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Discovery of a transient X-ray source Suzaku J1305-4930 in NGC 4945
Yoneyama, Tomokage; Hayashida, Kiyoshi; Matsumoto, Hironori +3 more
We report the serendipitous discovery of a transient X-ray source, Suzaku J1305-4930, ∼3 kpc southwest of the nucleus of the Seyfert 2 galaxy NGC 4945. Among the seven Suzaku observations of NGC 4945 from 2005 to 2011, Suzaku J1305-4930 was detected four times in July and August in 2010. The X-ray spectra are better approximated with a multi-color…
Discovery of recombining plasma associated with the candidate supernova remnant G189.6+3.3 with Suzaku
Nobukawa, Kumiko K.; Yamauchi, Shigeo; Pannuti, Thomas G. +1 more
We present the results of an X-ray spectral analysis of the northeast region of the candidate supernova remnant G189.6+3.3 with Suzaku. K-shell lines from highly ionized Ne, Mg, Si, and S were detected in the spectrum for the first time. In addition, a radiative recombining continuum (RRC) from He-like Si was clearly seen near 2.5 keV. This detect…
Discovery of annular X-ray emission centered on MAXI J1421-613: Dust-scattering X-rays?
Nobukawa, Masayoshi; Nobukawa, Kumiko K.; Yamauchi, Shigeo
We report the discovery of an annular emission of $\sim\!\! {3^{\prime }}\!-\!{9^{\prime }}$ radius around the center of a transient source, the X-ray burster MAXI J1421-613, in the Suzaku follow-up analysis. The spectrum of the annular emission shows no significant emission-line structure, and is well explained by an absorbed power-law model with…