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 Title: A Sensitive Line Survey Of Tmc-1: The Chemical Complexity Of A Cold Dark Cloud Author(s): Cernicharo, Jose Contributor(s): Pardo, Juan R.; Marcelino, Nuria; de Vicente, Pablo; Tercero, Belén; Agúndez, Marcelino; Cabezas, Carlos Subject(s): Astronomy Abstract: We present a line survey of the cold dark core TMC-1 carried out with the YEBES 40m radio telescope in the Q-band. A new set of receivers have been installed in the telescope within the frame of the ERC synergy Nanocosmos project that allows to cover the whole 31-50 GHz band in dual polarization. The spectral resolution is 38.15 kHz. The sensitivity achieved so far varies between 0.3 and 1.5 mK, and allows to search for new molecules in a line by line (no stacking) detection procedure. These new data have permitted to detect the protonated species HC$_5$NH$^+$\footnote{Marcelino et al. 2020, A.\&A., 643, L6}, HC$_3$O$^+$\footnote{Cernicharo et al. 2020, A.\&A., 642, L17}, HC$_3$S$^+$\footnote{Cernicharo et al. 2021, A.\&A., 643, L3}, and CH$_3$CO$^+$\footnote{Cernicharo et al. 2021, A.\&A., 646, L7}. Each one of these species were detected first in TMC-1 by looking for unknown lines with harmonic frequency relations. All of them have been confirmed in the laboratory except HC$_5$NH$^+$, for which our identification is based in high-level of theory ab initio calculations. Neutral molecules with low permanent dipole moment such as CH$_2$CHCCH\footnote{Cernicharo et al. 2021, A.\&A., in press; 2021arXiv210210920C}, and CH$_2$CCHCCH\footnote{Cernicharo et al., 2021, A.\&A., in press} have been also detected with a very large abundance. In addition, nitrile anions such as C$_3$N$^-$ and C$_5$N$^-$ have been also detected confirming the previous assigment of C$_5$N$^-$ reported in the carbon-rich star IRC+10216 (Cernicharo et al. 2008, ApJ, 688, L83). Issue Date: 2021-06-22 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111517 Date Available in IDEALS: 2021-09-24
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