论文标题
一块巨大的电离气体外壳，在M82附近发现了蜻蜓光谱线映射器探路者
A giant shell of ionized gas discovered near M82 with the Dragonfly Spectral Line Mapper pathfinder
论文作者
论文摘要
我们介绍了在Starbursting Galaxy M82领域发现了巨大的电离气体云。云中的排放量在H $α$和[NII] $λ$ 6583的数据中看到，虽然是一种小型探路仪器，用于测试将在Dragonfly Spectral Line Mapper中实现的关键想法，这是即将到来的UltranArrow-Band-Band-Band-Band-Band-band-band Imaging Image the Draginfly Fellyoto阵列的版本。发现的云具有类似壳的形态，线性范围为$ 0.8^{\ circ} $，并定位为$ 0.6^{\ circ} $ M82的西北。在M81组的HeliePentric距离处，云的范围对应于55 kpc，其与M82核的预计距离为40 kpc。云的平均h $α$表面亮度为$ 2 \ times10^{ - 18} $ $ $ \ $ \ mathrm {erg}〜\ mathrm {cm}^{ - 2}〜\ mathrm {s}} [nii] $λ$ 6583/h $α$ line的比例从[nii]/h $α$ $ $ \ sim0.2 $ to [nii]/h $α$ $ $ $ \ sim1.0 $跨越云中，其东端的值更高。使用Keck-Lris获得的后续光谱证实了[NII] $λ$ 6583/H $α$ = 0.340 $ = 0.340 $ \ pm $ 0.003和[SII] $λ$ 6716,6731/H $α$α$ = 0.64 $ = 0.64 $ \ pm $ 0.03 in Cloud cloud cloud cloud。这种巨大的材料云可以通过潮汐互动或强大的星爆。另外，它可能是从宇宙网中插入的气体，可能会由M82的超级风波促进。需要更深入的数据来进一步测试这些想法。即将到来的蜻蜓光谱线映射器将具有120个镜头，$ 40 \ times $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $。
We present the discovery of a giant cloud of ionized gas in the field of the starbursting galaxy M82. Emission from the cloud is seen in H$α$ and [NII]$λ$6583 in data obtained though a small pathfinder instrument used to test the key ideas that will be implemented in the Dragonfly Spectral Line Mapper, an upcoming ultranarrow-bandpass imaging version of the Dragonfly Telephoto Array. The discovered cloud has a shell-like morphology with a linear extent of $0.8^{\circ}$ and is positioned $0.6^{\circ}$ northwest of M82. At the heliocentric distance of the M81 group, the cloud's extent corresponds to 55 kpc and its projected distance from the nucleus of M82 is 40 kpc. The cloud has an average H$α$ surface brightness of $2\times10^{-18}$ $\mathrm{erg} ~\mathrm{cm}^{-2} ~\mathrm{s}^{-1} ~\mathrm{arcsec}^{-2}$. The [NII]$λ$6583/H$α$ line ratio varies from [NII]/H$α$ $\sim0.2$ to [NII]/H$α$ $\sim1.0$ across the cloud, with higher values found in its eastern end. Follow-up spectra obtained with Keck-LRIS confirm the existence of the cloud and yield line ratios of [NII]$λ$6583/H$α$ = 0.340 $\pm$ 0.003 and [SII]$λ$6716,6731/H$α$ = 0.64 $\pm$ 0.03 in the cloud. This giant cloud of material could be lifted from M82 by tidal interactions or by its powerful starburst. Alternatively, it may be gas infalling from the cosmic web, potentially precipitated by the superwinds of M82. Deeper data are needed to test these ideas further. The upcoming Dragonfly Spectral Line Mapper will have 120 lenses, $40\times$ more than in the pathfinder instrument used to obtain the data presented here.
