Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101..315g&link_type=abstract
Astronomy and Astrophysics, vol. 101, no. 3, Sept. 1981, p. 315-319.
Astronomy and Astrophysics
Astronomy
10
Decimeter Waves, Extragalactic Radio Sources, Microwave Spectra, Radio Astronomy, Cosmology, Quasars, Radiant Flux Density, Size (Dimensions)
Scientific paper
A sample of 61 sources showing very steep spectra between 327 and 2700 MHz (α2370327 ≤ -1.1) has been selected from 577 sources originally observed in the Ooty lunar occulation survey at 327 MHz which goes ∼3 times deeper than the 4C survey. Compared to sources having normal spectra (-0.5 < α2370327 -1.1), the very steep spectrum sources are found to show a considerably smaller optical identification percentage and smaller angular sizes. Their angular sizes, however, look very similar to those of the 3C/4C quasars (median redshift ∼0.9). Using the present measurements in conjunction with published data, it is found that the fraction of sources having a very steep spectrum (α2370327 ≤ -1.1) depends on flux density and appears to reach a peak value (of about 1/6) at intermediate flux densities of ∼1.5 Jy at 408 MHz, a behaviour like that of the normalised differential counts of radio sources in metre wavelength surveys. Possible cosmological implications of these results are briefly discussed.
Gopal-Krishna
Steppe H.
No associations
LandOfFree
Extragalactic radio sources with very steep decimetrewave spectrum does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Extragalactic radio sources with very steep decimetrewave spectrum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extragalactic radio sources with very steep decimetrewave spectrum will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1512496