A 1D fluid model of the Centaurus A jet
Links to Fileshttps://arxiv.org/abs/1812.04587
MetadataShow full item record
Type of Work20 pages
journal articles preprints
Citation of Original PublicationSarka Wykes, Bradford T. Snios, Paul E. J. Nulsen, Ralph P. Kraft, Mark Birkinshaw, Martin J. Hardcastle, Diana M. Worrall, Iain McDonald, Marina Rejkuba, Thomas W. Jones, David J. Stark, William R. Forman, Eileen T. Meyer, Christine Jones, A 1D fluid model of the Centaurus A jet, Astrophysics , Astrophysics of Galaxies, 2019, https://arxiv.org/abs/1812.04587
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low mass - galaxies
active - galaxies
centaurus A - galaxies
jets - X-rays
We implement a steady, one-dimensional flow model for the X-ray jet of Centaurus A in which entrainment of stellar mass loss is the primary cause of dissipation. Using over 260 ks of new and archival Chandra/ACIS data, we have constrained the temperature, density and pressure distributions of gas in the central regions of the host galaxy of Centaurus A, and so the pressure throughout the length of its jet. The model is constrained by the observed profiles of pressure and jet width, and conserves matter and energy, enabling us to estimate jet velocities, and hence all the other flow properties. Invoking realistic stellar populations within the jet, we find that the increase in its momentum flux exceeds the net pressure force on the jet unless only about one half of the total stellar mass loss is entrained. For self-consistent models, the bulk speed only falls modestly, from ~0.67c to ~0.52c over the range of 0.25-5.94 kpc from the nucleus. The sonic Mach number varies between ~5.3 and 3.6 over this range.