猎户座KL方向DCN和DCO$^+$的大尺度成图观测
星系天体物理
2024-01-15 v1
摘要
我们呈现了使用大毫米望远镜(LMT)上名为B4R的2 mm接收系统获得的猎户座KL方向2 mm波段DCN(J=2-1)和DCO(J=2-1)谱线的发射图(1.5'×1.5'尺度，对应0.18 pc)。DCN发射在猎户座KL热核位置显示峰值，而那里未探测到DCO发射。DCO发射在热核西侧增强，该区域很好地屏蔽了来自猎户座四边形星团中OB大质量恒星的紫外辐射。我们推导了同时探测到这两种物质的三个代表性位置的DCN/DCO丰度比。V_LSR ≈ 7.5-8.7 km/s的气体成分对应低丰度比(~4-6)，而V_LSR ≈ 9.2-11.6 km/s的气体成分则得到高得多的丰度比(~22-30)。我们将观测到的丰度比与化学模型进行了比较，发现观测到的DCN/DCO丰度比差异可由不同密度解释。
引用
@article{arxiv.2401.06297,
title = {Large-Scale Mapping Observations of DCN and DCO$^+$ toward Orion KL},
author = {Kotomi Taniguchi and Prathap Rayalacheruvu and Teppei Yonetsu and Tatsuya Takekoshi and Bunyo Hatsukade and Kotaro Kohno and Tai Oshima and Yoichi Tamura and Yuki Yoshimura and Víctor Gómez-Rivera and Sergio Rojas-García and Arturo I. Gómez-Ruiz and David H. Hughes and F. Peter Schloerb and Liton Majumdar and Masao Saito and Ryohei Kawabe},
journal= {arXiv preprint arXiv:2401.06297},
year = {2024}
}
备注
Accepted by The Astrophysical Journal, 13 pages, 5 figures, 5 tables