论文标题
与斯蒂芬的五重奏有关的大规模，常规的层间磁场？
A large-scale, regular intergalactic magnetic field associated with Stephan's Quintet?
论文作者
论文摘要
常规的磁场经常在星系的郊区和郊区发现，但是对于银河系组，它们的存在，特性和起源尚未建立。根据Westerbork合成射电望远镜（WSRT）的宽带无线电极化成像，我们利用旋转测量合成来从磁场上分离出在内部，后面或Stephan的Quintet（HCG92，SQ）内部，后面或在各种尺度上的磁场贡献。我们认识到一个大规模，真正规则的磁性屏幕的签名，看似被限制在五重奏本身上。尽管我们不能从银河系中排除贡献，但我们的分析有利于SQ系统中的磁性结构。如果确实与有关的星系组相关联，它将跨越至少$ 60 \，\ times \，40 \，\ times \，20 \，\ mathrm {kpc} $，并且具有至少与以前在大型螺旋星系中检测到的强度一样高。然后，该磁场将超过任何其他已知的银河，常规磁场的范围，它们具有相当大的微果石的强度，并且将是除星系对以外的星系系统中这种结构的第一个已知示例。还提出和评估了其他一些解释。
Regular magnetic fields are frequently found within and in the outskirts of galaxies, but their presence, properties, and origin has not yet been established for galaxy groups. On the basis of broadband radio polarimetric imaging with the Westerbork Synthesis Radio Telescope (WSRT), we made use of Rotation Measure Synthesis to disentangle contributions from magnetic fields on various scales for several polarised radio sources inside, behind, or in the vicinity of the Stephan's Quintet (HCG92, SQ). We recognise the signature of a large-scale, genuinely regular, magnetised screen, seemingly constrained to the Quintet itself. Although we cannot exclude a contribution from the Milky Way, our analysis favours a magnetic structure within the SQ system. If indeed associated with the galaxy group in question, it would span a volume of at least $60\,\times\,40\,\times\,20\,\mathrm{kpc}$ and have a strength at least as high as that previously detected within large spiral galaxies. This field would then surpass the extent of any other known galactic, regular magnetic fields, have a considerable strength of a few microgauss, and would be the first known example of such a structure in a galaxy system other than a galaxy pair. Several other explanations are also presented and evaluated.
