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Paper: Large Scale Distribution of CN in the Central Molecular Zone: PDR or Weak XDR?
Volume: 439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies
Page: 33
Authors: Tanaka, K.; Oka, T.; Nagai, M.; Kamegai, K.
Abstract: We present the results of observation of the HCN and CN lines toward the Central Molecular Zone with the NRO 45m Telescope. The CN/HCN intensity ratio peaks near Sgr A* and decreases toward the outer region of the CMZ. This could be explained by the XDR model, if Sgr A* was in very active phase in recent past, although the value of the [CN]/[HCN] abundance ratio, ranging from 0.1 to 1, is explained better by the PDR model.
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