Multi-Frequency Observations of Gamma-Ray Blazar 1633+382
Abstract
We perform monthly monitoring of the quasar 1633+382 (4C+38.41) within a sample of γ-ray blazars with the VLBA at 43 GHz along with optical photometric and polarimetric observations. We construct the γ-ray light curve of 1633+382 using data obtained by the Fermi LAT. We find that a high γ-ray state of the quasar starting in 2009 September is simultaneous with an increase of the flux in the mm-wave VLBI core. We resolve a superluminal feature on the VLBA images that appears to be responsible for the mm-wave flux increase. We find a strong correlation between optical and γ-ray light curves with a delay of γ-ray variations of 5±3 days, as well as a strong correlation between optical flux and degree of polarization during the high γ-ray state. Comparison between the optical polarization position angle and that in the VLBI core supports the idea that in the quasar 1633+382 a high γ-ray state is connected with processes originating near the mm-VLBI core.
- Publication:
-
Journal of Astrophysics and Astronomy
- Pub Date:
- June 2011
- DOI:
- 10.1007/s12036-011-9038-z
- Bibcode:
- 2011JApA...32..239J
- Keywords:
-
- Gamma-rays;
- quasars: 1633+382(4C+38.41);
- radio jets;
- polarization;
- Gamma-rays—quasars: 1633+382(4C+38.41)—radio jets—polarization.