大型星际极化巡天。LIPS I：南半球的FORS2分光偏振测量
Large Interstellar Polarisation Survey. LIPS I: FORS2 spectropolarimetry in the Southern Hemisphere
摘要：
通过星际云传播的光的偏振研究可能会对星际尘埃颗粒的性质产生限制。传统上，宽带线偏振（BBLP）测量被认为是星际尘埃研究的重要诊断工具，而相对较少关注分光偏振测量。然而，分光偏振法可能比BBLP提供更强的约束，例如通过揭示窄带特征，并允许我们区分尘埃的贡献和星际气体的贡献。因此，我们决定在两个半球使用分光偏振设施进行大型星际偏振调查（LIPS）。在这里，我们提出了在南半球获得的结果与欧洲南方天文台甚大望远镜FORS 2仪器。我们的光谱覆盖380- 950 nm的波长范围，光谱分辨力约为880。我们已经制作了一个公开的目录101个目标的127个线性偏振光谱。我们还提供了Serkowski曲线参数，以及沿76个不同的视线的星际偏振的偏振位置角的波长梯度。与以前的文献一致，我们发现Serkowski曲线的最佳拟合参数不是相互独立的。然而，我们获得的关系并不总是与以前的研究中发现的一致。
英文摘要：
Polarimetric studies of light transmitted through interstellar clouds may give constraints on the properties of the interstellar dust grains. Traditionally, broadband linear polarisation (BBLP) measurements have been considered an important diagnostic tool for the study of the interstellar dust, while comparatively less attention has been paid to spectropolarimetric measurements. However, spectropolarimetry may offer stronger constraints than BBLP, for example by revealing narrowband features, and by allowing us to distinguish the contribution of dust from the contribution of interstellar gas. Therefore, we have decided to carry out a Large Interstellar Polarisation Survey (LIPS) using spectropolarimetric facilities in both hemispheres. Here we present the results obtained in the Southern Hemisphere with the FORS2 instrument of the ESO Very Large Telescope. Our spectra cover the wavelength range 380--950\,nm at a spectral resolving power of about 880. We have produced a publicly available catalogue of 127 linear polarisation spectra of 101 targets. We also provide the Serkowski-curve parameters, as well as the wavelength gradient of the polarisation position angle for the interstellar polarisation along 76 different lines of sight. In agreement with previous literature, we found that the best-fit parameters of the Serkowski-curve are not independent of each other. However, the relationships that we obtained are not always consistent with what was found in previous studies.
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