Abstract The spectral changes of hydrogenated amorphous carbon (HAC) could show variable distributions of solid carbon abundance in the interstellar medium (ISM). The variable optical properties of HAC analogs, produced by the laser ablation in a high vacuum, depends on the variation in its atomic and electronic structures. The fraction of hydrogen atoms in HAC increases proportionally with the laser’s power. The available solid carbon tied up in the interstellar HAC, being the carrier of the interstellar 3.4 μ m and 4.6 μ m−1 bands, is indicated by the strength of these bands. Comparing the strength of these bands with those of laboratory data indicates that the amount of carbon in HAC analogs is not inherently sufficient. The lack in the solid carbon (locked solid carbon) in these analogs can be analytically estimated to facilitate the simulation of cosmic carbon dust. The results show a reduction in the locked solid carbon when the fraction of hydrogen atoms in HAC analogs increases. When this fraction becomes approximately 0.52 relative to the total number of hydrogen and carbon atoms, there is no lack of carbon in HAC analogs. The interstellar distribution of variable solid carbon abundance is attributed to the modification of cosmic HAC, which occurs as a result of the variation in its hydrogen atom fraction and the UV processing taking place in the interstellar environments. This distribution reveals more solid carbon abundances reside in the dust phase and may assist in resolving the carbon crisis.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Hydrocarbon analogs of cosmic dust to trace the solid carbon abundance in the interstellar medium


    Beteiligte:

    Erschienen in:

    Advances in Space Research ; 55 , 2 ; 705-715


    Erscheinungsdatum :

    2014-10-17


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Space Irradiation of Interstellar Dust Analogs at Cryogenic Temperatures

    Greenberg, J. M. / Schutte, W. A. / Li, A. et al. | British Library Conference Proceedings | 1999


    The Abundance of Water Vapour in the Interstellar Medium

    Cernicharo, J. | British Library Online Contents | 1997


    Interstellar dust models

    Désert, F.X. | Elsevier | 1993


    Interstellar Dust Models

    Desert, F. X. / COSPAR | British Library Conference Proceedings | 1993