Transcript Galaxies

Galaxies
The Great Debate
Harlow Shapley
Heber Curtis
April 26, 1920
Edwin Hubble
Hubble Tuning
Fork Diagram
The Local Group
Ellipticals
M32 - E2
NGC 4125
M87 - E1
Sa Galaxies
M96
M104
Sb Galaxy
M81
Sc Galaxies
M51
Sba Galaxies
NGC 1097
NGC 4477
SBb Galaxies
M91
NGC 4579
SBc Galaxies
M109
NGC 4123
Irregular Galaxy
Large Magellenic Cloud
Peculiar Galaxies
Centaurus A
M87
Seyfert Galaxies
 Often normal looking galaxies
 Very bright nuclei (AGN's)
 Typically 10,000X brighter than core of
Milky Way
 Radio observations suggest that the
nucleus is typically less than a light year
across.
 All indicators point to violent explosive
activity in the galactic nucleus.
 Total luminosity 10X Milky Way
Double Lobed
Radio Galaxies
 Similar to Seyferts
 Most energy emitted in radio
 Distinct lobes extending many
kpc from the galactic core.
 Energetic, small nucleus.
Clusters of Galaxies
NGC 3628 - Sc
M65 - Sa
M66 - Sb
Galactic Collisions
Large Scale Structure