A Broad Iron Line in the Chandra High Energy Transmission Grating Spectrum of 4U 1705-44

Natale Robba, Tiziana Di Salvo, Rosario Iaria, Van Der Klis, Burderi, Stella, Méndez, Giuseppe Lavagetto

Risultato della ricerca: Articlepeer review

34 Citazioni (Scopus)

Abstract

We present the results of a Chandra 30 ks observation of the low-mass X-ray binary and atoll source 4U 1705-44. Here we concentrate on the study of discrete features in the energy spectrum at energies below ~3 keV, as well as on the iron Kα line, using the High Energy Transmission Grating Spectrometer on board the Chandra satellite. Below 3 keV, three narrow emission lines are found at 1.47, 2.0, and 2.6 keV. The 1.47 and 2.6 keV lines are probably identified with Lyα emission from Mg XII and S XVI, respectively. The identification of the feature at ~2.0 keV is uncertain because of the presence of an instrumental feature at the same energy. The iron Kα line at ~6.5 keV is found to be intrinsically broad (FWHM~1.2 keV); its width can be explained by reflection from a cold accretion disk extending down to ~15 km from the neutron star center or by Compton broadening in the external parts of a hot (~2 keV) Comptonizing corona. We finally report here precise X-ray coordinates of the source.
Lingua originaleEnglish
pagine (da-a)L121-L124
Numero di pagine4
RivistaTHE ASTROPHYSICAL JOURNAL
Volume623
Stato di pubblicazionePublished - 2005

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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