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

James W Trayford, Peter Camps UGent, Tom Theuns, Maarten Baes UGent, Richard G Bower, Robert A Crain, Madusha LP Gunawardhana, Matthieu Schaller, Joop Schaye and Carlos S Frenk (2017) MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 470(1). p.771-799
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
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
journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Mon. Not. Roy. Astron. Soc.
volume
470
issue
1
pages
771 - 799
Web of Science type
Article
Web of Science id
000406842600048
ISSN
0035-8711
1365-2966
DOI
10.1093/mnras/stx1051
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8538455
handle
http://hdl.handle.net/1854/LU-8538455
date created
2017-11-22 08:37:11
date last changed
2017-12-15 15:12:47
@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},
}

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.