Hubble Space Telescope observations of C2 molecules in diffuse interstellar clouds

Details Hubble Space Telescope observations of C2 molecules in diffuse interstellar clouds Hubble Space Telescope observations of C2 molecules in diffuse interstellar clouds

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...438..740l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 438, no. 2, p. 740-749

Other

57

Carbon, Hubble Space Telescope, Interstellar Matter, Molecular Clouds, Molecules, Abundance, Astronomical Spectroscopy, Spectrum Analysis

Scientific paper

Interstellar C2 F-X (1342 A) and D-X (2313 A) bands in the spectrum of zeta Oph were detected using the Goddard High-Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST). The total C2 column density is (1.79 +/- 0.06) 1013/sq cm for an adopted f-value of 0.0545 for the 2313 A band of the Mulliken (D-X) system. Relative f-values for the 0-0 F-X, 0-0 D-X, and 2-0 A-X (Phillips) bands are derived by combining ultraviolet and near-infrared spectra: f00FX/f00DX = 1.83 +/- 0.18 and f20AX/f00DX = 0.0226 +/- 0.0029. For the Mulliken system, lines are detected up to a rotational level J double prime = 24. The relative populations along the rotational ladder are shown to be consistent with the physical and environmental conditions suggested by other diagnostics. Interstellar C2 molecules were detected towards zeta Per (N(C2) = (0.80 +/- 0.23) 1013) but not towards Beta1, pi, and omega1 Sco(N(C2) less than or equal to 0.17 x 1013/sq cm.

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