1WGA J2223.7-0206: A Narrow-Line Quasi-Stellar Object in the XMM-Newton field of view of 3C 445 *
Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF) del CNR, Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
Corresponding author: P. Grandi, firstname.lastname@example.org
Accepted: 30 January 2004
We report the discovery of a Narrow Line QSO located at about from the Broad Line Radio Galaxy 3C 445. The source, 1WGA J2223.7-0206, although already revealed by ROSAT, has never been optically identified previously. An XMM-Newton observation of 3C 445 has allowed, for the first time, an accurate X-ray spectral study of 1WGA J2223.7-0206, revealing an ultra-soft spectrum and fast flux variations typical of Narrow Line AGN. The 0.2–10 keV spectrum is well represented by a power law () plus a black body component ( eV) absorbed by Galactic . About of the X-ray flux ( 10-13 erg cm-2 s-1) is emitted below 2 keV. The keV flux is observed to decrease by about a factor 1.6 in about 5000 s. The optical observations, triggered by the X-ray study, confirm the Narrow Line AGN nature of this source. The continuum is blue with typical AGN emission lines, pointing to a redshift . The full width half maximum of Hβ and the flux ratio [O iii]/Hβ are 2000 km s-1 and 0.21, respectively. The optical luminosity (MR=-23.2) and the point-like appearance in the optical images identify 1WGA J2223.7-0206 as a Narrow Line QSO. From the optical-UV-X-ray Spectral Energy Distribution we obtain a lower limit of the bolometric luminosity of 1WGA J2223.7-0206 ( 1045 erg s-1) implying, for accretion rates close to the Eddington limit, a black hole mass .
Key words: galaxies: quasars: individual: 1WGA J2223.7-0206 / X-rays: galaxies
© ESO, 2004