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Browsing by Author "Jorstad, S.G."
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Discovery of a precessing jet nozzle in BL Lacertae
Stirling, A.M.; Cawthorne, T.V.; Stevens, J. A.; Jorstad, S.G.; Marscher, A.P.; Lister, M.; Gomez, J-L.; Smith, P.S.; Agudo, I.; Gabuzda, D.; Robson, E.I.; Gear, W.K. (2003) -
Jet Kinematics of AGNs at High Radio Frequencies
Jorstad, S.G.; Marscher, A.P.; Lister, M.; Stirling, A.M.; Cawthorne, T.V.; Gomez, J-L.; Gear, W.K.; Stevens, J. A.; Robson, E.I.; Smith, P.S.; Forster, J.R. (Astronomical Society of the Pacific, 2006)We have completed a 3 yr program of polarization monitoring of 15 active galactic nuclei with the Very Long Baseline Array at 7 mm wavelength. At some epochs the images are accompanied by nearly simultaneous polarization ... -
Modeling x-ray emission of a straight jet : PKS 0920-397
Schwartz, D.A.; Massaro, F.; Siemiginowska, A.; Worrall, D.M.; Birkinshaw, M.; Marshall, H.L.; Evans, D.; Perlman, E.; Gelbord, J.M.; Lovell, J.E.J.; Godfrey, L.; Bicknell, G.; Ojha, R.; Hardcastle, M.J.; Jester, S.; Jorstad, S.G.; Stawarz, L. (2010)We summarize a study of PKS 0920-397 using our 42 ks Chandra observation in conjunction with our ATCA 20GHz image, and HST/ACS F814W and F475W images. We investigate the hypothesis that the jet X–ray emission is due to ... -
Multi-frequency Polarization Properties of Blazars
Jorstad, S.G.; Marscher, A.P.; Stevens, J. A.; Robson, E.I.; Lister, M.; Stirling, A.M.; Smith, P.S.; Cawthorne, T.V.; Gomez, J-L.; Gabuzda, D.; Gear, W.K. (Astronomical Society of the Pacific, 2005)We have obtained total and polarized intensity images of 15 AGNs with the VLBA at 7 mm at 17 epochs, accompanied at many epochs by nearly simultaneous measurements of polarization at 1.35/0.85 mm and at optical wavelengths. ... -
Multiwaveband polarimetric observations of 15 active galactic nuclei at high frequencies: correlated polarization behaviour
Jorstad, S.G.; Marscher, A.P.; Stevens, J. A.; Smith, P.S.; Forster, J.R.; Gear, W.K.; Cawthorne, T.V.; Lister, M.; Stirling, A.M.; Gomez, J-L.; Greaves, J.S.; Robson, E.I. (2007) -
Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Jet Kinematics from Bimonthly Monitoring with the very Long Baseline Array
Marscher, A.P.; Jorstad, S.G.; Lister, M.; Stirling, A.M.; Cawthorne, T.V.; Gear, W.K.; Gomez, J-L.; Stevens, J. A.; Smith, P.S.; Forster, J.R.; Robson, E.I. (2005-10) -
Polarimetric Observations of 15 AGNs at High Frequencies
Jorstad, S.G.; Marscher, A.P.; Stevens, J. A.; Robson, I.; Lister, M.; Stirling, A.M.; Cawthorne, T.V.; Smith, P.S.; Gomez, J-L.; Gabuzda, D.; Gear, W.K. (Astronomical Society of the Pacific, 2005)We have obtained total and polarized intensity images of 15 AGNs with the VLBA at 7 mm at 17 epochs from 25/26 March 1998 to 14 April 2001. The VLBA observations are accompanied at many epochs by simultaneous mea- surements ...