6 papers
Survey of Planetary Nebulae at 30 GHz with OCRA-p
B. M. Pazderska, M. P. Gawronski, R. Feiler +9
We report the results of a survey of 442 planetary nebulae at 30 GHz. The purpose of the survey is to develop a list of planetary nebulae as calibration sources which could be used…
Flat-spectrum symmetric objects with ~1 kpc sizes I. The candidates
Pedro Augusto, J. Ignacio Gonzalez-Serrano, Ismael Perez-Fournon +1
In order to understand the origin and evolution of radio galaxies, searches for the youngest such sources have been conducted. Compact-medium symmetric objects (CSO-MSOs) are thoug…
An observational constraint on gravitational lensing by objects of mass 10^(9.5) - 10^(10.9) Mo
Pedro Augusto, Peter N. Wilkinson
A radio-based search for strong gravitational lensing, with image separations in the range 160-300 milliarcsec (mas), has yielded a null result for a sample of 1665 sources (August…
ARCS, The Arcminute Radio Cluster-lens Search - I. Selection Criteria and Initial Results
P. M. Phillips, I. W. A. Browne, P. N. Wilkinson
We present the results of an unbiased radio search for gravitational lensing events with image separations between 15 and 60 arcsec, which would be associated with clusters of gala…
Gravitational lensing statistics with extragalactic surveys. II. Analysis of the Jodrell Bank-VLA Astrometric Survey
P. Helbig, D. R. Marlow, R. Quast +3
We present constraints on the cosmological constant from gravitational lensing statistics of the Jodrell Bank-VLA Astrometric Survey (JVAS). Although this is the largest gr…
Time delay for the gravitational lens system B0218+357
A. D. Biggs, I. W. A. Browne, P. Helbig +3
Measurement of the time delay between multiple images of a gravitational lens system is potentially an accurate method of determining the Hubble constant over cosmological distance…