Radio Transients - PowerPoint PPT Presentation

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Radio Transients

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Radio Transients – PowerPoint PPT presentation

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Title: Radio Transients


1
Radio TransientsEVLA Deep Fields
  • Joseph Lazio
  • Naval Research Laboratory
  • SKA Project Scientist

2
The Dynamic Radio Sky
  • Sub-stellar objects
  • Brown dwarfs
  • Extrasolar planets?
  • Microquasars
  • Scintillation
  • UHECRs
  • EM counterparts to GW sources?
  • ETI
  • Exploding black holes
  • ???
  • Neutron stars
  • Magnetars
  • Giant pulses
  • Short GRBs?
  • GRBs (g-ray loud g-ray quiet?)
  • Afterglows
  • Prompt emission?

Amplitude
Frequency (MHz)
Time
Rotating Radio Transients (RRATS)
Pulsating Brown Dwarfs
Unknowns
3
Wide-field SKA Precursors
Karoo Array Telescope (meerKAT, ZA)
  • Large-NumberSmall-Diameter Arrays
  • Galaxy Assembly Evolution, Gravitational
    Physics, Dynamic Radio Sky,
  • Field of view expansion
  • Signal transmission
  • Processing and data management
  • Novel antenna construction methods
  • Wide-band feeds

4
Staring Observations
GCRT J1746-2757
XTE J1748-288
GCRT J1742-3001
GCRT J1745-3009
Hyman et al.
Bower et al.
  • Series of transients found by repeated
    observations of same field by VLA!

5
Low-Mass Stars and Brown Dwarfs
  • Low-mass stars and brown dwarfs show a rich
    variety of phenomena
  • Probably driven by magnetic fields
  • Brown dwarf magnetosphere / emission mechanism
  • Connection to pulsar magnetosphere?
  • Largely unexplored 1 GHz
  • Unavoidable!

TVLM 513-46546 (Hallinan et al.)
Optical survey telescopes
6
Dynamic Radio Sky and 21st Century Astrophysics
  • Transient sources are necessarily compact
  • Locations of explosive or dynamic events
  • Probe fundamental physics and astrophysics
  • Radio signals modified by, and are powerful
    probes of, intervening media
  • Dispersion
  • Scattering
  • Faraday rotation
  • Media include
  • Interplanetary medium (IPM)
  • Interstellar medium (ISM)
  • Intergalactic medium (IGM)

EVLA
Optical survey telescopes
X- and g-rays
LIGO, LISA
7
Transients EVLA H I Deep Field
  • Legacy programs long-lasting value to broad
    community (viz. Hubble Deep Field)
  • H I Deep Field (and others!) should not preclude
    transients observations
  • Angular resolution
  • Cadence

Pulsating Brown Dwarfs
Unknowns
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