H1722 + 119 - A highly polarized X-ray-selected BL Lacertae object

Details H1722 + 119 - A highly polarized X-ray-selected BL Lacertae object H1722 + 119 - A highly polarized X-ray-selected BL Lacertae object

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..578b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 20, 1990, p. 578-584. Research supported by the Australian Depart

Astronomy and Astrophysics

Astronomy

17

Bl Lacertae Objects, Polarized Electromagnetic Radiation, Radio Galaxies, X Ray Sources, Heao 1, Magnitude, Sky Surveys (Astronomy), Ubv Spectra

Scientific paper

A 15th-mag, X-ray-selected BL Lac object, H1722 + 119, has been discovered to possess a steep X-ray spectrum with power-law energy index near 1.3; radio measurements indicate a variable, compact source with 1.4-4.9 GHz power-law energy index of 0.04. The optical-IR polarization of H1722 + 119 reaches a maximum of 17 percent, which is much higher than other X-ray-selected BL Lac objects. The degree of polarization is found to be wavelength-dependent, decreasing monotonically toward the IR.

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