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

The studies of the complex 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 presented the detection of the rotational emission lines of the complex nitrogen-bearing molecule ethyl cyanide (C$_{2}$H$_{5}$CN) towards the hot molecular core G10.47+0.03 using the Atacama Large Millimeter/Submillimeter Array (ALMA) band 4 observations. The estimated column density of C$_{2}$H$_{5}$CN towards G10.47+0.03 was (9.5$\pm$0.1)$\times$10$^{16}$ cm$^{-2}$ with the rotational temperature of 223.8$\pm$4.3 K. The estimated fractional abundance of C$_{2}$H$_{5}$CN with respect to H$_{2}$ towards G10.47+0.03 was 1.90$\times$10$^{-8}$. We observed that the estimated fractional abundance of C$_{2}$H$_{5}$CN is nearly similar to the simulated abundance of C$_{2}$H$_{5}$CN which was predicted by the three-phase warm-up model from Garrod (2013). We also discuss the possible formation mechanism of C$_{2}$H$_{5}$CN towards the hot molecular cores and we claimed the barrierless and exothermic radical-radical reaction between CH$_{2}$ and CH$_{2}$CN is responsible for the production of high abundant C$_{2}$H$_{5}$CN ($\sim$10$^{-8}$) towards G10.47+0.03 during the warm-up phases.Comment: 19 pages, 4 figure