CGRO, Radio and Optical Observations of the Quasar NRAO 140

Details CGRO, Radio and Optical Observations of the Quasar NRAO 140 CGRO, Radio and Optical Observations of the Quasar NRAO 140

1996-08-30

arxiv.org/abs/astro-ph/9609002v1

Astronomy and Astrophysics

Astrophysics

to appear in A&AS, Proc. of 3rd Compton Symposium, A&A Latex

Scientific paper

We report on Compton Gamma Ray Observatory (CGRO), radio and optical observations of the radio-loud, superluminal quasar NRAO 140. The source is not detected (at a significance of greater than 3 sigma) by any of the CGRO instruments OSSE, Comptel and EGRET. Radio observations simultaneous to the OSSE observation and optical monitoring over three-monthly intervals show no signs of extraordinary behaviour when compared to previous observations. We demonstrate that the CGRO non-detections do not require a spectral break at hard X-rays, but can be explained by a steep spectrum in the MeV range comparable to that of 3C273.

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