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Issue A&A
Volume 370, Number 1, April IV 2001
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010299



A&A 370, L9-L12 (2001)
DOI: 10.1051/0004-6361:20010299

Intra-day variability and the interstellar medium towards 0917+624

D. L. Jauncey1 and J.-P. Macquart2

1  Australia Telescope National Facility, CSIRO, Epping, NSW 2121, Australia
2  Research Centre for Theoretical Astrophysics, School of Physics, University of Sydney, NSW 2006, Australia

(Received 22 December 2000 / Accepted 14 February 2001)

Abstract
The intra-day variable source 0917+624 displays annual changes in its timescale of variability. This is explained in terms of a scintillation model in which changes in the variability timescale are due to changes in the relative velocity of the scintillation pattern as the Earth orbits the sun.


Key words: quasars, 0917+624 -- radio sources: ISM: structure -- scattering

Offprint request: D. L. Jauncey, djauncey@atnf.csiro.au

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© ESO 2001


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