Astrophys. J., Suppl. Ser., 237, 40-40 (2018/August-0)
A modern census of the broadest diffuse interstellar bands.
SONNENTRUCKER P., YORK B., HOBBS L.M., WELTY D.E., FRIEDMAN S.D., DAHLSTROM J., SNOW T.P. and YORK D.G.
Abstract (from CDS):
We present the results of a ground-based observing campaign designed to produce the first homogeneous census of the population of the broadest (FWHM >= 6 Å) diffuse interstellar bands (DIBs) in the Galaxy. New low-resolution optical spectra for 21 sightlines spanning a reddening range of three magnitudes, using stars of spectral types O7 through A3, were examined together with corresponding higher-resolution echelle spectra. A new pipeline developed for the reduction and analysis of the low-resolution spectra is presented. Of the 34 broad features reported in the literature, 22 are covered in this survey. Of those 22, 9 are confirmed as broad DIBs, 2 are rejected, and the remaining 11 are uncertain, due to severe blending with stellar and/or telluric lines. No new broad DIBs are identified. New homogeneous measurements of the strength of the broad 6177 Å DIB are compared with the corresponding strengths of five narrower DIBs known to trace different phases of the diffuse ISM: the 4963 Å C2-DIB (which can reside in diffuse molecular gas) and the 5780, 5797, 6284, and 6613 Å DIBs (which primarily trace atomic gas). The 6177 Å DIB correlates quite well with the 5780 and 6284 Å DIBs but shows no correlation with the 4963 Å C2-DIB-suggesting that its carrier is found primarily in the atomic gas.
© 2018. The American Astronomical Society. All rights reserved.
ISM: general - ISM: lines and bands - ISM: molecules - local interstellar matter
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