PX269 Galaxies

PX269 Galaxies

Dr Peter Wheatley

p.j.wheatley@warwick.ac.uk Office: PS009

PX269 Galaxies

Books£25£45

PX269 Galaxies

Books II £30 £35

PX269 Galaxies

Part 1: Introduction

1.1 Historical overview

PX269 GalaxiesWei-Hao WangUniversity of Hawaii

The Milky Way

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Galileo Galilei

1609

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Mountains and craters on the moon

Sunspots

                          

Cassini probe

Galileo’s sketch

Saturn’s rings

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Europa   Io      Ganymede   Callisto

Kurt Friedrich

Jupiter’s moons

SIDEREAL MESSENGERunfolding great and very wonderful sightsand displaying to the gaze of everyone,but especially philosophers and astronomers,the things that were observed byGALILEO GALILEI,Florentine patricianand public mathematician of the University of Padua,with the help of a spyglass lately devised by him,about the face of the Moon, countless fixed stars,the Milky Way, nebulous stars,but especially aboutfour planetsflying around the star of Jupiter at unequal intervalsand periods with wonderful swiftness;which, unknown by anyone until this day,the first author detected recentlyand decided to nameMEDICEAN STARS

The Starry Messenger, Galileo Galilei 1610

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Milky Way

Wei-Hao WangUniversity of Hawaii

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Wei-Hao WangUniversity of Hawaii

Milky Way and a “spiral nebula”

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1750s

Thomas Wright

Immanuel Kant

Rich Townsend, UCL

Angular momentum and disc geometries

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Wei-Hao WangUniversity of Hawaii

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Charles Messier

Andromeda Galaxy = M31 = NGC 224

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Andromeda Galaxy = M31 = NGC 224Lord Rosse 72” telescope

1845

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Cepheid variables as standard candles

Henrietta Swan Leavitt

Log Period [d]

Magnitude

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Edwin Hubble

100-inch Mt Wilson telescope

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Hubble Space Telescope

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M 51 the Whirlpool Galaxy

PX269 GalaxiesWei-Hao WangUniversity of Hawaii

The Milky Way

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Hubble Deep Field

1,000,000 sec exposure

Seeing 100 billion times fainter than human eye…

…and half way back to the beginning of time.

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Part 1: Introduction

1.2 Galaxy classification

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Edwin Hubble

100-inch Mt Wilson telescope

Hubble Space Telescope

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M87

an elliptical galaxy

CFHT

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NGC 2768

an elliptical galaxy

M 51 the Whirlpool Galaxy

NGC 1300 a barred spiral galaxy

Dust extinction in the Sombrero Galaxy = M 104

NGC 1427A

a dwarf irregular galaxy

M 51 the Whirlpool Galaxy

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Hertzsprung-Russell(HR) Diagram