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Title: 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. 37 refs.

Authors:
; ; ; ;  [1]
  1. (MIT, Cambridge, MA (USA) Mount Stromlo and Siding Spring Observatories, Canberra (Australia) Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA))
Publication Date:
OSTI Identifier:
5028510
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; (USA); Journal Volume: 345
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BL LACERTAE OBJECTS; X RADIATION; COSMIC X-RAY SOURCES; GALAXY NUCLEI; LUMINOSITY; PHOTOMETRY; POLARIZATION; RADIOWAVE RADIATION; RED SHIFT; SURVEYS; VISIBLE SPECTRA; COSMIC RADIO SOURCES; COSMIC RAY SOURCES; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIATIONS; SPECTRA; 640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources

Citation Formats

Remillard, R.A., Tuohy, I.R., Brissenden, R.J.V., Buckley, D.A.H., and Schwartz, D.A. Two X-ray-selected BL Lacertae objects observed with the HEAO 1 scanning modulation collimator. United States: N. p., 1989. Web. doi:10.1086/167888.
Remillard, R.A., Tuohy, I.R., Brissenden, R.J.V., Buckley, D.A.H., & Schwartz, D.A. Two X-ray-selected BL Lacertae objects observed with the HEAO 1 scanning modulation collimator. United States. doi:10.1086/167888.
Remillard, R.A., Tuohy, I.R., Brissenden, R.J.V., Buckley, D.A.H., and Schwartz, D.A. Sun . "Two X-ray-selected BL Lacertae objects observed with the HEAO 1 scanning modulation collimator". United States. doi:10.1086/167888.
@article{osti_5028510,
title = {Two X-ray-selected BL Lacertae objects observed with the HEAO 1 scanning modulation collimator},
author = {Remillard, R.A. and Tuohy, I.R. and Brissenden, R.J.V. and Buckley, D.A.H. and Schwartz, D.A.},
abstractNote = {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. 37 refs.},
doi = {10.1086/167888},
journal = {Astrophysical Journal; (USA)},
number = ,
volume = 345,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 1989},
month = {Sun Oct 01 00:00:00 EDT 1989}
}