Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ===== On the Detection of Iminopropadienylidene, HNC3, in the ISM ===== K. Kawaguchi, S. Takano, M. Ohishi, S.-I. Ishikawa, K. Miyazawa, N. Kaifu, K. Yamashita, S. Yamamoto, S. Saito, Y. Ohshima, and Y. Endo\\ reported on the\\ **[[https://ui.adsabs.harvard.edu/abs/1992ApJ...396L..49K|Detection of HNCCC in TMC-1]]**\\ //Astrophys. J.// **396**, L49 (1992).\\ The Nobeyama 45 m telescope was used to detect the //J// = 3 – 2, 4 – 3, and 5 – 4 transitions near 28.0, 37.3, and 46.7 GHz. The [[http://www.astro.uni-koeln.de/site/vorhersagen/molecules/ism/HCCNC.html|HCCNC]] isomer was found only slightly earlier, whereas the HC<sub>3</sub>N isomer had been known for a considerable time.\\ \\ P. D. Gensheimer reported on\\ **[[https://doi.org/10.1023/A:1000744924767|Observations of HCCNC and HNCCC in IRC+10216]]**\\ //Astrophys. Space Sci.// **251**, 199 (1997).\\ The NRAO 12 m telescope was used to detect the //J// = 11 – 10 transition near 102.7 GHz. The HCCNC to HNC<sub>3</sub> ratio is about 8, similar to that in TMC-1. Because of only one detected line, this report should be viewed with some caution.\\ \\ C. Vastel, K. Kawaguchi, D. Quénard, M. Ohishi, B. Lefloch, R. Bachiller, and H. S. P. Müller\\ used the IRAM 30 m telescope for\\ **[[https://doi.org/10.1093/mnrasl/slx197|High Spectral Resolution Observations of HNC<sub>3</sub> and HCCNC in the L1544 Pre-stellar Core]]**\\ //Mon. Not. R. Astron. Soc.// **474**, L76 (2018).\\ The //J// = 8 – 7, 9 – 8, and 10 – 9 transitions were detected near 74.7, 84.0, and 93.4 GHz. The column density is only slightly smaller than that in TMC-1, similar to HCCNC, even though HC<sub>3</sub>N is less abundant by about one order of magnitide in L1544 compared to TMC-1.\\ \\ J. Cernicharo, N. Marcelino, M. Agúndez, C. Bermúdez, C. Cabezas, B. Tercero, and J. R. Pardo\\ reported on the\\ **[[https://doi.org/10.1051/0004-6361/202039274|Discovery of HC<sub>4</sub>NC in TMC-1: A study of the isomers of HC<sub>3</sub>N, HC<sub>5</sub>N, and HC<sub>7</sub>N]]**\\ //Astron. Astrophys.// **642**, Art. No. L8 (2020).\\ The authors report the detection of DNC<sub>3</sub>. The observations were obtained with the Yebes 40m radio telescope in the course of a line survey covering 31.0–50.3 GHz.\\ \\ J. Cernicharo, B. Tercero, C. Cabezas, M. Agúndez, E. Roueff, R. Fuentetaja, N. Marcelino, and P. de Vicente\\ carried out more recently a\\ **[[https://doi.org/10.1051/0004-6361/202348822|Study of the HCCNC and HNCCC isotopologs in TMC-1]]**\\ //Astron. Astrophys.// **682**, Art. No. L13 (2024).\\ They reported in the framework of improved data of the above survey the detection of the three HNC<sub>3</sub> <sup>13</sup>C isotopomers. They determined the <sup>12</sup>C/<sup>13</sup>C ratios of ~90 with scatter that is insignificant with respect to the uncertainties. These values are somewhat lower than ~65 usually found in the the local ISM, but very similar to values of HCCNC <sup>13</sup>C isotopomers and to two of the three HC<sub>3</sub>N <sup>13</sup>C isotopomers. In addition, an H/D ratio of ~53 was reported, similar to the value of 57 ± 2 of HC<sub>3</sub>N.\\ \\ ---- Contributor(s): H. S. P. Müller; 12, 2017; 11, 2020; 04, 2024 ---- molecules/ism/hnc3.txt Last modified: 2024/04/08 17:59by mueller