A flare in the infrared to radio continuum spectrum of 3C273

Robson, E. I., Gear, Walter Kieran ORCID: https://orcid.org/0000-0001-6789-6196, Ade, Peter A. R. ORCID: https://orcid.org/0000-0002-5127-0401 and Nolt, I. G. 1985. A flare in the infrared to radio continuum spectrum of 3C273. Presented at: Conference on Active Galactic Nuclei, Manchester, England, 1984. Published in: Dyson, John Edward ed. Active Galactic Nuclei (A86-36901 16-90). Manchester, UK: Manchester University Press, pp. 147-151.

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Abstract

A well-defined outburst has been observed in the continuum spectrum of the quasar 3C273. The flare propagated from the submillimeter region to the radio, while at the same time decaying in the near- and far-infrared. Subsequent monitoring has shown that within the space of a year the source has attained its quiescent continuum level at all wavelengths shorter than 20 microns. The near- and far-infrared spectral shape of the flare was similar to the quiescent spectrum, but a pronounced peak was observed in the short millimeter region. This peak, compatible with synchrotron self-absorption, was seen to propagate to longer wavelengths over a time of two months. The timescale and energetics of the flare suggest a major outburst of energy from a region within a parsec of the nucleus. Precise details depend critically on whether isotropic or relativistic beaming are assumed. The data are consistent with a relativistic beaming model.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Manchester University Press
ISBN:	9780719010972
Last Modified:	27 Oct 2022 10:02
URI:	https://orca.cardiff.ac.uk/id/eprint/68637

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