Multifrequency observations of the red QSO 1413 + 135

Joel N. Bregman, Marcia J. Lebofsky, Margo F. Aller, George H. Rieke, Hugh D. Aller, Philip E. Hodge, A. E. Glassgold, Patrick J. Huggins

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


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 102-103.

Original languageEnglish (US)
Pages (from-to)714-717
Number of pages4
Issue number5835
StatePublished - 1981

ASJC Scopus subject areas

  • General


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