标题： 基于COBE/DIRBE观测的宇宙红外背景在3.5微米波段的初步探测 显示英文标题

标题： A Tentative Detection of the Cosmic Infrared Background at 3.5 microns from COBE/DIRBE Observations

摘要： 星际尘埃（IPD）颗粒的前景发射和散射光以及银河系恒星源的发射是确定~1到5微米范围内弥散天空测量的宇宙红外背景（CIB）的最大障碍。 我们结合基于地面的观测对CIB在K波段强度的限制，以及通过COBE卫星上的弥漫红外背景实验（DIRBE）获得的全天图，重新检查了CIB在1.25、3.5和4.9微米处的限制。 采用2.2微米处CIB强度为7.4 nW m⁻² sr⁻¹，并使用从IPD云发射中减去后的2.2微米DIRBE全天图，我们创建了银河系恒星对弥散红外天空贡献的空间模板。 然后利用该模板从IPD发射减去后的DIRBE全天图中扣除弥散银河系恒星发射的贡献。 DIRBE 100微米的数据用于估计星际尘埃在3.5和4.9微米处发射的小贡献。 我们的方法显著减少了与银河星光减去相关的误差，使IPD发射成分成为这些波长下探测CIB的主要障碍。 这一分析导致在3.5微米处初步检测到了CIB。 论文讨论了这些结果的宇宙学意义。 显示英文摘要

摘要： Foreground emission and scattered light from interplanetary dust (IPD) particles and emission from Galactic stellar sources are the greatest obstacles for determining the cosmic infrared background (CIB) from diffuse sky measurements in the ~ 1 to 5 micron range. We use ground-based observational limits on the K-band intensity of the CIB in conjunction with skymaps obtained by the Diffuse Infrared Background Experiment (DIRBE) on the COBE satellite to reexamine the limits on the CIB at 1.25, 3.5, and 4.9 microns. Adopting a CIB intensity of 7.4 nW m-2 sr-1 at 2.2 microns, and using the 2.2 micron DIRBE skymap from which the emission from IPD cloud has been subtracted, we create a spatial template of the Galactic stellar contribution to the diffuse infrared sky. This template is then used to subtract the contribution of the diffuse Galactic stellar emission from the IPD-emission-subtracted DIRBE skymaps. The DIRBE 100 micron data are used to estimate the small contribution of emission from interstellar dust at 3.5 and 4.9 microns. Our method significantly reduces the errors associated with the subtraction of Galactic starlight, leaving only the IPD emission component as the primary obstacle for the detection of the CIB at these wavelengths. This analysis leads to a tentative detection of the CIB at 3.5 microns. The cosmological implications of these results are discussed in the paper.