Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sciam.237...32d&link_type=abstract
Scientific American, vol. 237, Aug. 1977, p. 32-39.
Astronomy and Astrophysics
Astronomy
Galactic Radiation, Luminous Intensity, Radio Sources (Astronomy), Radio Spectra, Absorption Spectra, Astronomical Models, Astronomical Photography, Compton Effect, Cosmology, Elliptical Galaxies, Galactic Radio Waves, Optical Polarization, Quasars, Synchrotron Radiation, Variable Stars
Scientific paper
Research on the strange and as yet unexplained BL Lac objects is summarized, with attention given to their featureless optical spectra, prodigious energy production, astounding variability (to 600 X in the case of PKS 2155-152) within brief time spans, inverted radio spectrum, and pronounced optical polarization. Occulted measures of the core and halo of the objects, possible synchrotron radiation and the inverse Compton catastrophe, location of the sources at cosmological distances or close to or in the local galaxy, identification with stars or remote galaxies, and possible independent mechanisms underlying the RF and optical spectra are considered. Puzzles concerning BL Lac objects are compared with puzzles involving quasars or elliptic galaxies. Objects specifically discussed include: OJ287, AP Librae, BL Lac, Markanen 501, and PKS 2155-152.
Disney Michael J.
Véron Pascal
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