NASA NTRS · 19900023712
Two X-ray-selected BL Lacertae objects observed with the HEAO 1 scanning modulation collimator
Abstract
Two 16th magnitude BL Lac objects, H1101 - 232 and H1426 + 428, have been discovered. Each is a persistent and relatively bright X-ray source. A 2.7 percent linear polarization is measured in the optical emission or H101 - 232. The X-ray identification of H1426 + 428 is confirmed in an Exosat observation. The X-ray spectrum is well-modeled by a power law with an energy index of 1.19. Both BL Lac objects exhibit high f(x)/f(opt) ratios and they show a distinct resemblance to other X-ray selected BL Lac objects. The host galaxies are about 18th mag with angular diameters of about 20 arcsec and each may be the dominant member of a cluster of galaxies. Additional wide-slit spectroscopy reveals faint absorption features with redshifts of 0.129 for H1426 + 428 and 0.186 for H1101 - 232. The implied X-ray and optical luminosities exceed 10 to the 45th ergs/s for both BL Lac nuclei, assuming isotropic emission.
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Remillard, R. A., Tuohy, I. R., Brissenden, R. J. V., Buckley, D. A. H., Schwartz, D. A.. 1989-10-01. Two X-ray-selected BL Lacertae objects observed with the HEAO 1 scanning modulation collimator. https://ntrs.nasa.gov/citations/19900023712
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