Broadband Observations of the Transient X-ray Pulsar SAX J2103.5+4545
Sunyaev, R. A.; Lutovinov, A. A.; Revnivtsev, M. G.; Burenin, R. A.; Pavlinsky, M. N.; Filippova, E. V.; Shtykovsky, P. E.; Arefiev, V. A.
Russia, Germany
Abstract
We investigated the optical, X-ray, and gamma-ray variability of the pulsar SAX J2103.5+4545. Our timing and spectral analyses of the X-ray and gamma-ray emissions from the source using RXTE and INTEGRAL data show that the shape of its spectrum in the energy range 3-100 keV is virtually independent of its intensity and the orbital phase. Based on XMM-Newton data, we accurately (5 arcsec) localized the object and determined the optical counterpart in the binary. We placed upper limits on the variability of the latter in the H_alpha line on time scales of the orbital and pulse periods, respectively.