Methanimine in Cool Cosmic Objects Using Accurate Collisional Rate Coefficients

IF 0.6 4区 物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Astrophysics Pub Date : 2024-10-14 DOI:10.1007/s10511-024-09838-x
S. Chandra, M. K. Sharma
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Abstract

Accurate collisional rate coefficients for collisional transitions between 15 rotational levels of methanimine, colliding with p-H2 molecule, are available. Methanimine is a planar, asymmetric top molecule having electric dipole moment with components μa = 1.3396 Debye and μb = 1.4461 Debye, and thus, producing both the a and b type spectral lines of nearly equal intensities. Therefore, all the rotational levels need to be considered together. Between 15 rotational levels, 105 collisional transitions are considered in an investigation by others. We have discussed that each level is not connected with all others through the collisions, and therefore, there should be 77 instead of 105 collisional transitions between 15 levels of methanimine. With availability of accurate collisional rate coefficients, it is worth to perform the Sobolev analysis of methanimine. We have found six weak MASER transitions, 110-111, 211-212, 312-313, 41.3-41.4, 303-212 and 40.4-31.3, and one transition 111-202, showing anomalous absorption. These seven lines may play important role for the methanimine.

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利用精确的碰撞率系数研究冷宇宙天体中的甲烷化物
我们获得了甲亚胺与 p-H2 分子碰撞时 15 个旋转水平之间碰撞跃迁的精确碰撞速率系数。甲亚胺是一个平面的不对称顶分子,其电偶极矩分量为 μa = 1.3396 Debye 和 μb = 1.4461 Debye,因此会产生强度几乎相等的 a 型和 b 型光谱线。因此,所有的旋转级都需要一并考虑。在其他人的研究中,考虑了 15 个旋转水平之间的 105 个碰撞跃迁。我们已经讨论过,每个水平并不是通过碰撞与其他所有水平相连接的,因此甲亚胺的 15 个水平之间应该有 77 个而不是 105 个碰撞跃迁。有了准确的碰撞速率系数,就值得对甲亚胺进行索波列夫分析。我们发现了 110-111、211-212、312-313、41.3-41.4、303-212 和 40.4-31.3 六条弱 MASER 过渡线,以及 111-202 一条显示异常吸收的过渡线。这七条线可能对甲烷亚胺起着重要作用。
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来源期刊
Astrophysics
Astrophysics 地学天文-天文与天体物理
CiteScore
0.90
自引率
20.00%
发文量
32
审稿时长
6-12 weeks
期刊介绍: Astrophysics (Ap) is a peer-reviewed scientific journal which publishes research in theoretical and observational astrophysics. Founded by V.A.Ambartsumian in 1965 Astrophysics is one of the international astronomy journals. The journal covers space astrophysics, stellar and galactic evolution, solar physics, stellar and planetary atmospheres, interstellar matter. Additional subjects include chemical composition and internal structure of stars, quasars and pulsars, developments in modern cosmology and radiative transfer.
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