Extragalactic 1 millimeter sources - Simultaneous observations at centimeter, millimeter, and visual wavelengths

Details Extragalactic 1 millimeter sources - Simultaneous observations at centimeter, millimeter, and visual wavelengths Extragalactic 1 millimeter sources - Simultaneous observations at centimeter, millimeter, and visual wavelengths

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268...68l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 68-75. NASA-supported research.

Other

47

Bl Lacertae Objects, Extragalactic Radio Sources, Millimeter Waves, Quasars, Astronomical Spectroscopy, Centimeter Waves, Infrared Spectra, Spectral Energy Distribution, Synchrotron Radiation, Ubv Spectra, Visible Spectrum

Scientific paper

Observations simultaneously made at visual (B, V, and R) wavelengths, at 1, 1.4, and 3.4 mm and at 1.3, 2, 6, and 20 cm of 9 QSOs and BL Lac objects are reported. The range of the millimeter-visual spectral index alphamv was only 0.65-0.82, typical of optically thin synchrotron emission. This may indicate that the electrons radiating synchrotron emission in this portion of the spectrum are not subjected to large radiation losses, and therefore relativistic bulk motion with Doppler factors of about 10 are required. The visual spectral index is much more broadly distributed and typically larger than alphamv. The spectral energy distributions have not changed much in the last two to five years except for 2251+15 and perhaps 0235+164. Only 1749+09 shows a sharp spectral break shortward of 1 mm. Sixteen other sources were observed at 1 mm, of which seven were detected.

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