Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..283a&link_type=abstract
Astronomy Reports, Volume 42, Issue 3, May 1998, pp.283-292
Astronomy and Astrophysics
Astronomy
9
Scientific paper
survey of compact (theta < 1) radio sources was conducted at 102 MHz on the Large Phased Array of the Lebedev Institute of Physics using interplanetary scintillation observations. The survey covers a 0.097ster area of the 7C survey in the direction alpha = 10h28m and delta = 41. A total of 289 scintillating radio sources were detected. A survey of two areas of the 7C survey enabled the detection of 395 compact radio sources, 380 for the first time. The scintillating source counts for these two areas confirm the sharp decrease of the density of compact radio sources at weak flux densities indicated by observations of the first area alone. Toroughly S = 0.6 Jy, the differential scintillating source counts differ little from the source counts expected for a Euclidean Universe, however, a drop-off in the source count curve is observed for S < 0.6 Jy. This dropoff is significantly steeper than that for counts of extended sources from the 7C survey. This supports our earlier conclusion that compact and extended sources exhibit different cosmological evolution.
Artyukh V. A.
Isaev E. A.
Tyul'bashev S. A.
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