Volume 656, December 2021
|Number of page(s)||6|
|Section||Letters to the Editor|
|Published online||10 December 2021|
Letter to the Editor
C60+ diffuse interstellar band correlations and environmental variations
Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
2 ILEWG EMMESI EuroMoonMars Earth Space Innovation, Leiden Observatory, Universiteit Leiden, Huygens Laboratory, J.H. Oort Building, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
3 Department of Physics and Astronomy, The University of Western Ontario, London, ON N6A 3K7, Canada
4 Institute for Earth and Space Exploration, The University of Western Ontario, London, ON N6A 3K7, Canada
5 SETI Institute, 189 Bernardo Ave, Suite 100, Mountain View, CA 94043, USA
Accepted: 25 November 2021
Context. The diffuse interstellar bands (DIBs) are absorption features seen in the spectra of astronomical objects that arise in the interstellar medium. Today, more than 500 DIBs have been observed, mostly in the optical and near-infrared wavelengths. The origin of the DIBs is unclear; only ionised buckminsterfullerene, C60+, has been identified as a viable candidate for two strong and three weaker DIBs.
Aims. We investigate the correlations between the strengths of the two strongest C60+ DIBs as well as their environmental behaviour.
Methods. We analysed measurements of the strengths of the two C60+ DIBs at 9577 and 9633 Å for 26 lines of sight. We used two different methods, including Monte Carlo simulations, to study their correlations and the influence of measurement errors on the correlation coefficients. We examined how the strength of the C60+ DIBs changes as a result of different environmental conditions, as measured by the concentration of H/H2 and the strength of the ambient UV radiation.
Results. In contrast to results recently reported by Galazutdinov et al. (2021, AJ, 161, 127), we find a high correlation between the strengths of the C60+ DIBs. We also discovered that the behaviour of the correlated C60+ bands is quite distinct from other DIBs at 5780, 5797, and 6203 Å in different environments.
Key words: ISM: lines and bands / ISM: molecules / ISM: clouds / dust, extinction
© ESO 2021
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.