Search Publications
X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku
Fabian, Andrew C.; Takahashi, Tadayuki; Yamauchi, Makoto +13 more
We report on results from a Suzaku observation of the narrow-line Seyfert 1 NGC 4051. During our observation, large-amplitude rapid variability was seen, and the averaged 2--10keV flux was 8.1×10-12erg s-1cm-2, which is several times lower than the historical average. The X-ray spectrum hardens when the source flux…
Super-Hard X-Ray Emission from η Carinae Observed with Suzaku
Hamaguchi, Kenji; Ishida, Manabu; Tsujimoto, Masahiro +4 more
We present the Suzaku results of η Carinae in the 5-50keV range conducted twice around the apastron in 2005 August for 50ks and in 2006 February for 20ks. The X-ray Imaging Spectrometer (XIS) produced hard (5-12keV) band spectra, resolving K shell lines from highly ionized Fe and Ni. The Hard X-ray Detector yielded a significant detection in the s…
Uniting the Quiescent Emission and Burst Spectra of Magnetar Candidates
Yamaoka, Kazutaka; Nakagawa, Yujin E.; Yoshida, Atsumasa +1 more
Spectral studies of quiescent emission and bursts of magnetar candidates based on XMM-Newton, Chandra, and Swift data are presented. Spectra of both the quiescent emission and the burst for most magnetar candidates are reproduced by a photoelectrically absorbed two-blackbody function (2BB). There is a strong correlation between the lower and highe…