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A new infrared spectral component of the quasar 3C273

Robson, E. I., Gear, Walter Kieran, Brown, L. M. J., Courvoisier, T. J. L., Smith, M. G., Griffin, Matthew J. 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: 04 Jun 2017 04:18

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