Fig. 3: The CN/H ratio as a function of the CN+aromatic rate coefficient, k.
From: Detections of interstellar aromatic nitriles 2-cyanopyrene and 4-cyanopyrene in TMC-1
a, The filled circles show ratios obtained from the astrochemical models for C9H7CN/C9H8 at different simulation ages. The isomer-specific CN/H ratio obtained at 0.2 Myr by taking 1/6 of the collision rate coefficient for the reaction of CN with indene (that is, 8.14 × 10−11 cm3 s−1) is shown by the purple diamond. The observed C9H7CN/C9H8 ratio is shown by the horizontal dashed line with uncertainties shown in the horizontal grey bar. The yellow-filled triangles show C6H5CN/C6H6 at 0.2 Myr as a function of the CN + C6H6 rate coefficient. b, Zoomed version of the area framed in grey in a.
