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

Driver, S P, Robotham, A S G, Kelvin, L, Alpaslan, M, Baldry, I K, Bamford, S P, Brough, S, Brown, M, Hopkins, A M, Liske, J, Loveday, J, Norberg, P, Peacock, J A, Andrae, E, Bland-Hawthorn, J, Bourne, N, Cameron, E, Colless, M, Conselice, C J, Croom, S M, Dunne, L, Frenk, C S, Graham, A W, Gunawardhana, M, Hill, D T, Jones, D H, Kuijken, K, Madore, B, Nichol, R C, Parkinson, H R, Pimbblet, K A, Phillipps, S, Popescu, C C, Prescott, M, Seibert, M, Sharp, R G, Sutherland, W J, Taylor, E N, Thomas, D, Tuffs, R J, van Kampen, E, Wijesinghe, D and Wilkins, S (2012) Galaxy And Mass Assembly (GAMA): the 0.013 < z < 0.1 cosmic spectral energy distribution from 0.1 m to 1 mm. Monthly Notices of the Royal Astronomical Society, 427 (4). pp. 3244-3264. ISSN 0035-8711

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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 × 105 (Mpc h−1)3. 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) × 1035 h W Mpc−3 of which (1.2 ± 0.1) × 1035 h W Mpc−3 is directly released into the inter-galactic medium and (0.6 ± 0.1) × 1035 h W Mpc−3 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 0.1 μm 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: Stephen Wilkins
Date Deposited: 26 Apr 2013 09:56
Last Modified: 07 Mar 2017 07:17

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