英仙座致密核的氨光谱图集
An Ammonia Spectral Atlas of Dense Cores in Perseus
摘要：
我们目前的氨观测的193致密核心和核心候选人在英仙座分子云使用罗伯特F。伯德格林班克望远镜。在23 GHz附近，我们同时观测到了NH3（1，1），NH3（2，2），CCS（2_1 -> 1_0）和CC 34 S（2_1 -> 1_0）跃迁，光谱分辨率dv ~ 0.024 km/s。我们发现氨排放与几乎所有的（亚）毫米源，以及在几个位置没有相关的连续排放。对于每一个检测，我们已经测量的物理性质，通过拟合一个简单的模型，以每一个谱线同时。在适当的情况下，我们通过考虑低光学深度，沿视线的多个组件和GBT光束的不完美耦合来改进模型。对于英仙座的核心，我们发现一个典型的动力学温度T=11 K，一个典型的N（NH3）~ 10^14.5 /cm^2的柱密度和速度分散范围从sigma_v = 0.07 km/s到0.7 km/s。然而，许多速度频散> 0.2 km/s的岩心显示出沿视线存在多个速度分量的证据。
英文摘要：
We present ammonia observations of 193 dense cores and core candidates in the Perseus molecular cloud made using the Robert F. Byrd Green Bank Telescope. We simultaneously observed the NH3(1,1), NH3(2,2), CCS (2_1 -> 1_0) and CC34S (2_1 -> 1_0) transitions near 23 GHz for each of the targets with a spectral resolution of dv ~ 0.024 km/s. We find ammonia emission associated with nearly all of the (sub)millimeter sources as well as at several positions with no associated continuum emission. For each detection, we have measured physical properties by fitting a simple model to every spectral line simultaneously. Where appropriate, we have refined the model by accounting for low optical depths, multiple components along the line of sight and imperfect coupling to the GBT beam. For the cores in Perseus, we find a typical kinetic temperature of T=11 K, a typical column density of N(NH3)~ 10^14.5 /cm^2 and velocity dispersions ranging from sigma_v = 0.07 km/s to 0.7 km/s. However, many cores with velocity dispersions > 0.2 km/s show evidence for multiple velocity components along the line of sight.
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