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Two X-ray-selected BL Lacertae objects observed with the HEAO 1 scanning modulation collimator
Remillard, R. A.; Tuohy, I. R.; Brissenden, R. J. V.; Buckley, D. A. H.; Schwartz, D. A.; Feigelson, E. D.; Tapia, S.
AA(MIT, Cambridge, MA), AB(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia), AC(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia), AD(Mount Stromlo and Siding Spring Observatoires, Canberra, Australia), AE(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 140-147. Research supported by the U.S.-Australia Bilateral Science and Technology Agreement. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Active Galactic Nuclei, Bl Lacertae Objects, Sky Surveys (Astronomy), X Ray Sources, Astronomical Photometry, Heao 1, Linear Polarization, Radio Emission, Red Shift, Visible Spectrum
Bibliographic Code:


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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