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arXiv 2610.06346astro-ph.GA

猎户座SrcI方向FeS的试探性探测

Tentative Detection of FeS toward Orion SrcI

Aitana Tasa-Chaveli, Holger S. P. Müller, Álvaro Sánchez-Monge, Asunción Fuente, Adam Ginsburg, Thomas Möller

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中文总结 AI 辅助

本研究通过毫米波光谱计算在猎户座SrcI方向试探性探测到气态FeS,若确认将是星际介质中首次发现,其柱密度约1.7×10^15 cm^-2,支持FeS存在于星际尘埃中,但尚不能确定其主要硫储库角色。

中文摘要 AI 辅助

硫化铁(FeS)是天体物理环境中的一种关键耐火化合物。它常见于陨石中,而此前仅在原行星环境中以固态形式报道过FeS存在的证据。此外,FeS具有天体生物学意义,因为它是黄铁矿(FeS$_2$)形成的前体,而黄铁矿在厌氧代谢中起着关键作用。我们给出了气态FeS的毫米波光谱计算,并报告了其朝向大质量盘猎户座SrcI的试探性探测。若得到确认,这将是星际介质中气态FeS的首次探测。我们的数据与FeS柱密度约为$1.7 \ imes 10^{15}$ cm$^{-2}$相符。与其他硫储库相比,FeS中锁定的硫量比SO$_2$和SiS中所含的硫低三个数量级以上。然而,FeS发射可能来自不同区域,正如金属盐NaCl的情况那样。我们的结果支持FeS存在于星际尘埃中,并与尘埃破坏在FeS发射起源中起重要作用的观点一致。然而,目前的观测仍不足以判断FeS是分子云中的主要硫储库,还是耐火含铁物质的主要载体。

英文摘要

Iron sulfide (FeS) is a key refractory compound in astrophysical environments. It is commonly found in meteorites and evidence of FeS has only been reported in solid form in a protoplanetary environment. Furthermore, FeS is of astrobiological interest since it acts as a precursor to the formation of pyrite (FeS$_2$), which plays a key role in anaerobic metabolism. We present millimeter-wave spectroscopic calculations for gaseous FeS and report its tentative detection toward the massive disk Orion SrcI. If confirmed, this would constitute the first ever detection of gaseous FeS in the interstellar medium. Our data are consistent with a FeS column density of $\sim1.7 \times 10^{15}$ cm$^{-2}$. Comparing to other sulfur reservoirs, the amount of sulfur locked in FeS is more than three orders of magnitude lower than that contained in SO$_2$ and SiS. However, FeS emission may arise from a different region as it is the case for the metallic salt NaCl. Our results support the presence of FeS in interstellar grains and are consistent with grain destruction playing an important role in the origin of the FeS emission. The observations, however, are still insufficient to discern whether FeS is a main sulfur reservoir in molecular clouds or a primary carrier of refractory iron-bearing material.

发表机构

  • Centro de Astrobiología (CAB), CSIC-INTA(西班牙天体生物学中心(CAB),西班牙国家航空航天技术研究所与西班牙高等科学研究委员会联合)
  • Universidad Complutense de Madrid(马德里康普顿斯大学)
  • Astrophysik/I. Physikalisches Institut, Universität zu Köln(科隆大学第一物理研究所天体物理学部)
  • Institut de Ciències de l’Espai (ICE), CSIC(空间科学研究所,西班牙高等科学研究委员会)
  • Institut d’Estudis Espacials de Catalunya (IEEC)(加泰罗尼亚太空研究所)
  • Department of Astronomy, University of Florida(佛罗里达大学天文系)

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