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• W2029591054 endingPage "47" @default.
• W2029591054 startingPage "47" @default.
• W2029591054 abstract "We present new observations of HCN and HCO+ in the circumnuclear disk (CND) of the Galaxy, which we obtained with the Atacama Pathfinder Experiment telescope. We mapped emission in rotational lines of HCN J = 3–2, 4–3, and 8–7, as well as of HCO+ J = 3–2, 4–3, and 9–8. We also present spectra of H13CN J = 3–2 and 4–3 as well as H13CO+ J = 3–2 and 4–3 toward four positions in the CND. Using the intensities of all of these lines, we present an excitation analysis for each molecule using the non-LTE radiative transfer code RADEX. The HCN line intensities toward the northern emission peak of the CND yield log densities (cm−3) of 5.6, consistent with those measured with HCO+ as well as with densities recently reported for this region from an excitation analysis of highly excited lines of CO. These densities are too low for the gas to be tidally stable. The HCN line intensities toward the CND's southern emission peak yield log densities of 6.5, higher than densities determined for this part of the CND with CO (although the densities measured with HCO+, log [n] = 5.6, are more consistent with the CO-derived densities). We investigate whether the higher densities we infer from HCN are affected by midinfrared radiative excitation of this molecule through its 14 μm rovibrational transitions. We find that radiative excitation is important for at least one clump in the CND, where we additionally detect the J = 4–3, v2 = 1 vibrationally excited transition of HCN, which is excited by dust temperatures of ≳125–150 K. If this hot dust is present elsewhere in the CND, it could lower our inferred densities, potentially bringing the HCN-derived densities for the southern part of the CND into agreement with those measured using HCO+ and CO. Additional sensitive, high-resolution submillimeter observations, as well as midinfrared observations, would be useful to assess the importance of the radiative excitation of HCN in this environment." @default.
• W2029591054 created "2016-06-24" @default.
• W2029591054 creator A5013322008 @default.
• W2029591054 creator A5024441485 @default.
• W2029591054 creator A5058769617 @default.
• W2029591054 creator A5059319698 @default.
• W2029591054 date "2013-11-25" @default.
• W2029591054 modified "2023-10-18" @default.
• W2029591054 title "THE EXCITATION OF HCN AND HCO⁺IN THE GALACTIC CENTER CIRCUMNUCLEAR DISK" @default.
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• W2029591054 doi "https://doi.org/10.1088/0004-637x/779/1/47" @default.
• W2029591054 hasPublicationYear "2013" @default.
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