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AuthorsR. Iaria, M. Spano, T. di Salvo, N.R. Robba, L. Burderi, R.P. Fender, M. van der Klis, F. Frontera
TitleOn the Soft Excess in the X-Ray Spectrum of Circinus X-1: Revisitation of the Distance to Circinus X-1
JournalAstrophysical Journal
Volume619
Year2005
Issuenr.1 part 1
Pages503-516
ISSN0004637X
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
Keywordsaccretion disks; neutron stars; X-ray binaries
Classification39.22 astrofysica
AbstractWe report on a 300 ks BeppoSAX (0.12-200 keV) observation of Circinus X-1 (Cir X-1) at phases between 0.62 and 0.84 and on a 90 ks BeppoSAX observation of Cir X-1 at phases 0.11-0.16. Using the canonical model adopted until now to fit the energy spectrum of this source, large residuals appear below 1 keV. These are well fitted using an equivalent hydrogen column of 0.66?10<SUP>22</SUP> cm<SUP>-2</SUP>, adding absorption edges of O VII, O VIII, and Ne IX in the spectra extracted from the observation at phases 0.62-0.84 and adding absorption edges of O VII, O VIII, Mg XI, and Mg XII and absorption lines of O VIII and Mg XII in the spectra extracted from the observation at phases 0.11-0.16. During the observation at phases 0.62-0.84 the electron density associated with the ionized matter is ~10<SUP>13</SUP> cm<SUP>-3</SUP>, remaining quite constant going away from the compact object. During the observation at phases 0.11-0.16, the electron density profile varies along the distance going from ~6?10<SUP>13</SUP> cm<SUP>-3</SUP> at ~10<SUP>11</SUP> cm to ~9?10<SUP>10</SUP> cm<SUP>-3</SUP> at ~10<SUP>13</SUP> cm. The equivalent hydrogen column toward Cir X-1 is 3 times lower than the value obtained from previous models. This low value would imply that Cir X-1 is at a distance of 4.1 kpc.
Note(c)1995 American Astronomical Society
Document typeArticle
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