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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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