A BeppoSAX observation of 3C273: broadband spectrum and detection of a low-energy absorption feature
P. Grandi, M. Guainazzi, T. Mineo, A. N. Parmar, F. Fiore, A. Matteuzzi, F. Nicastro, G. C. Perola, L. Piro, M. Cappi, G. Cusumano, F. Frontera, S. Giarrusso, E. Palazzi, S. Piraino
Abstract
We report the results of a 3C273 observation performed during the Science Verification Phase (SVP) of the BeppoSax satellite. The broad-band spectrum is well represented by a power-law between 1 keV and 200 keV. The spectral slope is flat (Γ~1.6) with a weak emission line at ~ 6.4 keV (rest frame) of EW ~ 30 eV. Below 1 keV, a deviation from a power-law due to an absorption feature plus a soft component is present. This is the first time that a feature in absorption at ~ 0.5 keV (observer frame) is unambiguously detected in 3C273.
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