Presentation Transcript
Galaxy History – how we got here :Galaxy History – how we got here
Galaxy History – how we got here :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
Slide 3:Stars have life cycles…
Slide 4:…so galaxies do too. Some clues are found
in the contemporary fossil record.
Slide 5:…so galaxies do too. Some clues are found
in the contemporary fossil record. Elliptical galaxy: only old stars, no cold gas to make more
Slide 6:…so galaxies do too. Some clues are found
in the contemporary fossil record. Elliptical galaxy: only old stars, no cold gas to make more Spiral galaxy: all
ages present, stars still formed in gas-rich disk
Waiting for the light – the Universe is a one-way time machine :Waiting for the light – the Universe is a one-way time machine 2.6 seconds
round trip
Slide 8:8 minutes 75 minutes
Slide 9:4.3 years 15,000 years
Slide 10:60 million years 2 billion years
Slide 11:Galaxy collisions, mergers, and starbursts
Slide 13:Abell 2125-C153
A galaxy loses its gas
Slide 16:Across the spectrum - now
FarIR MidIR nearIR opt UV farUV X-ray gamma Spitzer Hubble Chandra GALEX FUSE INTEGRAL WMAP Akari
A panchromatic view -spiral galaxy M81 :A panchromatic view -spiral galaxy M81 ROSAT
GALEX
Kitt Peak
Spitzer
VLA
Slide 19:San Pedro Martir
115° 27´49 W 31° 02´39 N 2,830 m + + + + + +
A sky survey for the new millennium :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 :Even very distant galaxies can often be mapped from the ground Kitt Peak/Hubble, optical NASA IR telescope, IR
Slide 23:N=270
Galaxy history :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…
Looking forward to looking back :Looking forward to looking back Chemistry of young galaxies
How did these enormous black holes grow?
What were the first stars like?
Why do some galaxies shut down star formation, and others host massive rapid bursts?