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(1)
(2)

Outline for today

(3)

The Anatomy of Galaxies

Dark Matter Stars

Gas Dust Supermassive black hole

(4)

Historical Background: The Milky Way

(5)

Historical Background: The Milky Way

(6)

Historical Background: The Milky Way

(7)

Historical Background: Other Galaxies

(8)

Historical Background: Active Galaxies

(9)

Historical Background: Quasars/QSO

(10)

Intermission: What is this?

(11)

Galaxy Classification

The Hubble Tuning Fork

Irregular Galaxies

Dwarf Galaxies Elliptical

Galaxies

Lenticular Galaxies

(12)

Galaxy Classification

Examples:

a=1 a=1 a=1

b=0.3 b=0.7

b=1

E0 E3 E7

(13)

Galaxy Classification

Examples:

S0 Edge-on Face-on

(14)

Galaxy Classification

Normal Spirals

Barred Spirals

• Large bulges

• Tightly wound spiral arms

• Few star-forming regions in arms

• Small bulges

• Loosely wound spiral arms

• Many star-forming regions in arms

Sa Sb Sc

SBb

SBa SBc

(15)

Galaxy Classification

Irregular galaxies (I)

(16)

Galaxy Classification

Dwarf galaxies (dE, dSph, dI…) – Low-luminosity objects

(17)

Morphological Type?

(18)

Morphological Type?

(19)

What is the Point of Morphological Classification?

(20)

Morphological Complications

X-rays UV Optical

Near-IR Far-IR

Same galaxy (M81) at different

wavelengths!

(21)

Morphological Complications

(22)

Morphological Complications

Wavelength Flux

Zero redshift

Wavelength Flux

Filter profile

High redshift

(23)

The Cosmological Framework I

(24)

The Cosmological Framework II

(25)

The Cosmological Framework III

(26)

The Cosmological Framework IV

References

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