从FDF光谱巡天、K20巡天和GDDS中选取了108个1 < z < 2.5的大质量恒星形成星系，研究了消光曲线的基本性质，如静止坐标系紫外线（UV）的斜率和是否存在以2175 A为中心的宽吸收过剩（UV凸起）。这些特性的约束从一个星系的紫外光谱能量分布（SED）的参数描述，强制执行的组合恒星星族和辐射转移模型为不同的几何形状，尘埃/恒星配置和尘埃属性。在至少三分之一的样品中，存在消光曲线的有力证据，至少具有中度UV凸起。在具有严重变红的紫外线SEDs的星系中，紫外线凸起的载体的存在更为明显。我们解释这些结果如下。样本对象具有不同的尘埃颗粒和分子的混合物，产生的消光曲线介于小麦哲伦云和大麦云云的平均消光曲线之间，其中紫外线凸起分别是不存在的或适度的。大多数尘埃嵌入发射紫外线的恒星星族，或者分布在星系中面之外。或者，即使是具有明显紫外线凸起的尘埃，就像平均Milky Way消光曲线一样，也可以存在并分布在星系中平面。在这种情况下，随波长或年龄相关的消光的连续散射的变化不足以解释先前的红化趋势。因此，必须调用额外的平面外尘埃。这些数据表明，紫外线碰撞的载体与中间年龄的恒星星族，而他们的生存在最苛刻的紫外线辐射领域，由于灰尘的自我屏蔽。[删节]
英文摘要：
Fundamental properties of the extinction curve, like the slope in the rest-frame ultraviolet (UV) and the presence/absence of a broad absorption excess centred at 2175 A (the UV bump), are investigated for a sample of 108 massive, star-forming galaxies at 1 < z < 2.5, selected from the FDF Spectroscopic Survey, the K20 survey, and the GDDS. These characteristics are constrained from a parametric description of the UV spectral energy distribution (SED) of a galaxy, as enforced by combined stellar population and radiative transfer models for different geometries, dust/stars configurations and dust properties. In at least one third of the sample, there is a robust evidence for extinction curves with at least a moderate UV bump. The presence of the carriers of the UV bump is more evident in galaxies with UV SEDs suffering from heavy reddening. We interpret these results as follows. The sample objects possess different mixtures of dust grains and molecules producing extinction curves in between the average ones of the Small and Large Magellanic Cloud, where the UV bump is absent or modest, respectively. Most of the dust embeds the UV-emitting stellar populations or is distributed out of the galaxy mid-plane. Alternatively, even dust with a pronounced UV bump, as for the average Milky-Way extinction curve, can be present and distributed in the galaxy mid-plane. In this case, variations of the continuum scattering albedo with wavelength or an age-dependent extinction are not sufficient to explain the previous trend with reddening. Hence, additional extraplanar dust has to be invoked. The data suggest that the carriers of the UV bump are associated with intermediate-age stellar populations, while they survive in the harshest UV-radiation fields owing to dust self-shielding. [abridged]
Deep 15um AKARI observations in the CDFS: estimating dust luminosities for a MIR-selected sample and for Lyman Break Galaxies and the evolution of L(dust)/L(UV) with the redshift
