Extragalactic background light inferred from AEGIS galaxy-SED-type fractions

被引:613
作者
Dominguez, A. [1 ,2 ]
Primack, J. R. [3 ]
Rosario, D. J. [4 ]
Prada, F. [2 ]
Gilmore, R. C. [3 ,5 ]
Faber, S. M. [4 ]
Koo, D. C. [4 ]
Somerville, R. S. [6 ]
Perez-Torres, M. A. [2 ]
Perez-Gonzalez, P. [7 ]
Huang, J. -S. [8 ]
Davis, M. [9 ]
Guhathakurta, P. [4 ]
Barmby, P. [10 ]
Conselice, C. J. [11 ]
Lozano, M. [1 ]
Newman, J. A. [12 ]
Cooper, M. C. [13 ]
机构
[1] Univ Seville, Dept Fis Atom Mol & Nucl, E-41080 Seville, Spain
[2] CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain
[3] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA
[4] Univ Calif Santa Cruz, Dept Astron & Astrophys, UCO Lick Observ, Santa Cruz, CA 95064 USA
[5] SISSA, I-34136 Trieste, Italy
[6] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[7] Univ Complutense Madrid, Fac CC Fis, Dept Astrofis, E-28040 Madrid, Spain
[8] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[9] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[10] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada
[11] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England
[12] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA
[13] Univ Arizona, Steward Observ, Tucson, AZ USA
基金
美国国家科学基金会;
关键词
galaxies: evolution; galaxies: formation; cosmology: observations; diffuse radiation; infrared: diffuse background; ACTIVE GALACTIC NUCLEI; STAR-FORMATION RATES; SPECTRAL ENERGY-DISTRIBUTIONS; OPTICAL LUMINOSITY FUNCTIONS; SUPERMASSIVE BLACK-HOLES; MICRON SOURCE COUNTS; GAMMA-RAY EMISSION; FORS DEEP FIELD; HIGH-REDSHIFT; NUMBER COUNTS;
D O I
10.1111/j.1365-2966.2010.17631.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The extragalactic background light (EBL) is of fundamental importance both for understanding the entire process of galaxy evolution and for gamma-ray astronomy, but the overall spectrum of the EBL between 0.1 and 1000 mu m has never been determined directly from galaxy spectral energy distribution (SED) observations over a wide redshift range. The evolving, overall spectrum of the EBL is derived here utilizing a novel method based on observations only. This is achieved from the observed evolution of the rest-frame K-band galaxy luminosity function up to redshift 4, combined with a determination of galaxy-SED-type fractions. These are based on fitting Spitzer Wide-Area Infrared Extragalactic Survey (SWIRE) templates to a multiwavelength sample of about 6000 galaxies in the redshift range from 0.2 to 1 from the All-wavelength Extended Groth Strip International Survey (AEGIS). The changing fractions of quiescent galaxies, star-forming galaxies, starburst galaxies and active galactic nucleus (AGN) galaxies in that redshift range are estimated, and two alternative extrapolations of SED types to higher redshifts are considered. This allows calculation of the evolution of the luminosity densities from the ultraviolet (UV) to the infrared (IR), the evolving star formation rate density of the Universe, the evolving contribution to the bolometric EBL from the different galaxy populations including AGN galaxies and the buildup of the EBL. Our EBL calculations are compared with those from a semi-analytic model, another observationally based model and observational data. The EBL uncertainties in our modelling based directly on the data are quantified, and their consequences for attenuation of very-high-energy gamma-rays due to pair production on the EBL are discussed. It is concluded that the EBL is well constrained from the UV to the mid-IR, but independent efforts from IR and gamma-ray astronomy are needed in order to reduce the uncertainties in the far-IR.
引用
收藏
页码:2556 / 2578
页数:23
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