Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-02-11
Astronomy and Astrophysics
Astrophysics
63 pages including 9 eps figures and 9 tables, LateX, uses aaspp4.sty and tighten.sty, accepted for publication in ApJ
Scientific paper
10.1086/304219
We present the results of the multi-wavelength campaigns on 3C 273 in 1993-1995. During the observations in late 1993 this quasar showed an increase of its flux for energies greater equal 100 MeV from about 2.1 x 10^-7 photons/cm^2/s to approximately 5.6 x 10^-7 photons/cm^2/s during a radio outburst at 14.5, 22 and 37 GHz. However, no one-to-one correlation of the gamma-ray radiation with any frequency could be found. The photon spectral index of the high energy spectrum changed from (3.20 +- 0.54) to (2.20 +- 0.22) in the sense that the spectrum flattened when the gamma-ray flux increased. Fits of the three most prominent models (synchrotron self-Comptonization, external inverse Comptonization and the proton initiated cascade model) for the explanation of the high gamma-ray emission of active galactic nuclei were performed to the multi-wavelength spectrum of 3C 273. All three models are able to represent the basic features of the multi-wavelength spectrum. Although there are some differences the data are still not decisive enough to discriminate between the models.
No associations
LandOfFree
Multi-wavelength Observations of 3C 273 in 1993-1995 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multi-wavelength Observations of 3C 273 in 1993-1995, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-wavelength Observations of 3C 273 in 1993-1995 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-393064