Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431002j&link_type=abstract
American Astronomical Society, AAS Meeting #214, #310.02; Bulletin of the American Astronomical Society, Vol. 41, p.745
Astronomy and Astrophysics
Astronomy
Scientific paper
Diffuse Interstellar Bands: A Combined Laboratory-Astronomical Study
Abstract
A comprehensive exposition of accumulated experimental laboratory and astronomical spectroscopic DIB data implicates the following molecules: (1) the ultra-thermodynamically stable metal-organic molecule magnesium-tetrabenzoporphyrin (MgTBP) situated within (2) a paraffin matrix (referred to as either grains or dust), and (3) a low concentration of pyridine (also within the grains) whose transmission window at 2175 Å accounts for the ubiquitous UV bump. It is proposed that pyridine coordinates to MgTBP to produce the species responsible for the DIB features. The strongest DIB at 4428.19Å is matched precisely with the most prominent laboratory-measured absorption Soret band of MgTBP at 4428.2Å, including its FWHM value; likewise the next strongest DIB at 6284Å correlates with the MgTBP Q band. Over 27 DIBs are matched with low-temperature laboratory Shploskii data of MgTBP in such matrices, to a precision of 1Å.
The most recent DIB catalog using HD204827 is provided by L. M. Hobbs et al. (ApJ 680,1256-1270,2008). This catalog lists weak, narrow DIBs consistent with laboratory Shpolskii spectral data. The DIB-laboratory correlations include minimum linewidths and evidence of crystal electric field effects that act to remove the degeneracy of MgTBP's first and second electronic states resulting in a clear display of vibronic spectral bands whose interpretation is now possible using the published complete vibrational data set of MgTBP (see F. M. Johnson Spectrochimica Acta Part A 65 (2006) 1154-1179.)
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