Abstract
We present in this paper the results of a 270 ks Chandra HETGS observation in the context of a large multiwavelength campaign on the Seyfert galaxy Mrk 509. The HETGS spectrum allows us to study the high ionisation warm absorber and the Fe-K complex in Mrk 509. We search for variability in the spectral properties of the source with respect to previous observations in this campaign, as well as for evidence of ultra-fast outflow signatures. The Chandra HETGS X-ray spectrum of Mrk 509 was analysed using the SPEX fitting package. We confirm the basic structure of the warm absorber found in the 600 ks XMM-Newton RGS observation observed three years earlier, consisting of five distinct ionisation components in a multikinematic regime. We find little or no variability in the physical properties of the different warm absorber phases with respect to previous observations in this campaign, except for component D2 which has a higher column density at the expense of component C2 at the same outflow velocity (-240 km/s). Contrary to prior reports we find no -700 km/s outflow component. The O VIII absorption line profiles show an average covering factor of 0.81 +/- 0.08 for outflow velocities faster than -100 km/s, similar to those measured in the UV. This supports the idea of a patchy wind. The relative metal abundances in the outflow are close to proto-solar. The narrow component of the Fe Kalpha emission line shows no changes with respect to previous observations which confirms its origin in distant matter. The narrow line has a red wing that can be interpreted to be a weak relativistic emission line. We find no significant evidence of ultra-fast outflows in our new spectrum down to the sensitivity limit of our data.
Highlights
Active galactic nuclei (AGN) are powered by gravitational accretion of matter onto a central supermassive black hole
From our individual line analysis, we find that the line centroid of the lines from the ions that are dominated by ionisation component D in the notation of Detmers et al (2011) (Si xiv, Si xiii, Mg xii and Ne x) have a weighted average outflow velocity of −227 ± 24 km s−1, consistent with the velocity of UV trough T3
In this paper we report a Chandra HETGS observation of Mrk 509 taken in September 2012
Summary
J. S. Kaastra1,2,3, J. Ebrero4,1, N. Arav5, E. Behar6, S. Bianchi7, G. Branduardi-Raymont8 , M. Cappi9, E. Costantini1, G. A. Kriss10,11, B. De Marco12, M. Mehdipour8,1, S. Paltani13, P.-O. Petrucci14,15, C. Pinto16, G. Ponti12, K. C. Steenbrugge17,18, and C. P. de Vries1
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