanding.

Gravitational Lensing

• http://www.windows.ucar.edu/the_universe/images/ab2218_sm.jpg

Large Structure

• http://urania.bo.astro.it/slice_bigcluster2.jpg

The Mice

• http://www.ifa.hawaii.edu/~barnes/research/interaction_models/mice/index.html#highres

• http://antwrp.gsfc.nasa.gov/apod/ap040612.html

Active Galactic Nuclei

• Seyfert Galaxies (active core)• Quasars (really far away, really bright)• Radio Galaxies• Starburst Galaxies (bright arms/disk)

• Powered by supermassive black holes?• Jets – again!

• Answer Now (draw or describe):• Tell me about the different types of galaxies

or• Tell me about the common features of

galaxies• Define 1: Rotation curve, Megaparsec, Hubble law,

Gravitational lensing, Clusters of galaxies, Interacting galaxies, Active galactic nuclei, quasars, Seyfert Galaxies, Supermassive Black Holes, Jets

• Before You Leave: How are you getting to PSC next Wednesday?