Galaxy History

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Information about Galaxy History
Science-Technology

Published on October 14, 2008

Author: aSGuest920

Source: authorstream.com

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?

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