Can H2CCC be the Carrier of Broad Diffuse Bands?

Details Can H2CCC be the Carrier of Broad Diffuse Bands? Can H2CCC be the Carrier of Broad Diffuse Bands?

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...735..124k&link_type=abstract

The Astrophysical Journal, Volume 735, Issue 2, article id. 124 (2011).

Astronomy and Astrophysics

Astronomy

Ism: Molecules

Scientific paper

The recent assignment of two broad diffuse interstellar bands (DIBs) near 4882 and 5450 Å to the propadienylidene (l-C3H2) molecule is examined using a statistically meaningful sample of targets. Our spectra clearly show that the strength ratio of two broad DIBs is strongly variable, contrary to what should be observed if both features are due to l-C3H2, since the proposed transitions are lifetime broadened and start from the same level. Moreover, even in directions where the 4882 DIB and 5450 DIB are strong, the third expected l-C3H2 band, in the 5165-5185 Å region, is absent. Another puzzling characteristic of l-C3H2 as the proposed carrier of both broad diffuse bands is its column density of several 1014 cm-2, inferred from the equivalent width of the 5450 DIB. This value is one order of magnitude higher than N(CH) toward the same objects and two to three orders of magnitude higher than N(H2CCC), measured at radio frequencies in absorption, for comparable samples of the diffuse medium. We conclude that the proposed identification of broad DIBs is unjustified.
Based on observations collected at the European Organization for Astronomical Research in the Southern Hemisphere, Chile; programs 073.C-0337(A) and 082.C-0566(A).

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