ASCA Observations of the Broad-Line Radio Galaxy 3C 445

Details ASCA Observations of the Broad-Line Radio Galaxy 3C 445 ASCA Observations of the Broad-Line Radio Galaxy 3C 445

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...495..749s&link_type=abstract

Astrophysical Journal v.495, p.749

Astronomy and Astrophysics

Astronomy

33

Galaxies: Active, Galaxies: Individual Alphanumeric: 3C 445, X-Rays: Galaxies

Scientific paper

We present the first high-resolution X-ray observation of the nearby (z = 0.057) broad-line radio galaxy 3C 445 obtained with ASCA in 0.6-10 keV. The earlier detection of the Fe K alpha line is confirmed. The ASCA data are best fitted by a model involving complex absorption (dual absorber), where an intrinsically flat ( Gamma ~ 1.3) continuum is seen through two distinct layers of absorption of cold gas with column densities N1_{{H}}~1023 cm-2 and N2_{{H}}~6x1022 cm-2, both larger than the column derived from the optical reddening. Fits with this model to the nonsimultaneous ROSAT and ASCA data put tighter constraints on the continuum parameters. With the continuum described by a dual absorber the Fe K alpha line has an EW ~ 270 eV and a width sigma ~ 0.2 keV, implying an origin in neutral gas moving with velocities <~35,000 km s-1. However, the presence of complex absorption in the nucleus of this type 1 active galactic nucleus (AGN) is unexpected in the context of current unification models. A statistically good fit to the ASCA data is also provided by a power-law plus Compton reflection model; however, this model is physically implausible because of the weak (EW ~ 80 eV) Fe line and unrealistically high (~1046 ergs s-1) luminosity inferred. Among BLRGs observed with ASCA, 3C 445 sticks out as a moderately luminous source with an unusually complex spectrum at soft X-rays.

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