Galaxy formation with local photoionization feedback - I. methods

R. Kannan, G. S. Stinson, Andrea Maccio, J. F. Hennawi, R. Woods, J. Wadsley, S. Shen, T. Robitaille, S. Cantalupo, T. R. Quinn, C. Christensen

Research output: Contribution to journalArticle

Abstract

We present a first study of the effect of local photoionizing radiation on gas cooling in smoothed particle hydrodynamics simulations of galaxy formation. We explore the combined effect of ionizing radiation from young and old stellar populations. The method computes the effect of multiple radiative sources using the same tree algorithm as used for gravity, so it is computationally efficient and well resolved. The method foregoes calculating absorption and scattering in favour of a constant escape fraction for young stars to keep the calculation efficient enough to simulate the entire evolution of a galaxy in a cosmological context to the present day. This allows us to quantify the effect of the local photoionization feedback through the whole history of a galaxy's formation. The simulation of a MilkyWay-like galaxy using the local photoionization model forms ~40 per cent less stars than a simulation that only includes a standard uniform background UV field. The local photoionization model decreases star formation by increasing the cooling time of the gas in the halo and increasing the equilibrium temperature of dense gas in the disc. Coupling the local radiation field to gas cooling from the halo provides a preventive feedback mechanism which keeps the central disc light and produces slowly rising rotation curves without resorting to extreme feedback mechanisms. These preliminary results indicate that the effect of local photoionizing sources is significant and should not be ignored in models of galaxy formation.

Original languageEnglish (US)
Pages (from-to)2882-2893
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume437
Issue number3
DOIs
StatePublished - Jan 1 2014

Fingerprint

galactic evolution
photoionization
gas cooling
feedback mechanism
cooling
gas
halos
galaxies
simulation
stars
gases
ionizing radiation
radiation distribution
escape
star formation
hydrodynamics
scattering
method
effect
histories

Keywords

  • Atomic processes - hydrodynamics - plasmas - radiative transfer - methods
  • Formation
  • Numerical - galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kannan, R., Stinson, G. S., Maccio, A., Hennawi, J. F., Woods, R., Wadsley, J., ... Christensen, C. (2014). Galaxy formation with local photoionization feedback - I. methods. Monthly Notices of the Royal Astronomical Society, 437(3), 2882-2893. https://doi.org/10.1093/mnras/stt2098

Galaxy formation with local photoionization feedback - I. methods. / Kannan, R.; Stinson, G. S.; Maccio, Andrea; Hennawi, J. F.; Woods, R.; Wadsley, J.; Shen, S.; Robitaille, T.; Cantalupo, S.; Quinn, T. R.; Christensen, C.

In: Monthly Notices of the Royal Astronomical Society, Vol. 437, No. 3, 01.01.2014, p. 2882-2893.

Research output: Contribution to journalArticle

Kannan, R, Stinson, GS, Maccio, A, Hennawi, JF, Woods, R, Wadsley, J, Shen, S, Robitaille, T, Cantalupo, S, Quinn, TR & Christensen, C 2014, 'Galaxy formation with local photoionization feedback - I. methods', Monthly Notices of the Royal Astronomical Society, vol. 437, no. 3, pp. 2882-2893. https://doi.org/10.1093/mnras/stt2098
Kannan, R. ; Stinson, G. S. ; Maccio, Andrea ; Hennawi, J. F. ; Woods, R. ; Wadsley, J. ; Shen, S. ; Robitaille, T. ; Cantalupo, S. ; Quinn, T. R. ; Christensen, C. / Galaxy formation with local photoionization feedback - I. methods. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 437, No. 3. pp. 2882-2893.
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