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18 April 2024 |
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SAX J1810.8-2609: A New Hard X-ray Bursting Transient | | L. Natalucci
; A. Bazzano
; M. Cocchi
; P. Ubertini
; J. Heise
; E. Kuulkers
; J.J.M. in ’t Zand
; M.J.S. Smith
; | | Date: |
25 Dec 1999 | | Subject: | astro-ph | | Abstract: | The transient X-ray source SAX J1810.8-2609 was discovered on 1998, March 10 with the Wide Field Cameras on board the BeppoSAX satellite, while observing the Galactic Bulge in the 2-28 keV energy range. On March 11, a strong type-I X-ray burst was detected with evidence of photospheric radius expansion. A follow-up target of opportunity observation with the Narrow-Field Instruments (NFI) was performed on March 11 and 12, for a total elapsed time of 8.51 x 10^{4} s. The wide band spectral data (0.1-200 keV) obtained with the NFI show a remarkable hard X-ray spectrum detected up to ~200 keV, which can be described by a power law with photon spectral index Gamma=1.96pm0.04, plus a soft component which is compatible with blackbody radiation of temperature kT~0.5 keV. The detection of the type-I X-ray burst is a strong indication that the compact object is a neutron star in a low mass X-ray binary system. Assuming standard burst parameters and attributing the photospheric radius expansion to near Eddington luminosity, we estimate a distance of ~5 kpc. The inferred 2-10 keV X-ray luminosity is ~ 9 x 10^{35} erg/s at the time of the discovery. | | Source: | arXiv, astro-ph/0001437 | | Services: | Forum | Review | PDF | Favorites | |
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