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Optical colours and spectral indices of z = 0.1 EAGLE galaxies with the 3D dust radiative transfer code SKIRT

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Abstract
We present mock optical images, broad-band and H alpha fluxes, and D4000 spectral indices for 30 145 galaxies from the EAGLE hydrodynamical simulation at redshift z = 0.1, modelling dust with the SKIRT Monte Carlo radiative transfer code. The modelling includes a subgrid prescription for dusty star-forming regions, with both the subgrid obscuration of these regions and the fraction of metals in diffuse interstellar dust calibrated against far-infrared fluxes of local galaxies. The predicted optical colours as a function of stellar mass agree well with observation, with the SKIRT model showing marked improvement over a simple dust-screen model. The orientation dependence of attenuation is weaker than observed because EAGLE galaxies are generally puffier than real galaxies, due to the pressure floor imposed on the interstellar medium (ISM). The mock Ha luminosity function agrees reasonably well with the data, and we quantify the extent to which dust obscuration affects observed H alpha fluxes. The distribution of D4000 break values is bimodal, as observed. In the simulation, 20 per cent of galaxies deemed 'passive' for the SKIRT model, i.e. exhibiting D4000 > 1.8, are classified 'active' when ISM dust attenuation is not included. The fraction of galaxies with stellar mass greater than 10(10) M-circle dot that are deemed passive is slightly smaller than observed, which is due to low levels of residual star formation in these simulated galaxies. Colour images, fluxes and spectra of EAGLE galaxies are to be made available through the public EAGLE data base.
Keywords
dust, extinction, galaxies: star formation, DIGITAL SKY SURVEY, STAR-FORMING GALAXIES, STELLAR POPULATION SYNTHESIS, INITIAL MASS FUNCTION, ACTIVE GALACTIC NUCLEI, EMISSION-LINE SPECTRA, LOW-REDSHIFT UNIVERSE, COLD DARK-MATTER, TO-METAL RATIOS, SPIRAL GALAXIES

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Chicago
Trayford, James W, Peter Camps, Tom Theuns, Maarten Baes, Richard G Bower, Robert A Crain, Madusha LP Gunawardhana, Matthieu Schaller, Joop Schaye, and Carlos S Frenk. 2017. “Optical Colours and Spectral Indices of z = 0.1 EAGLE Galaxies with the 3D Dust Radiative Transfer Code SKIRT.” Monthly Notices of the Royal Astronomical Society 470 (1): 771–799.
APA
Trayford, J. W., Camps, P., Theuns, T., Baes, M., Bower, R. G., Crain, R. A., Gunawardhana, M. L., et al. (2017). Optical colours and spectral indices of z = 0.1 EAGLE galaxies with the 3D dust radiative transfer code SKIRT. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 470(1), 771–799.
Vancouver
1.
Trayford JW, Camps P, Theuns T, Baes M, Bower RG, Crain RA, et al. Optical colours and spectral indices of z = 0.1 EAGLE galaxies with the 3D dust radiative transfer code SKIRT. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2017;470(1):771–99.
MLA
Trayford, James W, Peter Camps, Tom Theuns, et al. “Optical Colours and Spectral Indices of z = 0.1 EAGLE Galaxies with the 3D Dust Radiative Transfer Code SKIRT.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470.1 (2017): 771–799. Print.
@article{8538455,
  abstract     = {We present mock optical images, broad-band and H alpha fluxes, and D4000 spectral indices for 30 145 galaxies from the EAGLE hydrodynamical simulation at redshift z = 0.1, modelling dust with the SKIRT Monte Carlo radiative transfer code. The modelling includes a subgrid prescription for dusty star-forming regions, with both the subgrid obscuration of these regions and the fraction of metals in diffuse interstellar dust calibrated against far-infrared fluxes of local galaxies. The predicted optical colours as a function of stellar mass agree well with observation, with the SKIRT model showing marked improvement over a simple dust-screen model. The orientation dependence of attenuation is weaker than observed because EAGLE galaxies are generally puffier than real galaxies, due to the pressure floor imposed on the interstellar medium (ISM). The mock Ha luminosity function agrees reasonably well with the data, and we quantify the extent to which dust obscuration affects observed H alpha fluxes. The distribution of D4000 break values is bimodal, as observed. In the simulation, 20 per cent of galaxies deemed 'passive' for the SKIRT model, i.e. exhibiting D4000 {\textrangle} 1.8, are classified 'active' when ISM dust attenuation is not included. The fraction of galaxies with stellar mass greater than 10(10) M-circle dot that are deemed passive is slightly smaller than observed, which is due to low levels of residual star formation in these simulated galaxies. Colour images, fluxes and spectra of EAGLE galaxies are to be made available through the public EAGLE data base.},
  author       = {Trayford, James W and Camps, Peter and Theuns, Tom and Baes, Maarten and Bower, Richard G and Crain, Robert A and Gunawardhana, Madusha LP and Schaller, Matthieu and Schaye, Joop and Frenk, Carlos S},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keyword      = {dust,extinction,galaxies: star formation,DIGITAL SKY SURVEY,STAR-FORMING GALAXIES,STELLAR POPULATION SYNTHESIS,INITIAL MASS FUNCTION,ACTIVE GALACTIC NUCLEI,EMISSION-LINE SPECTRA,LOW-REDSHIFT UNIVERSE,COLD DARK-MATTER,TO-METAL RATIOS,SPIRAL GALAXIES},
  language     = {eng},
  number       = {1},
  pages        = {771--799},
  title        = {Optical colours and spectral indices of z~=~0.1 EAGLE galaxies with the 3D dust radiative transfer code SKIRT},
  url          = {http://dx.doi.org/10.1093/mnras/stx1051},
  volume       = {470},
  year         = {2017},
}

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