Quasi-simultaneous observations of 3C 273 by BeppoSAX and ASCA

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dc.creatorOrr, Astrid
dc.creatorYaqoob, T.
dc.creatorParmar, A. N.
dc.creatorPiro, L.
dc.creatorWhite, N. E.
dc.creatorGrandi, P.
dc.date1998-06-08
dc.date.accessioned2026-07-07T02:27:09Z
dc.date.available2026-07-07T02:27:09Z
dc.descriptionWe report the results of quasi-simultaneous observations of the bright quasar 3C 273 using the BeppoSAX Low-Energy Concentrator Spectrometer (LECS) and the ASCA Solid-State Imaging Spectrometer (SIS). These observations are part of an intercalibration programme and demonstrate good agreement between both instruments in the common energy range 0.5-10 keV. In particular, the absorption feature discovered by BeppoSAX/LECS at $\sim$ 0.5 keV is consistently seen by ASCA/SIS. We present the most accurate measurement yet of the spectral shape of this absorption feature and provide constraints on its physical interpretation. A self-consistent warm absorber model in photoionization equilibrium only gives an adequate spectral fit if a very high velocity inflow is allowed for the warm absorber (v $\sim$ 0.36 c). The ionization parameter and the column density of the warm absorber are then $\sim$ 1 and $\sim$ 1.3e21 cm^-2, respectively. If the differences in best-fit neutral absorption column density between the LECS and each SIS are taken as estimates of the systematic spectral uncertainties, then these are < 0.8e20 and < 2.e20 cm^-2 (at 90 % confidence) for SIS0 and SIS1, respectively.
dc.description7 pages, 2 Postscript figures, accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9806113
dc.identifierhttp://arxiv.org/abs/astro-ph/9806113
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/12567
dc.subjectAstrophysics
dc.titleQuasi-simultaneous observations of 3C 273 by BeppoSAX and ASCA
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