Gamma-ray lines from interstellar grains | Zendy

R. E. Lingenfelter | Zendy; R. Ramaty | Zendy

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Gamma-ray lines from interstellar grains

Author(s) -

R. E. Lingenfelter,

R. Ramaty

Publication year - 1977

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/182334

Subject(s) - physics , interstellar medium , astrophysics , spectral line , line (geometry) , cosmic ray , gamma ray , radiation , astronomy , galaxy , optics , geometry , mathematics

The letter points out the existence of a hitherto unknown component of gamma-ray line emission: very narrow (FWHM less than 5 keV) lines from interstellar grains. The prime candidate for detection is the line at 6.129 MeV from O-16, but other very narrow lines could also be detected at 0.847, 1.369, 1.634, 1.779, and 2.313 MeV from Fe-56, Mg-24, Ne-20, Si-28, and N-14. Measurements of this line emission can provide information on the composition, size, and spatial distribution of interstellar grains.

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