We report on the results from two BeppoSAX observations of the Z source GX 349+2 performed in February 2001 and covering the broad energy range 0.12–200 keV. The average spectrum is well described by a soft blackbody (kTBBnot, vert, similar0.5 keV) and a Comptonized component having a seed-photon temperature of kT0not, vert, similar1 keV, an electron temperature of kTenot, vert, similar2.7 keV, and optical depth τnot, vert, similar11. To well fit the energy spectrum three gaussian lines are needed at 1.2 keV, 2.6 keV, and 6.7 keV with corresponding equivalent widths of 13 eV, 10 eV, and 39 eV, probably associated to L-shell emission of Fe XXIV, Lyα S XVI, and Fe XXV, respectively. These lines may be produced at different distances from the neutron star, which increase when the count rate of the source increases. An absorption edge is also needed at 9 keV with an optical depth of not, vert, similar3×10−2. From the Color-Color Diagram (CD) we selected five zones from which we extracted the corresponding energy spectra.
A new BeppoSAX observation of the Z Source GX 349+2
FRONTERA, Filippo;
2004
Abstract
We report on the results from two BeppoSAX observations of the Z source GX 349+2 performed in February 2001 and covering the broad energy range 0.12–200 keV. The average spectrum is well described by a soft blackbody (kTBBnot, vert, similar0.5 keV) and a Comptonized component having a seed-photon temperature of kT0not, vert, similar1 keV, an electron temperature of kTenot, vert, similar2.7 keV, and optical depth τnot, vert, similar11. To well fit the energy spectrum three gaussian lines are needed at 1.2 keV, 2.6 keV, and 6.7 keV with corresponding equivalent widths of 13 eV, 10 eV, and 39 eV, probably associated to L-shell emission of Fe XXIV, Lyα S XVI, and Fe XXV, respectively. These lines may be produced at different distances from the neutron star, which increase when the count rate of the source increases. An absorption edge is also needed at 9 keV with an optical depth of not, vert, similar3×10−2. From the Color-Color Diagram (CD) we selected five zones from which we extracted the corresponding energy spectra.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
