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CHANG-ES. XXX. 10 kpc Radio Lobes in The Sombrero Galaxy

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arxiv 2403.16682 v1 pith:GA5WRIPO submitted 2024-03-25 astro-ph.GA

Yang Yang , Jiang-Tao Li , Theresa Wiegert , Zhiyuan Li , Fulai Guo , Judith Irwin , Q. Daniel Wang , Ralf-Juergen Dettmar
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Rainer Beck Jayanne English Li Ji
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keywords lobespressuregalaxyambientbalancechang-esexaminefurther
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abstract

We report the discovery of the 10 kilo-parsec (kpc) scale radio lobes in the Sombrero galaxy (NGC 4594), using data from the Continuum Halos in Nearby Galaxies - an Expanded Very Large Array (VLA) Survey (CHANG-ES) project. We further examine the balance between the magnetic pressure inside the lobes and the thermal pressure of the ambient hot gas. At the radii $r$ of ~(1-10) kpc, the magnetic pressure inside the lobes and the thermal pressure of the ambient hot gas are generally in balance. This implies that the jets could expand into the surroundings at least to r ~ 10 kpc. The feedback from the active galactic nucleus (AGN) jet responsible for the large-scale lobes may help to explain the unusually high X-ray luminosity of this massive quiescent isolated disk galaxy, although more theoretical work is needed to further examine this possibility.

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  1. Evidence for the Sombrero Galaxy as an Accelerator of the Highest-Energy Cosmic Rays

    astro-ph.HE 2024-12 conditional novelty 6.0 of 10

    A maximum-likelihood search of Pierre Auger data finds a 3.3 sigma (global) association between a cosmic-ray multiplet and the Sombrero Galaxy, supporting AGN jet and lobe acceleration of UHECRs.

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