High abundance ratio of 13CO to C18O toward photon-dominated regions in the Orion-A giant molecular cloud

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Fig. 1

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Peak intensity map in the ¹²CO (J = 1–0) line in units of K (T_MB). The data are from Shimajiri et al. (2011) and Nakamura et al. (2012). A dashed box shows the ¹³CO (J = 1–0) and C¹⁸O (J = 1–0) observing region. The ¹²CO data in FITS format are available at the NRO web page via http://www.nro.nao.ac.jp/~nro45mrt/html/results/data.html and at the CDS.

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