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arXiv 1708.06155astro-ph.HE
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XMM-牛顿观测到的来自NGC6217的(可能的)X射线喷流

A (likely) X-ray jet from NGC6217 observed by XMM-Newton

Serena Falocco, Josefin Larsson, Sumana Nandi

摘要:

NGC 6217是一个邻近的螺旋星系,在其中心附近有一个星暴区。在光谱中也发现了低光度活动星系核(AGN)的证据。有趣的是,ROSAT的X射线观测揭示了三个与星系中心对齐的结,类似于喷流结构。本文介绍了XMM-牛顿观测的研究,以评估从NGC 6217中心发射的射流的假设。XMM数据证实了ROSAT发现的结,我们的光谱分析表明,它们具有类似的光谱特性,硬光子指数Gamma~1.7。NGC 6217的核心是很好地拟合的模型与AGN和星暴组件,其中AGN的贡献最多为46%的总流量。候选喷流的视长度约为15 kpc,光度约为5 × 10^38 erg/s。它的突出之处在于它是一个旋涡星系,因为喷流更广泛地与椭圆星系联系在一起。为了解释喷气发射机制,我们考虑假设的平流占主导地位的吸积流与低吸积率。从NGC 6217发射的候选喷流是有趣的,因为它代表了对活动星系核,喷流和宿主星系之间联系的现有知识的挑战。

英文摘要:

NGC6217 is a nearby spiral galaxy with a starburst region near its center. 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 center, resembling a jet structure. This paper presents a study of XMM-Newton observations made to assess the hypothesis of a jet emitted from the center 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~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% of the total flux. The candidate jet has an apparent length ~15 kpc and a luminosity of ~5 X 10^38 erg/s. 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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