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|Title:||A new powerful and highly variable disc wind in an AGN-star-forming galaxy, the case of MCG-03-58-007||Authors:||BRAITO, Valentina
Reeves, J. N.
Matzeu, G. A.
DELLA CECA, Roberto
Turner, T. J.
|Issue Date:||2018||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||479||Issue:||3||First Page:||3592||Abstract:||We present the discovery of a new candidate for a fast disc wind, in the nearby Seyfert 2 galaxy MCG-03-58-007. This wind is discovered in a deep Suzaku observation that was performed in 2010. Overall the X-ray spectrum of MCG-03-58-007 is highly absorbed by a neutral column density of N<SUB>H</SUB> ∼10<SUP>23</SUP> cm<SUP>-2</SUP>, in agreement with the optical classification as a type 2 active galactic nucleus. In addition, this observation unveiled the presence of two deep absorption troughs at E = 7.4 ± 0.1 and 8.5 ± 0.2 keV. If associated with blueshifted Fe XXVI, these features can be explained with the presence of two highly ionized (log ξ/erg cm s<SUP>-1</SUP> ∼5.5) and high column density (N<SUB>H</SUB> ∼ 5-8 × 10<SUP>23</SUP> cm<SUP>-2</SUP>) outflowing absorbers with v<SUB>out1</SUB> ∼ -0.1c and v<SUB>out2</SUB> ∼ -0.2c. The disc wind detected during this observation is most likely launched from within a few hundreds gravitational radii from the central black and has a kinetic output that matches the prescription for significant feedback. The presence of the lower velocity component of the disc wind is independently confirmed by the analysis of a follow-up XMM-Newton and NuSTAR observation. A faster (v<SUB>out</SUB> ∼ -0.35c) component of the wind is also seen in this second observation. During this observation we also witnessed an occultation event lasting ∆t ∼ 120 ks, which we ascribe to an increase of the opacity of the disc wind (∆N<SUB>H</SUB> ∼ 1.4 × 10<SUP>24</SUP> cm<SUP>-2</SUP>). Our interpretation is that the slow zone (v<SUB>out</SUB> ∼ -0.1c) of the wind is the most stable but inhomogeneous component, while the faster zones could be associated with two different inner streamlines of the wind.||URI:||http://hdl.handle.net/20.500.12386/28401||URL:||https://academic.oup.com/mnras/article-abstract/479/3/3592/5046490||ISSN:||0035-8711||DOI:||10.1093/mnras/sty1697||Bibcode ADS:||2018MNRAS.479.3592B||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jan 19, 2021
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