A BROAD IRON LINE IN THE CHANDRA HIGH ENERGY TRANSMISSION GRATING SPECTRUM OF 4U 1705-44

摘要

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 Ka 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.