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A new infrared spectral component of the quasar 3C273

Robson, E. I., Gear, Walter Kieran ORCID:, Brown, L. M. J., Courvoisier, T. J. L., Smith, M. G., Griffin, Matthew J. ORCID: 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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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

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