arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2206.04069astro-ph.HE
收藏

SRG/eROSITA-detected超新星遗迹G 116.6-26.1 I的首次光学鉴定。初步结果

First optical identification of the SRG/eROSITA-detected supernova remnant G 116.6-26.1 I. Preliminary results

E. V. Palaiologou, I. Leonidaki, M. Kopsacheili

摘要:

超新星遗迹(SNR)候选者G 116.6-26.1是迄今为止在几个波段探测到的少数高银河纬度($|b| > 15^o$)遗迹之一。它是最近在SRG/eROSITA全天空X射线巡天中发现的,也显示出低频弱射电特征。在这项研究中,我们报告了第一次光学检测G 116.6-26.1通过深,宽视场和更高分辨率的窄带成像在$\rm Hα$,[S II]和[O III]光。该物体在部分壳状结构中表现出两种主要的和不同的阴极发射结构。光学细丝的位置与现有的X射线、射电和紫外线图非常匹配,可以在相对较长的角距离(38'和70')上追踪,并且似乎不受与周围星际介质的任何强相互作用的影响。我们还提出了一个通量校准,光学发射光谱从一个单一的位置,与巴耳末和几个禁线检测,指示从冲击激发在一个典型的进化SNR的发射。G 116.6-26.1最可能的SNR性质的确认是由线比$\rm [S\, II] / Hα= 0.56 \pm 0.06$的观测值提供的,该观测值超过了广泛接受的阈值0.4,并且由几个冲击发射诊断测试的阳性结果进一步加强。我们的研究结果表明,一个近似的冲击波速度范围$70-100\, km\, s^{-1}$在光谱检查的灯丝,其中,当结合低发射率在$\rm Hα$和其他发射线,建议G 116.6-26.1是一个SNR在一个成熟的进化阶段。

英文摘要:

The supernova remnant (SNR) candidate G 116.6-26.1 is one of the few high Galactic latitude ($|b| > 15^o$) remnants detected so far in several wavebands. It was discovered recently in the SRG/eROSITA all-sky X-ray survey and displays also a low-frequency weak radio signature. In this study, we report the first optical detection of G 116.6-26.1 through deep, wide-field and higher resolution narrowband imaging in $\rm Hα$, [S II] and [O III] light. The object exhibits two major and distinct filamentary emission structures in a partial shell-like formation. The optical filaments are found in excellent positional match with available X-ray, radio and UV maps, can be traced over a relatively long angular distance (38' and 70') and appear unaffected by any strong interactions with the ambient interstellar medium. We also present a flux-calibrated, optical emission spectrum from a single location, with Balmer and several forbidden lines detected, indicative of emission from shock excitation in a typical evolved SNR. Confirmation of the most likely SNR nature of G 116.6-26.1 is provided from the observed value of the line ratio $\rm [S\, II] / Hα= 0.56 \pm 0.06$, which exceeds the widely accepted threshold 0.4, and is further strengthened by the positive outcome of several diagnostic tests for shock emission. Our results indicate an approximate shock velocity range $70-100\, km\, s^{-1}$ at the spectroscopically examined filament, which, when combined with the low emissivity in $\rm Hα$ and other emission lines, suggest that G 116.6-26.1 is a SNR at a mature evolutionary stage.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑