Source Epoch Contour
PostScript
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GIF

1921-293

(OV -236)
QSO
z= 0.352
V= 17.

Notes (from the published papers): This is one of the strongest sources in the sky at millimeter wavelengths and has an unusually flat spectrum between 1 mm and 1 meter. At shorter wavelengths, the spectrum steepens and continues with a spectral index, $\alpha \sim$ -1 out to at least ultraviolet wavelengths (Shen et al.1997). The secondary feature is unusually diffuse. VLBA observations made at 7 mm in 1994 and in 1996 (Shen, Moran, \& Kellermann, in preparation) show that the jet curves sharply and is elongated along position angle near -23 degrees out to a distance of about 1 mas (4 parsecs) where there is an extension in the 7 mm image toward the diffuse jet which we see at 2 cm located about 6 mas away. Observations at 6 cm made in 1996 are consistent with the 7 mm and 2 cm observations, but 6 cm observations made in 1992 by Shen et al. (1997b) show a secondary feature which lies to the northwest rather than the northeast of the core. Curiously, there is no reported gamma-ray emission from this, one of the brightest known blazars (Mattox et al. 1997).

07/1995

10/1996

11/1999

03/2001

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ros@mpifr-bonn.mpg.de