[PPS09-P01] Analysis of Interstellar Infrared Spectrum by Hydrocarbon and Pure Carbon Molecules
Keywords:interstellar dust, infrared spectrum, PAH
Result-1, Hydrocarbon molecule
Starting molecule was coronene (C24H12). By a void creation and photoionization, coronene transformed to cationic PAH (C23H12)n+. Comparing with ubiquitouly well observed spectrum and calculated one of di-cation (C23H12)2+, we could find very good coincidence as follows (1).
Observed wavelength (micrometer): 3.3, 6.2, 7.7, 8.6, 11.2, 12.7
Calculated wavelength(micrometer): 3.2, 6.3, 7.7, 8.6, 11.2, 12.7
Result-2, Pure carbon molecule
Recently, unusual spectrum was observed in NGC1316 and NGC4589 (2). There are no clear distinct peaks in shorter wavelength. Cause of shorter wavelength band is C-H stretching mode. It is reasonable that molecule may have no hydrogen, that is, may be dehydrogenated. Pure carbon cationic molecules should be calculated. Result of di-cation (C23)2+ show best coincidence as follows (3).
Observed wavelength (micrometer) : 11.3, 12.8, 14.0, 15.6, 17.2, 19.0
Calculated wavelength (micrometer):11.3, 13.0, 14.0, 15.6, 17.0, 19.0
We could explain variation of observed spectrum by a combination of above mentioned hydrocarbon and pure carbon molecules.
(1) Norio Ota, arXiv.org 1703.05931 (2017)
(2) B. Asabere et al, arXiv.org 1605.07651 (2016)
(3) Norio Ota, arXiv.org 1708.08043 (2017)