50 μas resolution VLBI images of AGN's at λ3 mm
- Creators
- Rantakyro, F. T.
- Bååth, L. B.
- Backer, D. C.
- Booth, R. S.
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Carlstrom, J. E.
- Emerson, D. T.
- Grewing, M.
- Hirabayashi, H.
- Hodges, M. W.
- Inoue, M.
- Kobayashi, H.
- Krichbaum, T. P.
- Kus, A. J.
- Moran, J. M.
- Morimoto, M.
- Padin, S.
- Plambeck, R. L.
- Predmore, R.
- Rogers, A. E. E.
- Schalinski, C.
- Witzel, A.
- Woody, D.
- Wright, M. C. H.
- Zensus, A.
Abstract
We present 15 images from the global mm-VLBI sessions in 1990 April at 100GHz and 1993 April at 86GHz. These observations probe the central engines of the 16 observed AGN's with up to 50 µas resolution. Among other sources previously observed with λ3mm VLBI we present the first λ3mm maps of 0735+178, 0748+126, 1055+018, 2145+067, and CTA102, in total we have been able to image 13 out of the 16 observed sources. 6 out of the 13 imaged sources observed exhibit curvature and rapid structural changes, although the low dynamic range in two thirds of the maps limits the detection of weak features. Most of the sources have unresolved cores even at this high resolution. There is substantial evidence that the observed sources can be grouped into two general groups: A misaligned population with parsec scale jets in the form of low pitch helices and an aligned population with straight jets with small changes in PA due to intrinsic bends.
Additional Information
© European Southern Observatory (ESO), 1998. Received July 3, 1997; accepted March 19, 1998. We would like to thank the people at the individual telescopes for helping in making the observations, without their support these observations would not have been possible. We would also like to thank the people at the Haystack correlator for their help in correlating these experiments. Without the help of D. Graham and A. Greve VLBI observations at Pico Veleta would not have been possible. We further would like to thank K. Standke for his help with the observation and calibration. Fredrik T. Rantakyrö acknowledges support for his research by the European Union under contract ERBCHGECT920011. Part of this research was carried out at the Onsala Space Observatory. Onsala Space Observatory at Chalmers University of Technology is the Swedish National Facility for Radio Astronomy. The Hat Creek array is operated by the Berkeley-Illinois-Maryland Association with funding from the National Science Foundation, Grant AST 93-20238 to the University of California. The NRAO is a facility of the National Science foundation, operated under cooperative agreement by Associated Universities, Incorporated. FCRAO is operated with support of the National Science Foundation under grant AST 91-15721 and with permission of the Metropolitan District Commission of the Commonwealth of Massachusetts. This is contribution number 819 of the Five College Astronomy Department. The work of T.P.K. was supported in part by the German Verbundforschung. The hydrogen maser and the VLBA terminal at Pico Veleta were financed by the Stiftung Volkswagenwerk. This research has made use of the NASA/IPAC Extra-galactic database (NED), which is operated by the Jet Propulsion Laboratory, Caltech, under contract with the National Aeronautics and Space Administration.Attached Files
Published - ds1432.pdf
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Additional details
- Eprint ID
- 86251
- Resolver ID
- CaltechAUTHORS:20180507-141344201
- ERBCHGECT920011
- European Union
- AST 93-20238
- NSF
- AST 91-15721
- NSF
- Verbundforschung
- Stiftung Volkswagenwerk
- NASA/JPL/Caltech
- Created
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2018-05-08Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field