Discoveries of 3 K-Shell Lines of Iron and a Coherent Pulsation of 593s from SAX J1748.2-2808
Koyama, Katsuji; Matsumoto, Hironori; Nobukawa, Masayoshi; Tsuru, Takeshi Go
Japan
Abstract
SAX J1748.2-2808 is a unique X-ray object with a flat spectrum and strong emission lines at 6.4--7.0keV. The Suzaku satellite resolved the emission lines into 3 K-shell lines from neutral and highly ionized irons. A clear coherent pulsation with a period of 593s was found from the Suzaku and XMM-Newton archives. These facts favor that SAX J1748.2-2808 is an intermediate polar, a subclass of a magnetized white dwarf binary (cataclysmic variable). This paper reports on details of the findings, and discusses the origin of this source.