Correlation between UV resilience and wavelength of narrow DIBs
arXiv:2003.12118 · doi:10.1051/0004-6361/201937071
Abstract
Carriers of diffuse interstellar bands (DIBs) still need to be identified. In a recent paper, we reported a correlation between the DIB wavelength and the apparent UV resilience (or boost) of their carriers. We proposed that this might be an indication of the important role of conjugated elongated molecules among the DIB carriers. The aim of this paper is to further understand the origin of this correlation. The analysis of 509 optical DIBs on the lines of sight of HD 183143 and/or HD 204827 reported in the literature shows that this correlation mainly implies the 386 narrow DIBs with a band width < 1.1 A, which include most of the identified DIBs of the C2 and zeta families, while the majority of the 123 broader DIBs, including the identified sigma DIBs, do not display such a correlation. We present a possible origin of this correlation from very strong bands of large conjugated elongated molecules, such as carbon chains, polyacenes, or other catacondensed polycyclic aromatic hydrocarbons. The total amount of carbon contained in all the carriers of these narrow DIBs is a very small fraction of the interstellar carbon if their oscillator strengths are <~1. The amount of carbon locked in the carriers of the broader DIBs is higher, especially if their oscillator strengths are significantly weaker.
References in corpus (17)
- A Catalog of Diffuse Interstellar Bands in the Spectrum of HD 204827
- The Diffuse Interstellar Bands: A Major Problem in Astronomical Spectroscopy
- Studies of the Diffuse Interstellar Bands. III. HD 183143
- Time-dependent density functional study of the electronic spectra of oligoacenes in the charge states -1, 0, +1, and +2
- VLT/X-shooter survey of near-infrared diffuse interstellar bands
- Electronic Properties of Cyclacenes from TAO-DFT
- On-Surface Hydrogen-Induced Covalent Coupling of Polycyclic Aromatic Hydrocarbons via a Superhydrogenated Intermediate
- H2 formation on PAHs in photodissociation regions: a high-temperature pathway to molecular hydrogen
- Diffuse Interstellar Bands vs. Known Atomic and Molecular Species in the Interstellar Medium of M82 toward SN 2014J
- The Gaia-ESO Survey: Extracting diffuse interstellar bands from cool star spectra, DIB-based interstellar medium line-of-sight structures at the kpc scale
- Near-infrared diffuse interstellar bands in 0.91-1.32 micron
- Polyacenes and diffuse interstellar bands
- A Principal component analysis of the diffuse interstellar bands
- The Behavior of Selected Diffuse Interstellar Bands with Molecular Fraction in Diffuse Atomic and Molecular Clouds
- Abundances and rotational temperatures of the C2 interstellar molecule towards six reddened early-type stars
- Statistical universal branching ratios for cosmic ray dissociation, photodissociation, and dissociative recombination of the C(n=2-10), C(n=2-4)H and C3H2 neutral and cationic species
- The 15273 Å diffuse interstellar band in the dark cloud Barnard 68