Overview of the Milky Way Galaxy

Luminous (stellar) Mass:

Dynamical Mass (total)

Number of Stars:

Galaxy Type:

3x1010 Msun

2x1012 Msun

~1011 stars

Spiral (Sbc)

(<m> = 0.3 Msun)

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Milky Way (infrared image)

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Andromeda Galaxy (M-31)

M-32Satellite

Satellite galaxyNGC 205

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M-104 (spiral with prominent bulge)

Photo: Russell Croman

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NGC 2841(4-band HST image)

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NGC 4710(note box orbits in bulge)

Envelope of “box orbits” appears as X-shape

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NGC 5584(Hubble

Cepheid study)

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Another Spiral Galaxy

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Edge-on Spiral(NGC 4013)

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Barred Spiral (Hubble image)

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NGC 1365(largest barred spiral)

200,000 light yrs across (taken by ESA/La Silla

1.5m telescope)Friday, March 18, 2011

IC-10 (dwarf galaxy)

D ≈ 500-700 kpc

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Leo I Dwarf

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Sagittarius Dwarf

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