Radio variability of the gamma-ray blazar 0202+149

Details Radio variability of the gamma-ray blazar 0202+149 Radio variability of the gamma-ray blazar 0202+149

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...358..451p&link_type=abstract

Astronomy and Astrophysics, v.358, p.451-461 (2000)

Astronomy and Astrophysics

Astrophysics

10

Galaxies: Active, Galaxies: Quasars: Individual: 0202+149, Radio Continuum: Galaxies

Scientific paper

Analysis of radio light curves of the gamma -ray bright blazar 0202+149 at frequencies of 37, 22, 14.5, 8, and 4.8 GHz during the period 1984-1998 reveals a 4-year cycle of variability with substructure on a shorter time scale of about 1.3-yr. The 4.8-37 GHz spectral index of the source gradually increases from -0.04 (T=1990.2) to 0.4 (T=1996.6) and during outbursts shows strong variations with a time scale of about 1 year and an amplitude up to ~ 0.4. VLBI images at 8, 22, and 43 GHz show a core-dominated structure with a faint jet in the northwest direction, which we trace out to 7 mas, with a bent inner part (r<=1 mas) consisting of at least 2 components. The connection of the jet activity with the 4-year cycle of total flux density variability is discussed.

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