arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2602.08756astro-ph.GA
收藏

异常的星际HI特征及与其相关的白矮星位于上Sco-Cen OB2星团周围HI空腔内

An unusual pair of interstellar HI features and a related white dwarf star inside the HI cavity surrounding the Upper Sco-Cen OB2 Association

Gerrit L. Verschuur

AI总结:

研究发现上Sco-Cen OB2星团周围HI空腔中存在古老行星状星云残余物,其HI特征可能源于3 x 10^5年前的行星状星云。

摘要:

在上Sco-Cen OB2星团方向的高分辨率21厘米调查数据中发现了两个神秘的未解析HI结构,其速度分别为+12和-6 km/s。对这一天空区域HI形态的检查显示,该星体和HI特征存在于围绕上Sco-Cen OB2星团的星际HI空腔中。该空腔可能是由一次古老的超新星爆炸形成的。推测在该区域附近发现的HI特征对和丝状HI结构可能是3 x 10^5年前一个行星状星云的残余物,这些残余物已冷却到气体中性,从而发射21厘米谱线。该残余物保持了原始行星状星云的形态特征,因为它扩展到了一个相对缺乏星际气体的空间体积,否则会吸收原始星云的任何痕迹。

英文摘要:

Two mysterious unresolved HI structures at velocities of +12 and -6 km/s were discovered in high resolution 21-cm survey data in the direction of a faint white dwarf star. Examination of the HI morphology in this area of sky shows that the star and HI features exists in a large cavity in interstellar HI surrounding the Upper Sco-Cen OB2 Association. The cavity may have been created by an ancient supernova. It is hypothesized that the pair of HI features and filamentary HI structure found in its immediate vicinity may be the remnants of a planetary nebula some 3 x 10^5 years old that have cooled to the point that the gas is neutral and emitting the 21-cm spectral line. This remnant has maintained the morphological characteristics of the original planetary nebula because it expanded into a volume of space relatively devoid of interstellar gas that would otherwise have absorbed any traces of the original nebula.

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。

↑