A plausible molecular mechanism to explain near-infrared continuum emission: Recurrent fluorescence

¹ Institut des Sciences Moléculaires d’Orsay (ISMO), Université Paris-Saclay, CNRS, 598 rue André Rivière, 91405 Orsay, France
e-mail: ozan.lacinbala@universite-paris-saclay.fr; thomas.pino@universite-paris-saclay.fr
² Université Grenoble-Alpes, CNRS, LIPhy, 140 rue de la Physique, 38000 Grenoble, France
³ Laboratoire de Chimie et Physique Quantiques (LCPQ), Fédération FeRMI, Université de Toulouse, CNRS, 118 route de Narbonne, 31062 Toulouse, France

Received: 9 November 2022
Accepted: 22 December 2022

Abstract

Context. Very small grains and large hydrocarbon molecules are known to convert a fraction of the ultraviolet (UV) and visible stellar radiation to near- and mid-infrared (IR) photons via stochastic heating and subsequent radiative de-excitation. However, no convincing explanation for the near-IR continuum emission observed in some reflection nebulae and planetary nebulae has been provided so far.

Aims. We aim to investigate the extent that recurrent fluorescence originating from stellar photon absorption by C_n (n = 24, 42, 60) carbon clusters can account for the IR emission detected in various interstellar environments. To this aim, we modelled the collective emission signature of a carbon cluster sample induced by irradiation from a 20 000 K blackbody source. From the obtained results, we set out to determine the fraction of interstellar carbon locked up in the emitting objects.

Methods. The collective emission signature was computationally determined for different structural families encompassing cages, flakes, pretzels, and branched isomers by means of a kinetic Monte Carlo stochastic approach based on harmonic vibrational densities of states. The collective emission spectra result from the overall radiative cooling of a large population of neutral carbon clusters, during which recurrent fluorescence and vibrational emission compete with each other.

Results. Our modelling shows that recurrent fluorescence from C₆₀ cages and flakes (with little or no sp¹ carbon atoms) and C₄₂ cages are able to explain the near-IR continuum emission observed in several reflection nebulae and planetary nebulae. Assuming that the continuum emission observed towards NGC 7023 is due to recurrent fluorescence induced by UV or visible photon absorption in neutral cage carbon clusters containing about 30–60 atoms, the carriers contain about 0.1–1.5% of the interstellar carbon abundance.