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A (likely) X-ray jet from NGC6217 observed by XMM-Newton
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 472, no 2, p. 2280-2288Article in journal (Refereed) Published
Abstract [en]

NGC6217 is a nearby spiral galaxy with a starburst region near its centre. Evidence for a low-luminosity Active Galactic Nucleus (AGN) in its core has also been found in optical spectra. Intriguingly, X-ray observations by ROSAT revealed three knots aligned with the galaxy centre, resembling a jet structure. This paper presents a study of XMM-Newton observations made to assess the hypothesis of a jet emitted from the centre of NGC6217. The XMM data confirm the knots found with ROSAT and our spectral analysis shows that they have similar spectral properties with a hard photon index Gamma similar to 1.7. The core of NGC6217 is well fitted by a model with an AGN and a starburst component, where the AGN contributes at most 46 per cent of the total flux. The candidate jet has an apparent length similar to 15 kpc and a luminosity of similar to 5 x 10(38) erg s(-1). It stands out by being hosted by a spiral galaxy, since jets are more widely associated with ellipticals. To explain the jet launching mechanism we consider the hypothesis of an advection dominated accretion flow with a low accretion rate. The candidate jet emitted from NGC6217 is intriguing since it represents a challenge to the current knowledge of the connection between AGN, jets and host galaxies.

Place, publisher, year, edition, pages
Oxford University Press, 2017. Vol. 472, no 2, p. 2280-2288
Keywords [en]
galaxies: jets, galaxies: nuclei, galaxies: spiral
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-217168DOI: 10.1093/mnras/stx2168ISI: 000413082900076Scopus ID: 2-s2.0-85052538221OAI: oai:DiVA.org:kth-217168DiVA, id: diva2:1155017
Funder
Wenner-Gren FoundationsSwedish National Space BoardKnut and Alice Wallenberg Foundation
Note

QC 20171106

Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2018-10-16Bibliographically approved

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