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- W4386043923 abstract "We report the first detection of SiC$_2$ in the interstellar medium. The molecule was identified through six rotational transitions toward G,+0.693$-$0.027, a molecular cloud located in the Galactic center. The detection is based on a line survey carried out with the GBT, the Yebes 40m, and the IRAM 30m telescopes covering a range of frequencies from 12 to 276 GHz. We fit the observed spectra assuming local thermodynamic equilibrium and derive a column density of ($1.02pm0.04)times10^{13}$ cm$^{-2}$, which gives a fractional abundance of $7.5times10^{-11}$ with respect to H$_2$, and an excitation temperature of $5.9pm0.2$ K. We conclude that SiC$_2$ can be formed in the shocked gas by a reaction between the sputtered atomic silicon and C$_2$H$_2$, or it can be released directly from the dust grains due to disruption. We also search for other Si-bearing molecules and detect eight rotational transitions of SiS and four transitions of Si$^{18}$O. The derived fractional abundances are $3.9times10^{-10}$ and $2.1times10^{-11}$, respectively. All Si-bearing species toward G,+0.693$-$0.027 show fractional abundances well below what is typically found in late-type evolved stars." @default.
- W4386043923 created "2023-08-22" @default.
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- W4386043923 date "2023-08-18" @default.
- W4386043923 modified "2023-10-18" @default.
- W4386043923 title "The first detection of SiC$_2$ in the interstellar medium" @default.
- W4386043923 doi "https://doi.org/10.1051/0004-6361/202346822" @default.
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