PX269 Galaxies Dr Peter Wheatley

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Presentation transcript:

PX269 Galaxies Dr Peter Wheatley 7.5 CATs; ~18 lectures; follows from PX268 Stars Dr Peter Wheatley p.j.wheatley@warwick.ac.uk Office: PS009

Books

Books II

Books III

Part 1: Introduction 1.1 Historical overview

The Milky Way Wei-Hao Wang University of Hawaii Lecture 1, historical context, how do we know what galaxies are? The Milky Way Wei-Hao Wang University of Hawaii

Galileo Galilei 1609

Mountains and craters on the moon

Sunspots

Galileo’s sketch Cassini probe Saturn’s rings

Jupiter’s moons Europa Io Ganymede Callisto Kurt Friedrich

The Starry Messenger, Galileo Galilei 1610 SIDEREAL MESSENGER unfolding great and very wonderful sights and displaying to the gaze of everyone, but especially philosophers and astronomers, the things that were observed by GALILEO GALILEI, Florentine patrician and 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 about four planets flying around the star of Jupiter at unequal intervals and periods with wonderful swiftness; which, unknown by anyone until this day, the first author detected recently and decided to name MEDICEAN STARS The Starry Messenger, Galileo Galilei 1610

Milky Way Wei-Hao Wang University of Hawaii

Milky Way and a “spiral nebula” Wei-Hao Wang University of Hawaii Milky Way and a “spiral nebula”

1750s Thomas Wright Immanuel Kant

Angular momentum and disc geometries Believe Sun and planets formed from a Solar Nebula, rotation + collapse => disk. Rich Townsend, UCL

Wei-Hao Wang University of Hawaii

Charles Messier

Andromeda Galaxy = M31 = NGC 224

Cepheid variables as standard candles Magnitude Log Period [d] Henrietta Swan Leavitt

100-inch Mt Wilson telescope Edwin Hubble

Hubble Space Telescope

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.

Part 1: Introduction 1.2 Galaxy classification

Hubble Space Telescope Lecture 2, classification of galaxies

M87 an elliptical galaxy CFHT

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 Lecture 3, the Milky Way