Multiwavelength studies of the Seyfert 1 galaxy NGC 7469 II. X-ray and UV observations with XMM-Newton
Abstract
We present an XMM-Newton observation of NGC 7469, including studies of the X-ray and UV variability, 0.2-10 keV spectral continuum, Fe Kalpha emission line and the first-ever high-resolution X-ray spectrum of the soft X-ray warm absorber. We compare the properties of this X-ray warm absorber with the UV warm absorber as seen in a FUSE observation one year previously. The 0.2-10 keV spectral continuum is best fitted by a power-law plus two blackbody model. An Fe Kalpha emission line is visible which consists of a single narrow component and is well-modelled by a simple Gaussian. Narrow absorption and emission lines in the soft X-ray RGS spectrum demonstrate the existence of a multi-phase warm absorber with a range in log xi of ~ 2 to ~ -2 where xi is in erg cm s-1. The warm absorber is blueshifted by several hundred km s-1. The highest-ionisation phase of the absorber is the best constrained and has an overall equivalent Hydrogen column of order 1020 cm-2; we find that its ionisation parameter is consistent with that of the warm emitter which generates the narrow emission lines. We identify this high ionisation absorber with the low-velocity phase of the UV absorber observed by FUSE.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2003
- DOI:
- 10.1051/0004-6361:20030236
- arXiv:
- arXiv:astro-ph/0302551
- Bibcode:
- 2003A&A...403..481B
- Keywords:
-
- galaxies: active;
- galaxies: Seyfert;
- galaxies: individual: NGC 7469;
- X-rays: galaxies;
- ultraviolet: galaxies;
- techniques: spectroscopic;
- Astrophysics
- E-Print:
- 12 pages, 12 figures, accepted by A&