Intensity ratios for XDR/PDR identification

C. E. Green, M. R. Cunningham, J. A. Green, J. R. Dawson, P. A. Jones, R. López-Sánchez, L. Verdes-Montenegro, C. Henkel, W. A. Baan, S. Martín

Research output: Contribution to journalConference paper


The intensity ratios of HCO+/HCN and HNC/HCN (1-0) reveal the relative influence of star formation and active galactic nuclei (AGN) or black holes on the circum-nuclear gas of a galaxy, allowing the identification of X-ray dominated regions (XDRs) and Photon-dominated regions (PDRs). It is not always clear in the literature how this intensity ratio calculation has been, or should be performed. This paper discusses ratio calculation methods for interferometric data.

Original languageEnglish
Article numberE30
Pages (from-to)1-2
Number of pages2
JournalProceedings of the International Astronomical Union
Issue numberS315
Publication statusPublished - 12 Sep 2016
Event315th Symposium of the International Astronomical Union - Honolulu, United States
Duration: 3 Aug 20157 Aug 2015

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