Nearby Galaxy Evolution Prof. Gerhardt R Meurer. Galaxy evolution in a nutshell Galaxy Evolution2  Time machines  The farther we peer  The farther.

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Presentation transcript:

Nearby Galaxy Evolution Prof. Gerhardt R Meurer

Galaxy evolution in a nutshell Galaxy Evolution2  Time machines  The farther we peer  The farther back in time we see  Reveal cosmic history  Hubble: to < 1 Gyr after big bang  WMAP, Planck: to < 1 Myr  The nearby universe  See recent evolution  See galaxies in exquisite detail  Can detect the faintest galaxies  Galaxies stabilizing

Transformation Galaxy Evolution3  The Star Formation Cycle  Interstellar gas clouds cool and collapse  Stars form (also planets...)  Stars expel gas o stellar winds o supernovae explosions  Some of the material returns to a gas phase o hotter o brighter o enriched hot gas heavy elements energy radiation hot gas heavy elements energy radiation

We can see this happen Galaxy Evolution4  Examples  NGC3603: young star cluster  NGC1705: exploding galaxy  Many telescopes needed  cool gas: radio  young stars: optical, UV  Explosions, hot gas: optical, X- ray

Surveying star formation Galaxy Evolution5  An international effort  Parkes 64m: cool hydrogen  CTIO1.5m: hot hydrogen  GALEX: hottest stars (UV)  All types of gas-rich galaxies  Big spirals  little dwarfs  Interactions / mergers  Unexpected companions  Science  What types of stars form?  Where do stars form?  How is SF regulated?  What is total cosmic SF rate?

Other Facilities I Use (or will use) Galaxy Evolution6  Hubble Space Telescope  Pan-STARRS1 1.8m  SkyMapper 1.3m  Australian National University 2.3m  WIYN 3.5m  Australia Telescope Compact Array  Wide-field Infrared Survey Explorer (WISE)  Australia Square Kilometre Array Pathfinder (ASKAP)

7 My Collaborations with the USA Galaxy Evolution7  Johns Hopkins University (Baltimore, MD)  Space Telescope Science Institute (Baltimore, MD)  National Science Foundation (Washington DC)  Carnegie Observatories (Pasadena CA)  U. California, Santa Cruz  Arizona State University (Phoenix AZ)  University of Massachusetts (HST proposal)  University of Colorado (NASA Small Mission Explorer proposal)

8 Larger collaborations Galaxy Evolution8  Murchison Wide Field Array  Three US Partner institutions  MOU PanSTARRS1 & ICRAR  Analyze the light of thousands of galaxies  Large Synoptic Survey Telescope  See Wicenec presentation  Square Kilometre Array  Many interested scientist in the USA

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