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001-es BibID:	BIBFORM102741
035-os BibID:	(Wos)000460814000017 (Scopus)85063485972
Első szerző:	Gall, Amy C.
Cím:	EBIT Observation of Ar Dielectronic Recombination Lines near the Unknown Faint X-Ray Feature Found in the Stacked Spectrum of Galaxy Clusters / Gall, Amy C., Foster Adam R., Silwal, Roshani, Dreiling, Joan M., Borovik, Alexander, Kilgore, Ethan, Ajello, Marco, Gillaspy, John D., Ralchenko, Yuri, Takács, Endre
Dátum:	2019
ISSN:	1538-4357
Megjegyzések:	Motivated by possible atomic origins of the unidentified emission line detected at 3.55?3.57 keV in a stacked spectrum of galaxy clusters, an electron beam ion trap (EBIT) was used to investigate the resonant dielectronic recombination (DR) process in highly charged argon ions as a possible contributor to the emission feature. The He-like Ar DR-induced transition 1s2 2l?1s2l3l· was suggested to produce a 3.62 keV photon near the unidentified line at 3.57 keV and was the starting point of our investigation. The collisional-radiative model NOMAD was used to create synthetic spectra for comparison with both our EBIT measurements and with spectra produced with the AtomDB database/Astrophysical Plasma Emission Code (APEC) used in the Bulbul et al. work. Excellent agreement was found between the NOMAD and EBIT spectra, providing a high level of confidence in the atomic data used. Comparison of the NOMAD and APEC spectra revealed a number of missing features in the AtomDB database near the unidentified line. At an electron temperature of Te = 1.72 keV, the inclusion of the missing lines in AtomDB increases the total flux in the 3.5?3.66 keV energy band by a factor of 2. While important, this extra emission is not enough to explain the unidentified line found in the galaxy cluster spectra.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk atomic processesline: identificationmethods: laboratory: atomictechniques: spectroscopicX-rays: galaxies: clusters
Megjelenés:	The Astrophysical Journal. - 872 : 2 (2019), p. 194-202. -
További szerzők:	Foster, Adam R. Silwal, Roshani Dreiling, Joan M. Borovik, Alexander Kilgore, Ethan Ajello, Marco Gillaspy, John Dale Ralchenko, Yuri Takács Endre (1965-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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