3-mm spectral line survey of two lines of sight towards two typical cloud complexes in the Galactic Centre
- Armijos-Abendaño, Jairo
- Martin-Pintado, J.
- Requena-Torres, M.A.
- Martin, S.
- Rodriguez-Franco, A.
DOIAbstract
We present the results of two Mopra 3-mm spectral line surveys of the lines of sight (LOS) towards the Galactic Centre (GC) molecular complexes Sgr B2 (LOS+0.693) and Sgr A (LOS−0.11). The spectra covered the frequency ranges of ∼77–93 GHz and ∼105–113 GHz. We have detected 38 molecular species and 25 isotopologues. The isotopic ratios derived from column density ratios are consistent with the canonical values, indicating that chemical isotopic fractionation and/or selective photodissociation can be considered negligible (<10 per cent) for the GC physical conditions. The derived abundances and rotational temperatures are very similar for both LOSs, indicating very similar chemical and excitation conditions for the molecular gas in the GC. T...
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