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Discovery of Five New X-ray–Selected BL Lacertae Objects and Three New Quasars1

Published online by Cambridge University Press:  12 April 2016

G.Z. Xie
Affiliation:
Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China
W. Brinkmann
Affiliation:
Max-Planck-Institute für Extraterrestrische Physik, D-8046 Garching, Germany
G.W. Cha
Affiliation:
Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China
S. Laurent-Muehleisen
Affiliation:
Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA
Y.H. Zhang
Affiliation:
Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China
K.H. Li
Affiliation:
Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China
J.M. Bai
Affiliation:
Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China
F.K. Liu
Affiliation:
Yunnan Observatory, The Chinese Academy of Sciences, Kunming 650011, China

Extract

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Through combined ROSAT and VLA observations, we have identified 19 BL Lac/quasar candidates. In 1994 December, 1995 January and October, and 1996 January 1996, we obtained spectra of all 19 candidates using the 2.16-m telescope of Beijing Astronomical Observatory. The dispersion used is 195 Å mm−1, which yields a dispersion of about 4.65 Å pixel−1, and the wavelength coverage is 3500–7800 Å. Five of these objects are uniformly featureless, and we identify them as BL Lac objects. Three new quasars are also identified. Table 1 presents VLA positions and redshifts for the 5 new BL Lac objects and three new quasars. By checking them in the NASA/IPAC Extragalactic Database (NED) and Véron-Cetty & Véron’s (1993) Catalogue of Quasars and AGNs, and other recent reports about discovery of new BL Lac objects and quasars, we find that these sources are previously unreported.

Type
IX. Surveys and Properties of Active Galaxies and Related Sources
Copyright
Copyright © Astronomical Society of the Pacific 1997

Footnotes

1

This work is supported by the National Natural Science Foundation of China.

References

Véron-Cetty, M.-P., & Véron, P. 1993, ESO Scientific Report, No. 13.Google Scholar