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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

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 are Extreme

  • Transients include the

    • Brightest

    • Fastest

    • Hottest

    • Most massive

    • Most magnetized

  • events in the universe.

  • (also the weirdest)


Bright objects are useful
Bright objects are useful

outreach.atnf.csiro.au/education/senior/cosmicengine/stars_luminosity.html


The cosmic distance ladder
The cosmic distance ladder

telescopes.stardate.org/research/cosmic_rulers/cds.php


Cephieds
Cephieds

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


Brighter than a cephied
Brighter than a Cephied

commons.wikimedia.org/wiki/File:SN1994D.jpg


Type ia supernovae
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


Pulsars
Pulsars

lempel.pagesperso-orange.fr/un_os_dans_le_crabe_uk.htm


Testing relativity
Testing relativity

Cumulative shift of periastron time (seconds)

Periastron

hermes.aei.mpg.de/lrr/2003/5

astronomy.swin.edu.au/cosmos/B/Binary+Pulsars


Invisible gas in the milky way
(Invisible) Gas in the Milky Way

Moniez, 2003, A&A, 412, 105

Susan Stolovy (SSC/Caltech) et al., JPL-Caltech, NASA


Probing interstellar gas
Probing Interstellar Gas

Feidler et al. 1994ApJ...430..581F

Maitia et al. 2003ApJ...582..972M


Stellar evolution simple
Stellar evolution (simple)

chandra.harvard.edu/edu/formal/stellar_ev/


Stellar interactions
Stellar interactions

David Hardy/PPARC


Flaring stars
Flaring stars

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



Quasars
Quasars

painting by Don Dixon for Scientific American


Summary
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


What are we doing now to find transients
What are we doing now to find transients?

  • Optical

    • PTF / SkyMapper

  • Radio

    • MWA/LOFAR/MeerKAT/ASKAP

  • X-ray/γ-ray

    • Swift/Fermi


Current optical surveys
Current Optical Surveys

www.astro.caltech.edu/palomar/scopes.html



High energy surveys
High energy surveys

www.esa.int/

heasarc.nasa.gov/docs/swift/


Current radio surveys
Current Radio Surveys

Top-foto, Assen

www.mwatelescope.org


Upcoming radio surveys
Upcoming Radio Surveys

ASKAP/Vast

KAT-7 / MeerKAT

www.atnf.csiro.au/projects/askap/ - Terrace Photographers

www.ska.ac.za - MaikWolleben



Summary1
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.



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