Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243...47l&link_type=abstract
Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 47-52.
Astronomy and Astrophysics
Astronomy
29
Astronomical Photometry, Bl Lacertae Objects, Electromagnetic Spectra, Infrared Spectra, Radio Sources (Astronomy), Spectral Energy Distribution, X Ray Sources, Compton Effect, Quasars, Spectral Bands, Synchrotron Radiation
Scientific paper
A break in the optical-infrared spectrum of the X-ray-discovered candidate BL Lac object 1218 + 304 has been observed at a wavelength of about 1 micron. Two possible causes of the break are considered. One is that it is a high-frequency break in a synchrotron spectrum, resulting from radiation losses. The other is that the observed spectrum is a composite of a power-law spectrum and a galaxian spectrum. The radio through X-ray spectral flux distributions of the two X-ray-discovered BL Lac objects, 1218 + 304 and 2155 - 304, are quite similar. If the radio, infrared, and optical radiation have a common origin in an inhomogeneous synchrotron source, then the observed slope of the X-ray spectrum makes it unlikely that the X-radiation is produced by Compton scattering. The observed soft X-radiation from BL Lac objects is better explained as the high-frequency tail of a synchrotron spectrum. The low radio:optical spectral-flux ratios of 1284 + 304 and 2155 - 304 suggest that this ratio may be inversely related to the break frequency for BL Lac objects. In that case, there may be BL Lac objects which have spectral breaks in the ultraviolet, flat optical spectra, and very weak radio emission. Such objects would most easily be discovered through their X-ray emission.
Ledden J. E.
Odell S. L.
Stein Wayne A.
Wisniewski Weislaw Z.
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