Abstract

Abstract We present Suzaku results of an X-ray source, AX J185905 $+$ 0333, discovered in the ASCA galactic plane survey. The radial profile of AX J185905 $+$ 0333 is larger than that of the point-spread function. No intensity variation was found during the observation. These facts indicate that AX J185905 $+$ 0333 is an extended source. A large low-energy absorption, equivalent to $N_{\rm H}$ of (8–10) $\times$ 10 $^{22}\ $ cm $^{-2}$ , was found, which supports that AX J185905 $+$ 0333 is an extragalactic object behind the galactic plane. The X-ray spectrum exhibits a clear emission line at 4.82 keV, and is represented by a thin-thermal plasma model of 6.6 keV temperature with a redshift of 0.391. Then, the X-ray luminosity was calculated to be 2.7 $\times$ 10 $^{45}\ $ erg s $^{-1}$ . These results strongly support that AX J185905 $+$ 0333 is an X-ray luminous cluster of galaxies behind the galactic plane.

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