Minh Y C, Dickens J E, Irvine W M, McGonagle D
Korea Astronomy Observatory, Taejon.
Astron Astrophys. 1995 Jun 1;298(1):213-8.
H2(13)CO has been detected for the first time toward cold dark molecular clouds using the NRAO 12 m telescope. The H2(13)CO ortho/para abundance ratio R for B335, which we report as R approximately 1.7, suggests equilibrium at the local kinetic temperature and appears to be distinctly different from that for both TMC-1 and L134N, where R is close to or higher than the statistical value 3. Since only B335 among the observed positions includes an imbedded IR source, this difference may result from heating of the grain surfaces, providing the energy necessary for desorption of formaldehyde formed on the grains.
利用美国国家射电天文台12米望远镜首次在寒冷黑暗分子云中探测到H₂¹³CO。我们报告的B335的H₂¹³CO正/仲丰度比R约为1.7，这表明在当地动力学温度下达到了平衡，并且似乎与TMC - 1和L134N的情况明显不同，在TMC - 1和L134N中R接近或高于统计值3。由于在观测位置中只有B335包含一个嵌入的红外源，这种差异可能是由颗粒表面加热导致的，颗粒表面加热为颗粒上形成的甲醛解吸提供了所需的能量。
