Evidence for a circumnuclear and ionized absorber in the X-ray obscured broad-line radio galaxy 3C 445
Article first published online: 28 APR 2011
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
Monthly Notices of the Royal Astronomical Society
Volume 414, Issue 3, pages 2739–2750, July 2011
How to Cite
Braito, V., Reeves, J. N., Sambruna, R. M. and Gofford, J. (2011), Evidence for a circumnuclear and ionized absorber in the X-ray obscured broad-line radio galaxy 3C 445. Monthly Notices of the Royal Astronomical Society, 414: 2739–2750. doi: 10.1111/j.1365-2966.2011.18590.x
- Issue published online: 21 JUN 2011
- Article first published online: 28 APR 2011
- Accepted 2011 February 23. Received 2011 February 22; in original form 2010 December 16
- galaxies: active;
- galaxies: individual: 3C 445;
- X-rays: galaxies
Here we present the results of a Suzaku observation of the broad-line radio galaxy 3C 445. We confirm the results obtained with the previous X-ray observations which unveiled the presence of several soft X-ray emission lines and an overall X-ray emission which strongly resembles a typical type 2 Seyfert galaxy despite of the optical classification as an unobscured active galactic nucleus.
The broad-band spectrum allowed us to measure for the first time the amount of reflection (R∼ 0.9) which together with the relatively strong neutral Fe Kα emission line (EW ∼ 100 eV) strongly supports a scenario where a Compton-thick mirror is present. The primary X-ray continuum is strongly obscured by an absorber with a column density of NH= 2–3 × 1023 cm−2. Two possible scenarios are proposed for the absorber: a neutral partial covering or a mildly ionized absorber with an ionization parameter logξ∼ 1.0 erg cm s−1. A comparison with the past and more recent X-ray observations of 3C 445 performed with XMM–Newton and Chandra is presented, which provided tentative evidence that the ionized and outflowing absorbers varied. We argue that the absorber is probably associated with an equatorial disc wind located within the parsec scale molecular torus.