论文标题
发现了两个进化的行星星云M 2-55和Abell 2周围的扩展结构
Discovery of Extended Structures around Two Evolved Planetary Nebulae M 2-55 and Abell 2
论文作者
论文摘要
我们报告了M 2-55的两个进化的行星星云（PNS）M 2-55和Abell 2的多波长研究。深度光学窄带图像（[O III]，H？和[N II]）揭示了两对双极裂片和一个新的微弱的ARC样结构。 M 2-55周围的弧形灯丝从西南到东南出现明确的边界，这强烈表明这种星云与周围的星际介质相互作用。从广场红外调查探险家（WISE）全套调查的成像数据中，我们发现了这些PN周围广泛的中红外光晕，它们的主要星云大约是其在可见光中看到的主要星云的两倍。我们还提出了M 2-55的中分辨率光谱，这表明它是一种高兴奋的PN，低电子密度为250 cm^-3。此外，我们通过档案数据从其光谱能量分布（SED）中研究了这些星云的特性。
We report a multi-wavelength study of two evolved planetary nebulae (PNs) M 2-55 and Abell 2. Deep optical narrow-band images ([O III], H?, and [N II]) of M 2-55 reveal two pairs of bipolar lobes and a new faint arc-like structure. This arc-shaped filament around M 2-55 appears a well-defined boundary from southwest to southeast, strongly suggesting that this nebula is in interaction with its surrounding interstellar medium. From the imaging data of Wide-field Infrared Survey Explorer (WISE) all-sky survey, we discovered extensive mid-infrared halos around these PNs, which are approximately twice larger than their main nebulae seen in the visible. We also present a mid-resolution optical spectrum of M 2-55, which shows that it is a high-excitation evolved PN with a low electron density of 250 cm^-3. Furthermore, we investigate the properties of these nebulae from their spectral energy distributions (SEDs) by means of archival data.
