Volume 511, February 2010
|Number of page(s)||4|
|Published online||26 February 2010|
Letter to the Editor
A coincidence between a hydrocarbon plasma absorption spectrum and the λ5450 DIB
Raymond and Beverly Sackler Laboratory for Astrophysics,
Leiden Observatory, Leiden University, PO Box 9513, 2300 RA
Leiden, The Netherlands e-mail: firstname.lastname@example.org
2 Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
3 Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200B, 3000 Leuven, Belgium
4 Physics and Astronomy Department, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
5 National Research Council of Canada, Herzberg Institute of Astrophysics, 5071 W. Saanich Road, Victoria, BC V9E 2E7, Canada
6 Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
7 Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
Accepted: 4 February 2010
Aims. The aim of this work is to link the broad λ5450 diffuse interstellar band (DIB) to a laboratory spectrum recorded through expanding acetylene plasma.
Methods. Cavity ring-down direct absorption spectra and astronomical observations of HD 183143 with the HERMES spectrograph on the Mercator Telescope on La Palma and the McKellar spectrograph on the DAO 1.2 m Telescope are compared.
Results. In the 543–547 nm region a broad band is measured with a band maximum at 545 nm and FWHM of 1.03(0.1) nm coinciding with a well-known diffuse interstellar band at λ5450 with an FWHM of 0.953 nm.
Conclusions. A coincidence is found between the laboratory and the two independent observational studies obtained at higher spectral resolution. This result is important, as a match between a laboratory spectrum and a – potentially lifetime broadened – DIB is found. A series of additional experiments were performed in order to unambiguously identify the laboratory carrier of this band, but this was not successful. The laboratory results, however, restrict the carrier to a molecular transient, consisting of carbon and hydrogen.
Key words: astrochemistry / techniques: spectroscopic / ISM: molecules / ISM: lines and bands
© ESO, 2010
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.