Resolving the Fe XXV triplet with Chandra in Centaurus X-3

Natale Robba, Tiziana Di Salvo, Rosario Iaria, Burderi, Giuseppe Lavagetto

Risultato della ricerca: Articlepeer review

12 Citazioni (Scopus)

Abstract

We present the results of a 45 ks Chandra observation of the high-mass X-ray binary Cen X-3 at orbital phases between 0.13 and 0.40 (in the eclipse post-egress phases). Here we concentrate on the study of discrete features in the energy spectrum at energies between 6 and 7 keV, that is, on the iron K alpha line region, using the High Energy Transmission Grating Spectrometer (HETGS) on board the Chandra satellite. We clearly see a K alpha neutral iron line at similar to 6.40 keV and were able to distinguish the three lines of the Fe xxv triplet at 6.61, 6.67, and 6.72 keV, with equivalent widths of 6, 9, and 5 eV, respectively. The equivalent width of the Ka neutral iron line is 13 eV, an order of magnitude lower than previous measures. We discuss the possibility that the small equivalent width is due to a decrease of the solid angle subtended by the reflector.
Lingua originaleEnglish
pagine (da-a)L161-L164
Numero di pagine4
RivistaTHE ASTROPHYSICAL JOURNAL
Volume634
Stato di pubblicazionePublished - 2005

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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