Query : 2023A&A...671A..89L

2023A&A...671A..89L - Astronomy and Astrophysics, volume 671A, 89 (2023/3-1)

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


Abstract (from CDS):

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 Cn (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.

Abstract Copyright: © The Authors 2023

Journal keyword(s): infrared: ISM - molecular processes - methods: numerical - ISM: abundances - ISM: molecules - ISM: lines and bands

Simbad objects: 6

goto Full paper

goto View the references in ADS

Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 LIN 49 PN 00 43 53.887 -72 55 14.79   16.3 17.1 16.7 16.91 ~ 19 0
2 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1395 1
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 878 0
4 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 635 1
5 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 704 0
6 HD 200775 Ae* 21 01 36.9205762896 +68 09 47.789578836 7.34 7.754 7.427 8.13   B2Ve 558 0

To bookmark this query, right click on this link: simbad:objects in 2023A&A...671A..89L and select 'bookmark this link' or equivalent in the popup menu