A complete 3mm line survey of the B1-b and TMC-1 cores

New discoveries with the IRAM 30m and Yebes 40m telescopes

¹ Observatorio Astronómico Nacional, IGN, C/Alfonso XII 3, 28014 Madrid, Spain
² Observatorio de Yebes, IGN, Cerro de la Palera s/n, 19141 Yebes, Guadalajara, Spain
³ Instituto de Física Fundamental, CSIC, C/Serrano 123, 28006 Madrid, Spain

^* e-mail: n.marcelino@oan.es

Published online: 7 September 2022

Abstract

We present the 3mm spectral line survey performed at the IRAM 30m telescope towards the dense cores B1-b and TMC-1. Within the 46 GHz observed, we have identified more than 500 lines arising from more than 60 molecules. We have also detected tens of unidentified lines, allowing the discovery of new molecular species in space. In this contribution we discuss two examples: the case of H₂NC and CH₃CO⁺. In the latter, the 30m data was used in combination with the 7mm survey data from the Yebes 40m telescope, which provides lower energy transitions. Our deep 3mm and 7mm spectral surveys reveal a forest of lines at 50-100 mK, showing that dark clouds cannot be considered poor line sources anymore.