Spine–sheath layer radiative interplay in subparsec‐scale jets and the TeV emission from M87

By F. Tavecchio, G. Ghisellini. 2008

146 citations recorded by the source corpus.

Simple one-zone homogeneous synchrotron self-Compton models have severe difficulties in explaining the TeV emission observed in the radio galaxy M87. Also, the site the TeV emission region is uncertain: it could be the unresolved jet close to the nucleus, analogously to what is proposed for blazars, or it could be the active knot, called HST-1, tens of parsec away. We explore the possibility that the TeV emission of M87 is produced in the misaligned subparsec-scale jet. We base our modelling on a structured jet, with a fast spine surrounded by a slower layer. In this context the main site responsible for the emission of the TeV radiation is the layer, while the (debeamed) spine accounts for the emission from the radio to the GeV band: therefore we expect a more complex correlation with the TeV component than that expected in one-zone scenarios, in which both components are produced by the same region. Observed from small angles, the spine would dominate the emission, with an overall spectral energy distribution close to those of BL Lac objects with a synchrotron peak located at low energy.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/09b85cb46426a9daeea320b4ce73264c3e08b2be

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In Nuclear and High Energy Physics

1. F. Tavecchio
2. G. Ghisellini
3. L. Maraschi
4. C. Dermer
5. D. Harris
6. Luigi Foschini
7. G. Ghirlanda
8. J. Finke

Citations in the corpus

• Rapid variability in TeV blazars: the case of PKS 2155—304 (2008, methodology): “The corresponding transformations are fully described in G05 and Tavecchio & Ghisellini (2008).”
• TeV BL Lac objects at the dawn of the Fermi era (2009, background): “In these conditions, the SSC model requires a rather large Doppler factor, δ > 50, and a low magnetic field (see Tavecchio & Ghisellini 2008 for a discussion).”
• Synchrotron Self-Compton Analysis of TeV X-Ray-Selected BL Lacertae Objects (2008, background): “These photons could originate from a slower-moving sheath surrounding a faster jet spine (Ghisellini et al. 2005; Tavecchio & Ghisellini 2008), or from an advanced portion of the jet moving at a slower speed (Georganopoulos & Kazanas 2003).”
• FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87 (2009, methodology): “Such models (Georganopoulos et al. 2005; Tavecchio & Ghisellini 2008) have in fact been used to fit the SED of M87 in addition to models based on additional spatial structure (e.g., Lenain et al. 2007).”
• LEPTONIC AND HADRONIC MODELING OF FERMI-DETECTED BLAZARS (2013, methodology): “In order to remedy some of the problems, several variations of multi-zone models have been proposed, including the spine-sheath model of Tavecchio & Ghisellini (2008) or the decelerating jet model of Georganopoulos & Kazanas (2003), as well as internal shock models (e.g., Marscher & Gear 1985;…”