Radio and optical evolution of the Seyfert galaxy NGC 1275.

Details Radio and optical evolution of the Seyfert galaxy NGC 1275. Radio and optical evolution of the Seyfert galaxy NGC 1275.

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296..628n&link_type=abstract

Astronomy and Astrophysics, v.296, p.628

Astronomy and Astrophysics

Astrophysics

12

Galaxies: Active, Galaxies: Seyfert, Galaxies: Ngc 1275, Radio Continuum: Galaxies

Scientific paper

The results of extensive observations of the Seyfert galaxy NGC 1275 carried out at the radio frequencies 22GHz, 37GHz and 87GHz, and in the optical V band are presented. Two types of variations in the continuum emission of the galaxy nucleus are found. Fast outbursts occur at radio frequencies 5-6years after the corresponding optical events. These outbursts are identified with shocks forming in the radio jet. They also correspond to ejections of new VLBI components from the core. The second type of variation is caused by a slowly changing component having a time delay of =~8years between radio and optical domains. We propose that this variation results from a period of enhanced accretion rate in the nucleus, beginning in the 1950s and ending around 1980, and leading to the growth and subsequent decay of the radio emitting jet. Linear extrapolation of the expansion speeds of these two types of components indicates that the true galaxy nucleus is located at a distance of a few parsecs from the radio core (the beginning of the visible jet). This estimate would place the nucleus halfway between the 'radio core' and the recently discovered 'counterjet'.

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