Part 2: The Milky Way 2.1 Components and Structure

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Part 2: The Milky Way 2.1 Components and Structure PX269 Galaxies Part 2: The Milky Way 2.1 Components and Structure

The Milky Way Wei-Hao Wang University of Hawaii

First map of Milky Way: Sun near centre Herschel, 1785

Globular cluster 47 Tuc, 2MASS Distribution of globular clusters suggests Sun not close to centre

Extinction in plane of Milky Way Wei-Hao Wang University of Hawaii Extinction in plane of Milky Way

NGC 891, showing extinction Adam Block

NGC 6744, Milky Way-like galaxy Capella Observatory

NGC 6744 in HI Ryder et al 1999

M 51 the Whirlpool Galaxy HII regions

HII regions: the Orion Nebula Mike Fleenor

Lecture 4, The ISM NGC 6744, HI, Ryder et al 1999

21cm HI map of Milky Way

Molecular clouds

Dust scattering

Interstellar reddening Lecture 5 = dust extinction Interstellar reddening

Pleiades open cluster Scattered light Philip Perkins

NGC 891 Optical Infra-red CFHT 2MASS

Wei-Hao Wang University of Hawaii

COBE/DIRBE near infrared image of whole sky

Part 2: The Milky Way 2.2 Kinematics

Galactic co-ordinates Lecture 6 (or 7?) Carroll & Ostlie, 1996

Carroll & Ostlie, 1996

Carroll & Ostlie, 1996

Peculiar velocities of nearby stars Carroll & Ostlie, 1996

Carroll & Ostlie, 1996

HI map of whole sky

21 cm line profile along one line of sight Carroll & Ostlie, 1996

Carroll & Ostlie, 1996

Rotation curve of Milky Way

A = rotation curve for centrally-concentrated mass distribution B = rotation curve for extended mass distribution

First detection of a gravitational microlensing event Alcock et al 1993

Discovery of a 5 Earth mass planet Beaulieu et al 2006

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