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AuthorsT. di Salvo, R. Iaria, M. Mendez, L. Burderi, G. Lavagetto, N.R. Robba, L. Stella, M. van der Klis
TitleA Broad Iron Line in the Chandra High Energy Transmission Grating Spectrum of 4U 1705-44
JournalAstrophysical Journal
Volume623
Year2005
Issuenr.2 part 2
PagesL121-L124
ISSN0004637X
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
Keywordsaccretion disks; neutron stars; X-ray binaries
Classification39.22 astrofysica
AbstractWe 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 Kalpha 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 Lyalpha 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 Kalpha 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.
Note(c)1995 American Astronomical Society
Document typeArticle
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