Multifrequency observations of the red QSO 1413 + 135

The extremely red QSO 1413 + 135 shows characteristics typical of BL Lac objects—no emission lines, is embedded in a luminous galaxy, is subject to rapid radio and IR variability, has an inverted radio spectrum and shows substantial IR polarization. The rapid steepening of the nonthermal spectrum at...

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Bibliographic Details
Published in:Nature (London) 1981-10, Vol.293 (5835), p.714-717
Main Authors: Bregman, Joel N, Lebofsky, Marcia J, Aller, Margo F, Rieke, George H, Aller, Hugh D, Hodge, Philip E, Glassgold, A. E, Huggins, Patrick J
Format: Article
Language:English
Subjects:
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
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Summary:The extremely red QSO 1413 + 135 shows characteristics typical of BL Lac objects—no emission lines, is embedded in a luminous galaxy, is subject to rapid radio and IR variability, has an inverted radio spectrum and shows substantial IR polarization. The rapid steepening of the nonthermal spectrum at λ < 5 µm is interpreted as synchrotron emission from an electron distribution that ends sharply at some maximum energy. The X-ray emission is probably inverse Compton radiation. We calculate that the optically thin emitting region is compact, has a large magnetic field and exhibits bulk relativistic motion towards the observer. The most energetic electrons in the emitting region have a Lorentz factor of 10 2 –10 3 .
ISSN:0028-0836
1476-4687
DOI:10.1038/293714a0