A 1D fluid model of the Centaurus A jet

Sarka 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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)872-888
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume485
Issue number1
DOIs
StatePublished - May 1 2019

Fingerprint

fluid
fluids
stellar mass
one dimensional flow
entrainment
pressure distribution
Mach number
density distribution
dissipation
momentum
temperature distribution
galaxies
nuclei
causes
estimates
profiles
gases
gas
energy
x rays

Keywords

  • X-rays: galaxies
  • galaxies: active
  • galaxies: individual: Centaurus A
  • galaxies: jets
  • stars: low mass

Cite this

Wykes, S., Snios, B. T., Nulsen, P. E. J., Kraft, R. P., Birkinshaw, M., Hardcastle, M. J., ... Jones, C. (2019). A 1D fluid model of the Centaurus A jet. Monthly Notices of the Royal Astronomical Society, 485(1), 872-888. https://doi.org/10.1093/mnras/stz348

A 1D fluid model of the Centaurus A jet. / Wykes, Sarka; Snios, Bradford T.; Nulsen, Paul E.J.; Kraft, Ralph P.; Birkinshaw, Mark; Hardcastle, Martin J.; Worrall, Diana M.; McDonald, Iain; Rejkuba, Marina; Jones, Thomas W.; Stark, David J.; Forman, William R.; Meyer, Eileen T.; Jones, Christine.

In: Monthly Notices of the Royal Astronomical Society, Vol. 485, No. 1, 01.05.2019, p. 872-888.

Research output: Contribution to journalArticle

Wykes, S, Snios, BT, Nulsen, PEJ, Kraft, RP, Birkinshaw, M, Hardcastle, MJ, Worrall, DM, McDonald, I, Rejkuba, M, Jones, TW, Stark, DJ, Forman, WR, Meyer, ET & Jones, C 2019, 'A 1D fluid model of the Centaurus A jet', Monthly Notices of the Royal Astronomical Society, vol. 485, no. 1, pp. 872-888. https://doi.org/10.1093/mnras/stz348
Wykes S, Snios BT, Nulsen PEJ, Kraft RP, Birkinshaw M, Hardcastle MJ et al. A 1D fluid model of the Centaurus A jet. Monthly Notices of the Royal Astronomical Society. 2019 May 1;485(1):872-888. https://doi.org/10.1093/mnras/stz348
Wykes, Sarka ; Snios, Bradford T. ; Nulsen, Paul E.J. ; Kraft, Ralph P. ; Birkinshaw, Mark ; Hardcastle, Martin J. ; Worrall, Diana M. ; McDonald, Iain ; Rejkuba, Marina ; Jones, Thomas W. ; Stark, David J. ; Forman, William R. ; Meyer, Eileen T. ; Jones, Christine. / A 1D fluid model of the Centaurus A jet. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 485, No. 1. pp. 872-888.
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