4U1722 + 11 - The discovery of an X-ray selected BL Lac object

Details 4U1722 + 11 - The discovery of an X-ray selected BL Lac object 4U1722 + 11 - The discovery of an X-ray selected BL Lac object

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240...33g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 1, 1989, p. 33-39.

Astronomy and Astrophysics

Astronomy

17

Bl Lacertae Objects, Radio Sources (Astronomy), Sky Surveys (Astronomy), X Ray Sources, Continuous Spectra, Heao 2, Optical Polarization, Synchrotron Radiation, Very Large Array (Vla)

Scientific paper

The Uhuru X-ray source 4U1722 + 11 was observed using the microchannel-plate detector (High Resolution Imager) on the Einstein Observatory, and its coordinates measured to a precision of about 5 arcsec. A 16th-magnitude stellar object within the error circle was observed spectroscopically at CTIO, and at the AAT, and found to have a featureless continuum. Subsequent radio observations at the VLA have established that the object is a radio source at the level of 60 mJy, and optical polarization measurements have determined that the source exhibits variable polarization at the level of 10 percent. On the basis of these observations, it is concluded that 4U1722 + 11 is a member of the class of objects known as X-ray selected blazars of BL Lac objects.

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