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Variables and Transients

Variables and Transients. The exciting parts of the universe. Sydney Institute for Astronomy ( SIfA )/ CAASTRO – The University of Sydney. Dr. Paul Hancock. (and occasionally the Sydney Observatory). Transients are Extreme. Transients include the Brightest Fastest Hottest Most massive

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Variables and Transients

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  1. Variables and Transients The exciting parts of the universe Sydney Institute for Astronomy (SIfA)/ CAASTRO – The University of Sydney Dr. Paul Hancock (and occasionally the Sydney Observatory)

  2. Transients are Extreme • Transients include the • Brightest • Fastest • Hottest • Most massive • Most magnetized • events in the universe. • (also the weirdest)

  3. Bright objects are useful outreach.atnf.csiro.au/education/senior/cosmicengine/stars_luminosity.html

  4. The cosmic distance ladder telescopes.stardate.org/research/cosmic_rulers/cds.php

  5. Cephieds J. Hartman (Harvard CfA) & K. Stanek (Ohio State U.)

  6. Brighter than a Cephied commons.wikimedia.org/wiki/File:SN1994D.jpg

  7. Type Ia Supernovae Accelerating ned.ipac.caltech.edu/level5/March08/Frieman/Frieman3.html www.lbl.gov/Science-Articles/Archive/sabl/2005/October/04-supernovae.html

  8. Pulsars lempel.pagesperso-orange.fr/un_os_dans_le_crabe_uk.htm

  9. Testing relativity Cumulative shift of periastron time (seconds) Periastron hermes.aei.mpg.de/lrr/2003/5 astronomy.swin.edu.au/cosmos/B/Binary+Pulsars

  10. (Invisible) Gas in the Milky Way Moniez, 2003, A&A, 412, 105 Susan Stolovy (SSC/Caltech) et al., JPL-Caltech, NASA

  11. Probing Interstellar Gas Feidler et al. 1994ApJ...430..581F Maitia et al. 2003ApJ...582..972M

  12. Stellar evolution (simple) chandra.harvard.edu/edu/formal/stellar_ev/

  13. Stellar interactions David Hardy/PPARC

  14. Flaring stars http://sohowww.nascom.nasa.gov/pickoftheweek/old/17dec2010/

  15. Black hole feeding

  16. Quasars painting by Don Dixon for Scientific American

  17. Summary • Transients and Variables offer us a unique probe of the universe • Supernovae and variables stars allow us to measure distances • Pulsars allow us to test general relativity • Scintillation allows us to see invisible gas in the Milky Way • Novae, and active stars allow us to understand the life cycle of stars • Tidal disruption events allow us to study accretion disks and jets

  18. What are we doing now to find transients? • Optical • PTF / SkyMapper • Radio • MWA/LOFAR/MeerKAT/ASKAP • X-ray/γ-ray • Swift/Fermi

  19. Current Optical Surveys www.astro.caltech.edu/palomar/scopes.html

  20. Future optical surveys www.lsst.org

  21. High energy surveys www.esa.int/ heasarc.nasa.gov/docs/swift/

  22. Current Radio Surveys Top-foto, Assen www.mwatelescope.org

  23. Upcoming Radio Surveys ASKAP/Vast KAT-7 / MeerKAT www.atnf.csiro.au/projects/askap/ - Terrace Photographers www.ska.ac.za - MaikWolleben

  24. The future of radio telescopes

  25. Summary • We have many surveys and telescopes that can find transients • The new surveys will give us a better understanding of the universe • The new surveys produce MUCH more data than we have had before • We need new ways to collect, organize and analyze the data • We are now entering the era of "Time domain astronomy" and there will be many new and exciting discoveries over the next decade.

  26. Question Time!

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