Spectral line survey of two LOSs : J/MNRAS/446/3842

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Authors : Armijos-Abendano J. orcid , Martin-Pintado J., Requena-Torres M.A. (hide) , Martin-Pintado J., Requena-Torres M.A. et..al

VizieR DOI : 10.26093/cds/vizier.74463842
Bibcode : 2015MNRAS.446.3842A (ADS) (Simbad) (Objects)
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CDS Keywords : Milky Way; Interstellar medium; Molecular clouds; Line Profiles
UAT : Milky Way Galaxy, Interstellar medium, Molecular clouds, Spectroscopy

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Inserted into VizieR : 16-Nov-2017
Last modification : 14-Aug-2024

3-mm spectral line survey of two lines of sight towards two typical cloud complexes in the Galactic Centre. (2015)

Keywords : ISM abundances - ISM: clouds - ISM: molecules - Galaxy: centre

Abstract: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 percent) 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 ...(more)
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Monthly Notices policies
The observations were carried out with the 22-m Mopra radio telescope in November 2007. We used the dual 3-mm Monolithic Microwave Integrated Circuit (MMIC) receiver connected to the 8-GHz spectrometer, which provided a velocity resolution of ~0.9 km/s at 90 GHz. Spectra in two polarizations were observed simultaneously. Two frequency ranges in the 3-mm window were covered, ~77-93 GHz and ~105-113 GHz. The beam size of the telescope was 38 arcsec at 90 GHz and 30 arcsec at 115 GHz. 


                


                

                    

                


                

                    

                


                

                    
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