An eruptive BL Lacertae object with a high redshift, 0846 + 51 W1

Details An eruptive BL Lacertae object with a high redshift, 0846 + 51 W1 An eruptive BL Lacertae object with a high redshift, 0846 + 51 W1

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230...68a&link_type=abstract

Astrophysical Journal, Part 1, vol. 230, May 15, 1979, p. 68-78. Research supported by the Nederlandse Organisatie voor Zuiver-

Astronomy and Astrophysics

Astrophysics

46

Bl Lacertae Objects, Red Shift, Astronomical Catalogs, Graphs (Charts), Light Curve, Position (Location), Radio Spectra, Spectrum Analysis

Scientific paper

The optical counterpart of the radio source 0846 + 51W1 was observed to brighten from V of about 19.5 mag to V = 15.7 mag in less than one month. Additional optical and radio observations are reported. They show: (1) at maximum light outburst, the continuum is featureless and the object has all the radio and optical characteristics of a BL Lacertae object (except polarization, which is unknown); (2) the normal light level V is between 19 and 21 mag; (3) throughout its phases, the optical B-V and U-B colors are appreciably redder than any quasar; (4) the spectrum at minimum light has emission lines that yield a redshift of z = 1.860, which is the highest redshift so far found for a BL Lacertae object; (5) the BL Lacertae object lies only 12 arcsec south of the southern member of a pair of interacting spirals; (6) one possible emission line is not identified in the z = 1.86 redshift system. This line could be part of a second emission-line redshift system, but this would require confirmation by additional observation.

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