Zoekopdracht:
journal id: "astrophysicalxjournal"
| Auteurs | T. di Salvo, R. Iaria, M. Mendez, L. Burderi, G. Lavagetto, N.R. Robba, L. Stella, M. van der Klis | | Titel | A Broad Iron Line in the Chandra High Energy Transmission Grating Spectrum of 4U 1705-44 |
| Tijdschrift | Astrophysical Journal |
| Jaargang | 623 |
| Jaar | 2005 |
| Nummer | nr.2 part 2 |
| Pagina's | L121-L124 |
| ISSN | 0004637X |
| Faculteit | Faculteit der Natuurwetenschappen, Wiskunde en Informatica |
| Instituut/afd. | FNWI: Astronomical Institute Anton Pannekoek (IAP) |
| Trefwoorden | accretion disks; neutron stars; X-ray binaries |
| Basisclassificatie | 39.22 astrofysica |
| Samenvatting | 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 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. |
| Opmerkingen | (c)1995 American Astronomical Society |
| Soort document | Artikel |
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