Lynds 1340的红外偏振研究：RNO 8的一个例子
Infrared polarisation study of Lynds 1340: A case of RNO 8
摘要：
本文描述了一个Lynds云，LDN 1340，$α$ = 2 h 32 m & $δ$ = $73^{\circ} 00^\prime$，对应于银河坐标$\ell=$ 130 $^{\circ}$ .07 $b=$ 11 $^{\circ}$ .6，重点是RNO 8区域的偏振研究。使用阿布山红外天文台的1.2米望远镜，使用近红外相机、光谱仪和偏振仪（NICSPol）仪器在红外波段观察到了该云。极化观测被用来绘制该地区周围的磁场几何形状。我们将我们的测量结果与2 MASS和WISE调查的档案数据相结合。盖亚EDR 3和DR 3在同一区域的数据被用于距离，自行和其他天体物理信息。数据的分析揭示了在RNO 8区域中具有有序偏振矢量的区域。位置角的测量揭示了偏振由于二向色消光这是一致的银河磁场。用R-Fermi方法计算了RNO 8区的磁场强度，估计值为$\sim$ 42 $μ$ G。
英文摘要：
This paper describes the polarisation study of a Lynds cloud, LDN 1340, $α$ = 2h32m & $δ$ = $73^{\circ} 00^\prime$ corresponding to galactic coordinates of $\ell=$ 130$^{\circ}$.07 $b=$ 11$^{\circ}$.6, with emphasis on the RNO 8 area. The cloud has been observed using the 1.2 m telescope at Mt.Abu Infrared Observatory, in the infrared wavelength band using the Near-Infrared Camera, Spectrograph & Polarimeter (NICSPol) instrument. The polarimetric observations were used to map the magnetic field geometry around the region. We combined our measurements with archival data from the 2MASS and WISE surveys. The Gaia EDR3 & DR3 data for the same region were used for distance, proper motion, and other astrophysical information. The analysis of the data reveals areas with ordered polarisation vectors in the region of RNO 8. The position angle measurements reveal polarisation due to dichroic extinction which is consistent with the Galactic magnetic field. The magnetic field strength was calculated for the RNO 8 region using the Chandrashekhar-Fermi method and the value estimated is $\sim$ 42$μ$G.
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