最近有报道称，在M31细胞核东南部发现了一个宽的、长的$\sim$ 1.5 $^{\circ}$ [OIII] 5007发射区$\sim$ 1.2 $^{\circ}$。超过100小时的宽视场曝光（3.48 $^{\circ} \times 2.32^{\circ}$）使这一开创性的检测基于30毫米窄带滤光片和几个配备大型相机的小型折射镜。我们报告的第一个速度测量在这个广泛的[OIII]发射线区域。我们使用低分辨率光谱仪MISTRAL（R $\sim$ 750），上普罗旺斯天文台193厘米望远镜的一个设施。速度测量基于H $α$、[NII]、[SII]和[OIII]线。拟合光谱的最佳解表明，H $α$和[OIII]的发射处于相同的日心视线速度，即-96 $\pm$ 4 km s $^{-1}$。这是在沿着$\sim$ 1.5 $^{\circ}$的长细丝的亮结上选择的$\sim$ 250弧秒$^2$的区域内测量的，连同4.2 $\pm$ 2.1 10 $^{-17}$ erg s $^{-1}$ cm $^{-2}$弧秒$^{-2}$的[OIII]5007表面亮度。这与先前的测量结果相当吻合。我们还估计H $α$ /[NII]线比率为$\sim$ 1.1。H $α$和[OIII]线的径向速度似乎表明这些氢原子和氧原子属于同一层，但我们不能排除另一个较弱的[OIII]线，属于另一种结构，也就是说，在另一个速度下，低于我们的检测阈值。人们考虑了不同的情况来解释这种结构。
英文摘要：
The discovery of a broad, $\sim$1.5$^{\circ}$ long filamentary [OIII] 5007 emission $\sim$1.2$^{\circ}$ south-east of the M31 nucleus has recently been reported. More than 100 hours of exposures of a wide field (3.48$^{\circ} \times 2.32^{\circ}$) have allowed this pioneering detection based on 30 Å narrow-band filters and several small refractors equipped with large cameras. We report a first velocity measurement in this extensive [OIII] emission line region. We used the low-resolution spectrograph MISTRAL (R $\sim$ 750), a facility of the Haute-Provence Observatory 193 cm telescope. The velocity measurement is based on the H$α$, [NII], [SII] and [OIII] lines. The best solution to fit the spectrum indicates that the H$α$ and [OIII] emissions are at the same heliocentric line-of-sight velocity of -96$\pm$4 km s$^{-1}$. This was measured within an area of $\sim$250 arcsec$^2$ selected on a bright knot along the long filament of $\sim$1.5$^{\circ}$, together with a [OIII]5007 surface brightness of 4.2$\pm$2.1 10$^{-17}$ erg s$^{-1}$ cm$^{-2}$ arcsec$^{-2}$. This agrees moderately well with the previous measurement. We also estimated the H$α$/[NII] line ratio as $\sim$1.1. The radial velocities at which the H$α$ and [OIII] lines were detected seem to show that these hydrogen and oxygen atoms belong to the same layer, but we cannot exclude that another weaker [OIII] line, belonging to another structure, that is, at another velocity, is below our detection threshold. Different scenarios have been considered to explain this filamentary structure...
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