Observations of extragalactic sources with the Metsaehovi radio telescope at 22-87 GHz

Details Observations of extragalactic sources with the Metsaehovi radio telescope at 22-87 GHz Observations of extragalactic sources with the Metsaehovi radio telescope at 22-87 GHz

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt.........1t&link_type=abstract

Ph.D. Thesis Helsinki Univ. of Technology, Kylmaelae (Finland).

Computer Science

Bl Lacertae Objects, Brightness Temperature, Data Reduction, Extragalactic Radio Sources, Observatories, Quasars, Radio Galaxies, Radio Telescopes, Variability, Millimeter Waves, Superhigh Frequencies, Viewing

Scientific paper

This thesis presents the quasar monitoring program of the Metsahovi Radio Research Station. The program was started in 1980, and since then over 22000 quasar observations have been done at frequencies 12, 22, 37, 77 and 87 GHz. The data reduction procedure and the observational data from 1985.5 to 1990.5 are presented. The use of the data is demonstrated in 9 papers. Four of them use primarily the Metsahovi data and the remaining five are multifrequency efforts. The Metsahovi Radio Research Station is the only observatory where systematic monitoring of extragalactic sources is performed at frequencies higher than 20 GHz. Currently there are about 80 sources in our observing sample. The time scales in the quasar variability at 22 and 37 GHz are typically from some months to some years. From the time scales of the outbursts, brightness temperatures were calculated. In most cases they were well over the Compton limit 1012 K, thus requiring relativistic boosting. For different classes of sources different average viewing angles were found. For HPQ's theta less than 20 deg, for LPQ's 20 deg less than theta less than 40 deg and radio galaxies theta less than 30 deg.

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