Naslov
Tetrahedral hydrocarbon nanoparticles in space: X-ray spectra

Autori
Bilalbegović, Goranka ; Maksimović, Aleksandar ; Valencic, Lynne

Izvornik
Monthly notices of the Royal Astronomical Society (0035-8711) 476 (2018), 4; 5358-5364

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
astrochemistry, ISM: molecules, methods: numerical, X-rays: individuals: V892 Tau, HD 97048, Cyg X-2, X-rays: ISM, galaxies: active

Sažetak
It has been proposed, or confirmed, that diamond nanoparticles exist in various environments in space: close to active galactic nuclei, in the vicinity of supernovae and pulsars, in the interior of several planets in the Solar system, in carbon planets and other exoplanets, carbon-rich stars, meteorites, in X-ray active Herbig Ae/Be stars, and in the interstellar medium. Using density functional theory methods we calculate the carbon K-edge X-ray absorption spectrum of two large tetrahedral nanodiamonds: C26H32 and C51H52. We also study and test our methods on the astrophysical molecule CH4, the smallest C-H tetrahedral structure. A possible detection of nanodiamonds from X-ray spectra by future telescopes, such as the project Arcus, is proposed. Simulated spectra of the diffuse interstellar medium using Cyg X-2 as a source show that nanodiamonds studied in this work can be detected by Arcus, a high resolution X-ray spectrometer mission selected by NASA for a Phase A concept study.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA