Galaxy And Mass Assembly (GAMA): the 0.013 < z < 0.1 cosmic spectral energy distribution from 0.1 μm to 1 mm

S.P. Driver, A.S.G. Robotham, L. Kelvin, M. Alpaslan, I.K. Baldry, S.P. Bamford, S. Brough, M. Brown, A.M. Hopkins, J. Liske, J. Loveday, P. Norberg, J.A. Peacock, E. Andrae, J. Bland-Hawthorn, N. Bourne, E. Cameron, M. Colless, C.J. Conselice, S.M. CroomL. Dunne, C.S. Frenk, A.W. Graham, M. Gunawardhana, D.T. Hill, D.H. Jones, K. Kuijken, B. Madore, R.C. Nichol, H.R. Parkinson, K.A. Pimbblet, S. Phillipps, C.C. Popescu, M. Prescott, M. Seibert, R.G. Sharp, W.J. Sutherland, E.N. Taylor, D. Thomas, R.J. Tuffs, E. van Kampen, D. Wijesinghe, S. Wilkins

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We use the Galaxy And Mass Assembly survey (GAMA) I data set combined with GALEX, Sloan Digital Sky Survey (SDSS) and UKIRT Infrared Deep Sky Survey (UKIDSS) imaging to construct the low-redshift (z <0.1) galaxy luminosity functions in FUV, NUV, ugriz and YJHK bands from within a single well-constrained volume of 3.4 × 10 (Mpc h). The derived luminosity distributions are normalized to the SDSS data release 7 (DR7) main survey to reduce the estimated cosmic variance to the 5 per cent level. The data are used to construct the cosmic spectral energy distribution (CSED) from 0.1 to 2.1 μm free from any wavelength-dependent cosmic variance for both the elliptical and non-elliptical populations. The two populations exhibit dramatically different CSEDs as expected for a predominantly old and young population, respectively. Using the Driver et al. prescription for the azimuthally averaged photon escape fraction, the non-ellipticals are corrected for the impact of dust attenuation and the combined CSED constructed. The final results show that the Universe is currently generating (1.8 ± 0.3) × 10h W Mpc of which (1.2 ± 0.1) × 10h W Mpc is directly released into the inter-galactic medium and (0.6 ± 0.1) × 10h W Mpc is reprocessed and reradiated by dust in the far-IR. Using the GAMA data and our dust model we predict the mid- and far-IR emission which agrees remarkably well with available data. We therefore provide a robust description of the pre- and post-dust attenuated energy output of the nearby Universe from 0.1μm to 0.6 mm. The largest uncertainty in this measurement lies in the mid- and far-IR bands stemming from the dust attenuation correction and its currently poorly constrained dependence on environment, stellar mass and morphology.
Original languageEnglish
Pages (from-to)3244-3264
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date20 Dec 2012
Publication statusPublished - 21 Dec 2012


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