Interstellar scintillation, ISS, and intrinsic variability of radio AGN
: David L. Jauncey, Jun Yi Koay, Hayley Bignall, Jean-Pierre Macquart, Tapio Pursimo, Marcello Giroletti, Talvikki Hovatta, Sebastian Kiehlmann, Barney Rickett, Anthony Readhead, Walter Max-Moerbeck, Harish Vedantham, Cormac Reynolds, James Lovell, Roopesh Ojha, Lucyna Kedziora-Chudczer
Publisher: Elsevier Ltd
: 2020
: Advances in Space Research
: Advances in Space Research
: 65
: 2
: 756
: 762
: 7
: 0273-1177
: 0273-1177
DOI: https://doi.org/10.1016/j.asr.2019.05.003
: https://acris.aalto.fi/ws/portalfiles/portal/33942031/ELEC_Jauncey_Interstellar_scintillation_JASR_14242.pdf
We
investigate the relationship between the 5 GHz interstellar
scintillation (ISS) and the 15 GHz intrinsic variability of the compact,
radio-selected active galactic nuclei (AGN) common to the
Microarcsecond Scintillation-Induced Variability (MASIV) Survey and the
Owens Valley Radio Observatory blazar flux density monitoring program.
As part of this investigation, we also re-examine the reported intrinsic
nature of the February 1990 VLA observations of the blazar S5 0716+714.
We are also examining the presence of IDV/ISS in the Owens Valley
15 GHz flux density monitoring data. We find a significant relationship
between the Owens Valley 15 GHz modulation index and the MASIV
modulation index. We also discuss the implications of these findings for
RadioAstron.
