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Preprint 13g/99


Multifrequency Observations of the Virgo Blazars 3C 273 and 3C 279 in CGRO Cycle 8

W. Collmar (1), S. Benlloch (2), J.E. Grove (3), R.C. Hartman (4), W.A. Heindl (5), A. Kraus (6), H. Teräsranta (7), M. Villata (8), K. Bennett (9), H. Bloemen (10), W.N. Johnson (3), T.P. Krichbaum (6), C.M. Raiteri (8), J. Ryan (11), G. Sobrito (8), V. Schönfelder (1), O.R. Williams (9), J. Wilms (2)

(1) Max­Planck­Institut für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany
(2) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(3) Naval Research Lab., 4555 Overlook Av., SW, Washington, DC 20375­5352, USA
(4) NASA/Goddard Space Flight Center, Greenbelt, MD 20771
(5) Center for Astrophysics and Space Sciences, UCSD, La Jolla, CA, USA
(6) Max­Planck­Institut für Radioastronomie, D­53121 Bonn, Germany
(7) Metsähovi Radio Research Station, FIN­02540 Kylmälä, Finland
(8) Osservatorio Astronomico di Torino, I­10025 Pino Torinese, Italy
(9) Astrophysics Division, ESTEC, NL­2200 AG Noordwijk, The Netherlands
(10) SRON­Utrecht, Sorbonnelaan 2, NL­3584 CA Utrecht, The Netherlands
(11) Universtity of New Hampshire, Durham NH 03824­3525, USA

To appear in: Proc. of the 5th Compton Symposium, ed. M. McConnell

Abstract. We report first observational results of multifrequency campaigns on the prominent Virgo blazars 3C 273 and 3C 279 which were carried out in January and February 1999. Both blazars are detected from radio to gamma­ray energies. We present the measured X­ to gamma­ray spectra of both sources, and for 3C 279 we compare the 1999 broad­band (radio to gamma­ray) spectrum to measured previous ones.

Key words: -

Paper (70k gzip'ed Postscript including figures)


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