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Persistent URL http://purl.org/net/epubs/work/10865428
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Record Id 10865428
Title Gas and dust in the Galactic Centre - ISO LWS, submillimetre line and continuum observations
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Abstract The Infrared Space Observatory (ISO) Long wavelength Spectrometer (LWS) has been used to map distribution of the emission from a sample of 22 atomic, molecular and ionised lines toward the Circumnuclear Disk at the Galactic Centre. The circumnuclear disc is clearly seen in the maps of molecular lines such as CO and OH, whilst the central region dominates in other atomic and ionised lines such as [O III] and [N III]. The ISO-LWS spectrum toward Sgr A^* is best represented by the sum of three blackbody curves of 90, 44.5 and 16 K, superposed with 22 lines, including CO, OH, [O I], [O III], [N II], [C II] and H_2O. The CO 4.7 ?m absorption band head observed with the ISO SWS spectrometer toward SgrA^* is modeled as having a cold component with Trot = 10 K, for which we estimate N(CO)=7.7× 1018 cm-2, N(13CO) = 1.7× 1017 cm-2 and N(C18O)= 2.1× 1016 cm-2, and a warm component by n(H_2) = 1× 10^5 cm-3, T_k = 70 K, N(CO) = 3.9× 1018 cm-2, N(13CO)= N(CO)/40, N(C18O)= N(CO). Observations of hydrogen recombination lines toward SgrA^* are moddeled as representing a line of sight extiction A_V˜ 24 -28 magnitudes. The SCUBA data at 450 and 850 ?m are used in this paper in order to make an estimation of the CND mass of ˜ 2.3× 10^4 M?, after removal of the free-free contribution and the local background. http://adsabs.harvard.edu/abs/2011IAUS..280P.155E
Organisation STFC , RALSP
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Language English (EN)
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Journal Article IAU Symp 280 (2011): 155. 2011
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