Annual Modulation in Intraday Variability Timescales of Extragalactic Radio Sources

Details Annual Modulation in Intraday Variability Timescales of Extragalactic Radio Sources Annual Modulation in Intraday Variability Timescales of Extragalactic Radio Sources

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chjaa...1..133q&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 1, p. 133-143

Astronomy and Astrophysics

Astrophysics

5

Scattering, Ism: Kinematics, Bl Lacertae Objects: Individual: 0716+71, Quasars: Individual: 0917+62, Radiation Mechanisms: Non-Thermal

Scientific paper

Annual modulations in timescales of intraday variability (IDV hereafter) are discussed for six extragalactic sources: 0716+714, 0917+624, 0954+65, 1749+70, 1803+78 and 2007+77. The timescales calculated from scintillation theory are compared with the observational data. It is emphasized that systematic observations are required to identify the phenomenon and to determine the motion of the interstellar medium with respect to the Local Standard of Rest. In addition, significant deviations from the annual modulation could be due to intrinsic variations.

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