Abstract
We present here the results of a 180 ks Chandra-LETGS observation as part of a large multi-wavelength campaign on Mrk 509. We study the warm absorber in Mrk 509 and use the data from a simultaneous HST-COS observation in order to assess whether the gas responsible for the UV and X-ray absorption are the same. We analyzed the LETGS X-ray spectrum of Mrk 509 using the SPEX fitting package. We detect several absorption features originating in the ionized absorber of the source, along with resolved emission lines and radiative recombination continua. The absorption features belong to ions with, at least, three distinct ionization degrees. The lowest ionized component is slightly redshifted (v = +73 km/s) and is not in pressure equilibrium with the others, and therefore it is not likely part of the outflow, possibly belonging to the interstellar medium of the host galaxy. The other components are outflowing at velocities of -196 and -455 km/s, respectively. The source was observed simultaneously with HST-COS, finding 13 UV kinematic components. At least three of them can be kinematically associated with the observed X-ray components. Based on the HST-COS results and a previous FUSE observation, we find evidence that the UV absorbing gas might be co-located with the X-ray absorbing gas and belong to the same structure.
Highlights
Active galactic nuclei (AGN) are among the most luminous persistent extragalactic sources known in the Universe
This was found in other Seyfert 1 galaxies (e.g. Longinotti et al 2008, 2009), and is generally different from the results found in Seyfert 2 galaxies, where the lines are likely produced in the Narrow Line Region (NLR, e.g. Bianchi et al 2006; Guainazzi & Bianchi 2007)
A tentative identification of these lines suggested that they could be S xv and Si xiv, respectively. If this was the case that would mean that the gas responsible for these features is outflowing at ∼14 000 km s−1. We tested this possibility by fitting a slab model in which the outflow velocity and the ionic column densities of S xv, Si xiv, Al xiii, and Mg xii were the free parameters, while the widths of the lines were kept frozen to 100 km s−1
Summary
Active galactic nuclei (AGN) are among the most luminous persistent extragalactic sources known in the Universe. Mrk 509 is a Seyfert 1/QSO hybrid and is one of the best studied local AGN because of its high luminosity (L(1– 1000 Ryd) 3.2 × 1045 erg s−1) and proximity It is suitable for an extensive multi-wavelength campaign because of its brightness and confirmed presence of an intrinsic WA (Pounds et al 2001; Yaqoob et al 2003; Smith et al 2007; Detmers et al 2010) in X-rays, as well as a variety of UV absorption lines (Crenshaw et al 1995, 1999; Savage et al 1997; Kriss et al 2000; Kraemer et al 2003) and slow variability, which makes it suited to reverberation studies.
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