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The Milky Way Galaxy
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Pollution proceeds fastest near Galactic centre

Older stars have fewer heavy elements

Radial migration leads to big spread in [Fe/H] at given age

Slide 14

Velocity space from Hipparcos

Velocity space from Hipparcos

Distribution of stars lumpy in velocity space

Pointer to the Galactic bar and spiral structure

Slide 15

Stars trapped by the bar

Stars trapped by the bar

Slide 16

Interstellar Gas

Interstellar Gas

Systematic effect: circular streaming

Slide 17

CO

CO

HI

Slide 18

The Galactic Bar

The Galactic Bar

Gas towards the GC moving away at ~150km/s

Slide 19

Expected if Galaxy barred

Expected if Galaxy barred

to Sun

Slide 20

If we could look down

If we could look down

Slide 21

Near IR Photometry

Near IR Photometry

Galaxy brighter on left of GC

Slide 22

Individual objects (eg HB stars) also brighter on left

Individual objects (eg HB stars) also brighter on left

Slide 23

The Galactic Centre

The Galactic Centre

Slide 24

Sgr A and Filaments

Sgr A and Filaments

Slide 25

Inclined Nuclear Disk

Inclined Nuclear Disk

Slide 26

The Black Hole

The Black Hole

Weak radio source Sgr A* marks spot

Orbiting stars reveal its force-field

Slide 27

Globular Clusters

Globular Clusters

M3

100 000 stars

Slide 28

Halo & Disk Clusters

Halo & Disk Clusters

Disk

Halo

Slide 29

Disk clusters more metal-rich

Disk clusters more metal-rich

Also a population of field stars traced by blue horizontal branch stars & RR Lyrae stars

many from destroyed globular clusters

Slide 30

Stellar halo (SDSS)

Stellar halo (SDSS)

residuals

Bell et al

(2007)

Slide 31

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