Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.293..714b&link_type=abstract
Nature, vol. 293, Oct. 29, 1981, p. 714-717. NSF-supported research.
Astronomy and Astrophysics
Astronomy
72
Astronomical Spectroscopy, Galactic Radiation, Infrared Spectra, Quasars, Radio Frequencies, Compton Effect, Electron Distribution, Magnetic Fields, Polarized Radiation, Spectral Energy Distribution, Spectroscopic Telescopes, Synchrotron Radiation, X Ray Spectra
Scientific paper
The extremely red QSO 1413 + 135 shows characteristics typical of BL Lac objects: it has 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 less than 5 microns 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. It is calculated 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 100 to 1000.
Aller Hugh D.
Aller Margo F.
Bregman Joel N.
Glassgold Alfred E.
Hodge Philip E.
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