1 / 26

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

dava
Télécharger la présentation

Variables and Transients

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!

More Related