A new infrared spectral component of the quasar 3C273

Robson, E. I., Gear, Walter Kieran ORCID: https://orcid.org/0000-0001-6789-6196, Brown, L. M. J., Courvoisier, T. J. L., Smith, M. G., Griffin, Matthew J. ORCID: https://orcid.org/0000-0002-0033-177X and Blecha, A. 1986. A new infrared spectral component of the quasar 3C273. Nature 323 , pp. 134-136. 10.1038/323134a0

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Abstract

Following the dramatic infrared to millimetre-wavelength flare seen in the quasar 3C273 during 19831, we have continued to monitor its overall continuum emission. Recent measurements show that the 10-µm to 3-mm emission has decayed to a level well below any seen previously2,3, while the 1–4-µm emission has remained relatively constant. This behaviour has revealed the presence of an apparently non-variable component which dominates the near-infrared emission in 3C273 and includes the small ‘bump’ at ~3.5 µm in the power-law continuum previously noted by Neugebauer et al. 3. The origin of this component is probably not thermal re-radiation by dust grains but may be due to free–free emission from very dense, broad-line clouds4.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Macmillan Publishers Ltd.
ISSN:	0028-0836
Last Modified:	21 Oct 2022 09:26
URI:	https://orca.cardiff.ac.uk/id/eprint/36385

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