Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393l..75d&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 393, no. 2, July 10, 1992, p. L75-L78. Research supported by Cali
Astronomy and Astrophysics
Astronomy
30
Cosmic Plasma, Interstellar Matter, Particle Acceleration, Pulsars, Speckle Holography, Supernova Remnants, Gum Nebula, Holographic Interferometry, Line Of Sight, Power Spectra, Radio Astronomy
Scientific paper
Observations of a speckle hologram of scattering material along the line of sight to the Vela pulsar indicate that this material is concentrated in the Vela supernova remnant, deep within the Gum Nebula. The speckle hologram is observed through the amplitude and phase variations of the interferometric cross-power spectrum with time and frequency. These variations describe the density fluctuations of the interstellar plasma, in a holographic fashion. The decorrelation due to the phase variations of the speckles yields the angular size of the scattering disk; comparison with the bandwidth of their amplitude variations yields a characteristic distance from earth to the scattering material of 0.81 +/- 0.03 of the distance from earth to the pulsar. This result is consistent with theories of irregularities associated with particle acceleration in shocks in supernova remnants.
Desai Ketan Mohanlal
Flanagan C.
Gwinn Carl R.
Jauncey Dave
Jones Llanwyn D.
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