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Accretion and jets in a low-luminosity AGN : the nucleus of NGC 1052
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- Falocco, Serena (author)
- KTH,Partikel- och astropartikelfysik
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- Larsson, Josefin (author)
- KTH,Partikel- och astropartikelfysik
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- Nandi, S. (author)
- TIFR, Natl Ctr Radio Astrophys, Pune Univ Campus,Post Bag 3, Pune 411007, Maharashtra, India.
- (creator_code:org_t)
- 2020-06-12
- 2020
- English.
- In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 638
- Journal article (peer-reviewed)
Abstract
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- Aims.We aim to determine the properties of the central region of NGC 1052 using X-ray and radio data. NGC 1052 (z & x2004;=& x2004;0.005) has been investigated for decades in different energy bands and shows radio lobes and a low-luminosity active galactic nucleus. Methods.We used X-ray images fromChandraand radio images from Very Large Array to explore the morphology of the central area. We also studied the spectra of the nucleus and the surrounding region using observations fromChandraandXMM-Newton. Results.We find diffuse soft X-ray radiation and hot-spots along the radio lobes. The spectrum of the circum-nuclear region is well described by a thermal plasma (T & x2004;similar to & x2004;0.6 keV) and a power law with photon index Gamma & x2004;similar to & x2004;2.3. The nucleus shows a hard power law (Gamma & x2004;similar to & x2004;1.4) modified by complex absorption. A narrow iron K alpha line is also clearly detected in all observations, but there is no evidence for relativistic reflection. Conclusions.The extended emission is consistent with originating from extended jets and from jet-triggered shocks in the surrounding medium. The hard power-law emission from the nucleus and the lack of relativistic reflection supports the scenario of inefficient accretion in an advection-dominated accretion flow.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- X-rays
- galaxies
- nuclei
- jets
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- ref (subject category)
- art (subject category)
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