Detection of complex nitrogen-bearing molecule ethyl cyanide towards the hot molecular core G10.47+0.03

The studies of the complex organic molecular lines towards the hot molecular cores at millimeter and submillimeter wavelengths provide instructive knowledge about the chemical complexity in the interstellar medium (ISM). We present the detection of the rotational emission lines of the complex nitrogen-bearing molecule ethyl cyanide (C2H5CN) towards the chemically rich hot molecular core G10.47 + 0.03 using the Atacama Large Millimeter/Submillimeter Array (ALMA) band 4 observations. The estimated column density of C2H5CN towards the G10.47 + 0.03 is (7.7 +/- 0.5) x 10(16) cm(-2) with the high rotational temperature of 352.9 +/- 66.8 K. The estimated fractional abundance of C2H5CN with respect to H-2 towards the G10.47 + 0.03 is 5.70 x 10(-9). We observe that the estimated fractional abundance of C2H5CN is similar to the existing three-phase warm-up chemical modelling abundance of C2H5CN. We also discuss the possible formation mechanism of C2H5CN towards the hot molecular cores, and we claim the barrierless and exothermic radical-radical reaction between CH2 and CH2CN is responsible for the production of low abundance of C2H5CN (similar to 10(-9)) in the grain surface of G10.47 + 0.03.

Automated summary

The detection of complex organic molecule ethyl cyanide (C2H5CN) in the hot molecular core G10.47 + 0.03 using the Atacama Large Millimeter/Submillimeter Array (ALMA) provides valuable insight into the chemical complexity in the interstellar medium. The estimated column density of C2H5CN is (7.7 +/- 0.5) x 10(16) cm(-2) with a high rotational temperature of 352.9 +/- 66.8 K. The fractional abundance of C2H5CN with respect to H-2 is 5.70 x 10(-9). The similarity between the observed fractional abundance and the existing warm-up chemical modeling abundance suggests a possible formation mechanism involving a radical-radical reaction.