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Multiwavelength Observations of 3C 273 in 1993–1995

C. von MontignyNAS/NRC Resident Research Associate, NASA/GSFCH. D. AllerAstronomy Department, University of Michigan, Dennison Building, Ann Arbor, MI 48109-1090M. F. AllerAstronomy Department, University of Michigan, Dennison Building, Ann Arbor, MI 48109-1090F. C. BruhweilerDepartment of Physics, Catholic University of America, Washington, DC 20064W. CollmarMax-Planck-Institut für extraterrestrische Physik, 85740 Garching, GermanyT. CourvoisierINTEGRAL Science Data Center, 16 Chemin d'Ecogia, CH-1290 Sauverny, SwitzerlandP. G. EdwardsInstitute of Space and Astronautical Science, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, JapanC. E. FichtelNASA/Goddard Space Flight Center, Code 661, Greenbelt, MD 20771Antonella FruscioneHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138G. GhiselliniOsservatorio di Brera-Merate, V. Bianchi, 46, Merate, ItalyR. C. HartmanNASA/Goddard Space Flight Center, Code 661, Greenbelt, MD 20771W. N. JohnsonE. O. Hulburt Center for Space Research, Code 7650, Naval Research Laboratory, Washington, DC 20375M. KafatosCenter for Earth Observations and Space Research, CSI, George Mason University, Fairfax, VA 22030T. KiiInstitute of Space and Astronautical Science, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, JapanD. A. KniffenHampden-Sydney College, P.O. Box 862, Hampden-Sydney, VA 23943G. LichtiMax-Planck-Institut für extraterrestrische Physik, 85740 Garching, GermanyF. MakinoInstitute of Space and Astronautical Science, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, JapanK. MannheimUniversitäts-Sternwarte, Geismarlandstrasse 11, D-37803 Göttingen, GermanyAlan P. MarscherDepartment of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215B. McBreenPhysics Department, University College, Belfield, Dublin 4, IrelandI. M. McHardyDepartment of Physics, University of Southampton, Southampton S09 5NH, UKJoseph E. PesceSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218M. PohlMax-Planck-Institut für extraterrestrische Physik, 85740 Garching, GermanyE. RamosCenter for Earth Observations and Space Research, CSI, George Mason University, Fairfax, VA 22030W. ReichMax-Planck-Institut für Radioastronomie, Bonn, GermanyE. I. RobsonJoint Astronomy Centre, 660 North Aohoku Place, Hilo, HI 96720Kanae SasakiInstitute of Space and Astronautical Science, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, JapanH. TerasrantaMetsähovi Radio Research Station, FIN-02540 Kylmala, FinlandM. TornikoskiMetsähovi Radio Research Station, FIN-02540 Kylmala, FinlandC. M. UrrySpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218E. ValtaojaMetsähovi Radio Research Station, FIN-02540 Kylmala, FinlandS. WagnerT. C. WeekesWhipple Observatory, Harvard-Smithsonian Center for Astrophysics, Box 97, Amado, AZ 85645

1997en

ABI

Annotatsiya

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 >= 100 MeV from about 2.1 x 10(exp -7) photons/sq cm.s to approximately 5.6 x 10(exp -7) photons/sq cm.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 GAMMA(sub gamma) = (3.20 +/- 0.54) to GAMMA(sub gamma) = (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.

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DOI: 10.1086/304219

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