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2009MNRAS.392.1339M - Mon. Not. R. Astron. Soc., 392, 1339-1362 (2009/February-1)
Probing the microarcsecond structure of the Circinus megamasers through diffractive interstellar scintillation.
McCALLUM J.N., ELLINGSEN S.P., LOVELL J.E.J., PHILLIPS C.J. and REYNOLDS J.E.
Abstract (from CDS):
The very long baseline interferometry (VLBI) images are consistent with previous high-resolution observations and show maser emission arising both in a circumnuclear accretion disc, and in a low-velocity outflow. We find no systematic differences in the variability properties of the disc and outflow masers. The VLBI images reveal that there is considerable spectral blending in single-dish spectra of the Circinus megamasers.
In addition to the VLBI imaging we also used these observations to look for a time delay in the intensity variations observed at the different telescopes in the array, as expected for scintillation-induced variability. No time delay was detected, which allows us to place a lower limit on the velocity of the interstellar medium during these observations 22 km/s for the second epoch. We conclude that any future attempts to measure a time delay in this source should utilize intercontinental baselines to increase the chances of success.
Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS
Journal keyword(s): masers - Scattering - galaxies: individual: Circinus
Simbad objects: 9
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