Spectrum of Low-frequency Radio Emission from NGC 1275

Details Spectrum of Low-frequency Radio Emission from NGC 1275 Spectrum of Low-frequency Radio Emission from NGC 1275

Jul 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965natur.207...62r&link_type=abstract

Nature, Volume 207, Issue 4992, pp. 62-63 (1965).

Astronomy and Astrophysics

Astrophysics

11

Scientific paper

Two recent communications1,2 have described an anomalous feature in the spectrum of the radio emission from the Seyfert galaxy NGC 1275 (3C784) (ref. 3) at frequencies above 3,000 Mc/s (Fig. 1). Between 178 Mc/s and 3,000 Mc/s, measured flux densities can be fitted with a constant spectral index. At lower frequencies, measurements by Burke and Franklin4 at 22.2 Mc/s and, more recently, by Erickson and Cronyn5 at 26.3 Mc/s and by Williams6 at 38 Mc/s, have given flux densities greater that would be predicted using this spectral index. This communication describes some preliminary results of observations at 10.03 Mc/s and 22.25 Mc/s made using the new pencil beam T-shaped arrays at the Dominion Radio Astrophysical Observatory. The observations at these frequencies also show excessive flux densities for the source.

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