arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.0259astro-ph.CO
收藏

星系和质量集合体(GAMA):0.013 < z < 0.1宇宙光谱能量分布从0.1微米到1毫米

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

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… 展开作者

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. Croom, L. Dunne, C. S. Frenk, Alister 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

摘要:

我们使用GAMA I数据集,结合GALEX、SDSS和UKIDSS成像,在3.4 x 10^5(Mpc/h)的单井约束体积^{3}内,构建了FUV、NUV、ugriz和YJHK波段的低红移(z<0.1)星系光度函数。导出的光度分布归一化到SDSS DR 7主调查,以减少估计的宇宙方差到5%的水平。这些数据被用来构建宇宙光谱能量分布(CSED)从0.1到2.1 \mum从任何波长依赖的宇宙方差的椭圆和非椭圆人口。这两个人群表现出显着不同的CSED,如预期的主要是老年人和年轻人的人口分别。使用Driver等人(2008)对方位角平均光子逃逸分数的处方,针对尘埃衰减的影响校正非椭圆,并构建组合CSED。最终结果显示,宇宙目前正在产生(1.8 +/- 0.3)x 10^{35} h W Mpc^{-3},其中(1.2 +/- 0.1)x 10^{35} h W Mpc^{-3}直接释放到星系间介质中,(0.6 +/- 0.1)× 10^{35} h W Mpc^{-3}在远红外区被尘埃再加工和再辐射,利用GAMA数据和我们的尘埃模型,我们预测了中、远红外辐射,与现有数据吻合得非常好。因此,我们提供了一个强大的描述前和后尘埃衰减的能量输出附近的宇宙从0.1微米到0.6毫米。在这种测量中最大的不确定性在于中红外和远红外波段的尘埃衰减校正,其目前约束环境,恒星质量和形态的依赖性差。

英文摘要:

We use the GAMA I dataset combined with GALEX, SDSS and 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 x 10^5 (Mpc/h)^{3}. The derived luminosity distributions are normalised to the SDSS 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 \mum 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. (2008) 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) x 10^{35} h W Mpc^{-3} of which (1.2 +/- 0.1) x 10^{35} h W Mpc^{-3} is directly released into the inter-galactic medium and (0.6 +/- 0.1) x 10^{35} 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 0.1micron to 0.6mm. 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑