galaxy history – how we got here. stars evolve, therefore so do galaxies we parts of a rich...
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Galaxy History – how we got here• Stars evolve, therefore so do galaxies• We parts of a rich history – they grow, starburst,
acquire gas, lose gas, change chemistry, shut down starbirth, interact with central black holes
• Contemporary hints – the galactic fossil record• Cosmic time machine – we can see their past!• We must be wide-ranging in space and energy• Tools: Hubble, Chandra, Spitzer, GALEX,
ground-based telescopes – and brains
…so galaxies do too. Some clues are foundin the contemporary fossil record.
Elliptical galaxy: only old stars, no cold gas to make more
…so galaxies do too. Some clues are foundin the contemporary fossil record.
Elliptical galaxy: only old stars, no cold gas to make more
Spiral galaxy: allages present, stars still formed in gas-rich disk
Across the spectrum - now
FarIR MidIR nearIR opt UV farUV X-ray gamma
Spitzer
Hubble Chandra
GALEX
FUSE
INTEGRAL
WMAP
Akari
A sky survey for the new millennium
• Potentially 4000+ objects per exposure
• Uniquely wide field for 6.5-meter telescope
• Uniquely wide slice of spectrum at once
• Add time dimension to Sloan survey galaxies
• Study internal galaxy structure
• UA involvement in project planning – at the table pending fundraising!
Even very distant galaxies can often be mapped from the ground
Kitt Peak/Hubble, optical NASA IR telescope, IR
Galaxy history
• Downsizing (I love the crash of a theory…)
• Central black holes are ubiquitous and may regulate surrounding starbirth
• Large galaxies grow at the expense of dwarfs
• Galaxies have long interacted with their surroundings – gas, other galaxies…
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