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: | 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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