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| molecules:ism:proh [2022/06/28 16:54] – mueller | molecules:ism:proh [2022/08/04 11:33] – mueller |
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| reported on\\ | reported on\\ |
| **[[https://doi.org/10.1051/0004-6361/202142699|Precursors of Fatty Alcohols in the ISM: Discovery of //n//-Propanol]]**\\ | **[[https://doi.org/10.1051/0004-6361/202142699|Precursors of Fatty Alcohols in the ISM: Discovery of //n//-Propanol]]**\\ |
| //Astron. Astrophys.//, (2022), in press.\\ | //Astron. Astrophys.// **663** (2022), Art. No. A181.\\ |
| Transitions of the //Ga// and //Aa// conformers of 1-propanol were observed in the course of a molecular line survey of the quiescent giant molecular cloud G+0.693−0.027, about 1' north-east of Sagittarius (Sgr) B2(N) carried out with the Yebes 40 m dish at 7 mm and with the IRAM 30 m dish at 3, 2, and 1 mm. The identified transitions cover the 2 to 7 mm regions 2 ≤ //J// ≤ 11 and //K<sub>a</sub>// ≤ 6 for //Ga// and 2 ≤ //J// ≤ 12 and //K<sub>a</sub>// ≤ 3 for //Aa//. The number of clean, slightly or partly blended transitions is sufficiently large for both conformers together and for //Ga// alone. The excitation temperature is about 13 K. //n//-Propanol is about a factor of 15 less abundant than ethanol which, in turn, is about a factor of 25 less abundant than methanol.\\ | Transitions of the //Ga// and //Aa// conformers of 1-propanol were observed in the course of a molecular line survey of the quiescent giant molecular cloud G+0.693−0.027, about 1' north-east of Sagittarius (Sgr) B2(N) carried out with the Yebes 40 m dish at 7 mm and with the IRAM 30 m dish at 3, 2, and 1 mm. The identified transitions cover the 2 to 7 mm regions 2 ≤ //J// ≤ 11 and //K<sub>a</sub>// ≤ 6 for //Ga// and 2 ≤ //J// ≤ 12 and //K<sub>a</sub>// ≤ 3 for //Aa//. The number of clean, slightly or partly blended transitions is sufficiently large for both conformers together and for //Ga// alone. The excitation temperature is about 13 K. //n//-Propanol is about a factor of 15 less abundant than ethanol which, in turn, is about a factor of 25 less abundant than methanol.\\ |
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| The authors also reported the first detection of //n//-propanol in a star-forming region. Interestingly, eight transitions of the higher lying //Gg'// conformer with 8 ≤ //J// ≤ 12 and //K<sub>a</sub>// ≤ 4 and five transitions of the higher lying //Ag// conformer with 12 ≤ //J// ≤ 15 and //K<sub>a</sub>// ≤ 6 were detected. Transitions of the lower lying conformers were also present, but all were blended more or less severely. Rotational temperatures of 135 K were inferred. The iso to normal ratio is about 0.6, fairly similar to the 0.4 ratio in the case of the two propyl cyanide isomers. In addition, //n//-propanol is about a factor of 18 less abundant than ethanol which, in turn, is about a factor of 19 less abundant than methanol.\\ | The authors also reported the first detection of //n//-propanol in a star-forming region. Interestingly, eight transitions of the higher lying //Gg'// conformer with 8 ≤ //J// ≤ 12 and //K<sub>a</sub>// ≤ 4 and five transitions of the higher lying //Ag// conformer with 12 ≤ //J// ≤ 15 and //K<sub>a</sub>// ≤ 6 were detected. Transitions of the lower lying conformers were also present, but all were blended more or less severely. Rotational temperatures of 135 K were inferred. The iso to normal ratio is about 0.6, fairly similar to the 0.4 ratio in the case of the two propyl cyanide isomers. In addition, //n//-propanol is about a factor of 18 less abundant than ethanol which, in turn, is about a factor of 19 less abundant than methanol.\\ |
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| The Max-Planck-Institut für Radioastronomie issued a press release in **[[https://www.mpifr-bonn.mpg.de/pressreleases/2022/10?c=9060|English]]** and in **[[https://www.mpifr-bonn.mpg.de/pressemeldungen/2022/10?c=8727|German]]** | The Max-Planck-Institut für Radioastronomie issued a press release in **[[https://www.mpifr-bonn.mpg.de/pressreleases/2022/10?c=9060|English]]** and in **[[https://www.mpifr-bonn.mpg.de/pressemeldungen/2022/10?c=8727|German]]**. Similar press releases were issued by the **[[https://www.mpg.de/18884791/sanitizer-in-the-galactic-centre-region|Max Planck Society]]** and by the **[[https://portal.uni-koeln.de/en/universitaet/aktuell/press-releases/single-news/a-sanitizer-in-the-galactic-centre-region|Universität zu Köln]]**. |
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