Fig. 6.
Column density of C4H represented as a function of the column density of CH3OH (left panel), HCOOCH3 (middle panel), and CH3OCH3 (right panel) in various starless/prestellar cores, Class 0 sources, and hot corinos. All column densities are beam-averaged values obtained with single-dish telescopes. See references in the caption of Fig. 5 for the column densities of C4H and CH3OH in TMC-1, L1544, B1-b, and L1527. Column densities of HCOOCH3 and CH3OCH3 are taken from Marcelino et al. (in preparation) for TMC-1 (upper limits), Jiménez-Serra et al. (2016) for L1544, Cernicharo et al. (2012) for B1-b, and Yoshida et al. (2019) for L1527 (upper limits). For the three hot corino sources, column densities for C4H are from Sakai et al. (2009a), for CH3OH from Maret et al. (2005), and for HCOOCH3 and CH3OCH3 from Cazaux et al. (2003) (values have been averaged for a 10″ source size) and from Bottinelli et al. (2007).