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Pearson-Readhead Survey from Space

Published online by Cambridge University Press:  13 May 2016

R.A. Preston ,
M.L. Lister ,
S. J. Tingay ,
B.G. Piner ,
D.W. Murphy ,
D. L. Jones ,
D.L. Meier ,
T.J. Pearson ,
A. C. S. Readhead  and
H. Hirabayashi
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R.A. Preston
Affiliation:
1 Jet Propulsion Laboratory, California Institute of Technology, USA
M.L. Lister
Affiliation:
1 Jet Propulsion Laboratory, California Institute of Technology, USA
S. J. Tingay
Affiliation:
2 Australia Telescope National Facility, Narrabri, Australia
B.G. Piner
Affiliation:
1 Jet Propulsion Laboratory, California Institute of Technology, USA
D.W. Murphy
Affiliation:
1 Jet Propulsion Laboratory, California Institute of Technology, USA
D. L. Jones
Affiliation:
1 Jet Propulsion Laboratory, California Institute of Technology, USA
D.L. Meier
Affiliation:
1 Jet Propulsion Laboratory, California Institute of Technology, USA
T.J. Pearson
Affiliation:
3 California Institute of Technology, Pasadena, USA
A. C. S. Readhead
Affiliation:
3 California Institute of Technology, Pasadena, USA
H. Hirabayashi
Affiliation:
4 Institute of Space and Astronautical Science, Sagamihara, Japan
H. Kobayashi
Affiliation:
5 National Astronomical Observatory, Mitaka, Tokyo, Japan
M. Inoue
Affiliation:
6 Nobeyama Radio Observatory, Minamisaku, Nagano, Japan

Abstract

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We are using the VSOP space VLBI mission to observe a complete sample of Pearson-Readhead survey sources at 4.8 GHz to determine core brightness temperatures and pc-scale jet properties. To date we have imaged 27 of the 31 objects in our sample. Our preliminary results show that the majority of objects contain strong core components that remain unresolved on baselines of 30,000 km. The brightness temperatures of several cores significantly exceed 1012 K, which is indicative of highly relativistically beamed emission. We also find that core brightness temperature is correlated with intraday variability in compact AGNs.

Type
The Inner Regions of Galaxies
Information
Symposium - International Astronomical Union , Volume 205: Galaxies and their Constituents at the Highest Angular Resolutions , 2001 , pp. 124 - 125
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

Pearson, T. J. & Readhead, A. C. S. 1988, ApJ, 328, 114.CrossRefGoogle Scholar
Readhead, A. C. S. 1994, ApJ, 426, 51.CrossRefGoogle Scholar
Kellermann, K. I. & Pauliny-Toth, I. I. K. 1969, ApJ, 155, L7.CrossRefGoogle Scholar