Assignment of 5069 Å diffuse interstellar band to HC(4)H(+): disagreement with laboratory absorption band

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DOIResolve DOI: http://doi.org/10.1088/2041-8205/729/2/L20
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TypeArticle
Journal titleAstrophysical journal letters
Volume729
Issue2
Pages14; # of pages: 4
SubjectISM: general; ISM: lines and bands; ISM: molecules; methods: laboratory; techniques: spectroscopic
AbstractKrelowski et al. have reported a weak, diffuse interstellar band (DIB) at 5069 angstrom which appears to match in both mid-wavelength and width the A(2)Pi(u)-X(2)Pi(g) gas-phase origin absorption band of HC(4)H(+). Here, we present laboratory rotational profiles at low temperatures which are then compared with the 5069 angstrom DIB using similar to 0.1 and 0.3 angstrom line widths based on a realistic line-of-sight interstellar velocity dispersion. Neither the band shape nor the wavelength of the maximum absorption match, which makes the association of the 5069 angstrom DIB with HC(4)H(+) unlikely. The magnetic dipole transition X(2)Pi(g)Omega = 1/2 -> X(2)Pi(g)Omega = 3/2 within the ground electronic state which competes with collisional excitation is also considered. In addition, we present the laboratory gas-phase spectrum of the A(2)Pi(u)-X(2)Pi(g) transition of HC(4)H(+) measured at 25 K in an ion trap and identify further absorption bands at shorter wavelengths for comparison with future DIB data.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number19734693
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Record identifier75208aec-a601-483b-8550-720b37c4e940
Record created2012-03-28
Record modified2016-05-09
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