Search Publications
Suzaku observations of the merging galaxy cluster Abell 2255: The northeast radio relic
Zhang, Y. -Y.; Kaastra, J. S.; Fukazawa, Y. +12 more
We present the results of deep 140 ks Suzaku X-ray observations of the north-east (NE) radio relic of the merging galaxy cluster Abell 2255. The temperature structure of Abell 2255 is measured out to 0.9 times the virial radius (1.9 Mpc) in the NE direction for the first time. The Suzaku temperature map of the central region suggests a complex tem…
Properties of the cosmological filament between two clusters: A possible detection of a large-scale accretion shock by Suzaku
Kaastra, J. S.; Mernier, F.; Ishisaki, Y. +7 more
We report on the results of a Suzaku observation of the plasma in the filament located between the two massive clusters of galaxies, Abell 399 and Abell 401. Abell 399 (z = 0.0724) and Abell 401 (z = 0.0737) are expected to be in the initial phase of a cluster merger. In the region between the two clusters, we find a clear enhancement in the tempe…
SNR 1E 0102.2-7219 as an X-ray calibration standard in the 0.5-1.0 keV bandpass and its application to the CCD instruments aboard Chandra, Suzaku, Swift and XMM-Newton
Miller, Eric D.; Haberl, Frank; Plucinsky, Paul P. +4 more
Context. The flight calibration of the spectral response of charge-coupled device (CCD) instruments below 1.5 keV is difficult in general because of the lack of strong lines in the on-board calibration sources typically available. This calibration is also a function of time due to the effects of radiation damage on the CCDs and/or the accumulation…
A Suzaku, NuSTAR, and XMM-Newton view on variable absorption and relativistic reflection in NGC 4151
Dauser, T.; Wilms, J.; Kadler, M. +6 more
We disentangle X-ray disk reflection from complex line-of-sight absorption in the nearby Seyfert NGC 4151, using a suite of Suzaku, NuSTAR, and XMM-Newton observations. Extending upon earlier published work, we pursue a physically motivated model using the latest angle-resolved version of the lamp-post geometry reflection model relxillCp_lp togeth…
BL Lacertae: X-ray spectral evolution and a black-hole mass estimate
Titarchuk, Lev; Seifina, Elena
We present an analysis of the spectral properties observed in X-rays from active galactic nucleus BL Lacertae using RXTE, Suzaku, ASCA, BeppoSAX, and Swift observations. The total time covered by these observations is approximately 20 yr. We show strong observational evidence that this source undergoes X-ray spectral transitions from the low hard …
Discovery of a 26.2 day period in the long-term X-ray light curve of SXP 1323: a very short orbital period for a long spin period pulsar
Haberl, F.; Sturm, R.; Carpano, S.
Context. About 120 Be/X-ray binaries (BeXBs) are known in the Small Magellanic Cloud (SMC); about half of them are pulsating with periods from a few to hundreds of seconds. SXP 1323 is one of the longest-period pulsars known in this galaxy.
Aims: SXP 1323 is in the field of view of a large set of calibration observations that we analyse syste…
Evidence for different accretion regimes in GRO J1008-57
Rothschild, Richard E.; Fürst, Felix; Klochkov, Dmitry +6 more
We present a comprehensive spectral analysis of the BeXRB
Swift J164449.3+573451 and Swift J2058.4+0516: Black hole mass estimates for tidal disruption event sources
Titarchuk, Lev; Seifina, Elena; Virgilli, Enrico
A tidal disruption event (TDE) is an astronomical phenomenon in which a previously dormant black hole (BH) destroys a star passing too close to its central part. We analyzed the flaring episode detected from the TDE sources, Swift J164449.3+573451 and Swift J2058.4+0516 (hereafter Swift J1644+57 and Swift J2058+05, respectively) using RXTE, Swift …
A high spectral resolution map of the nuclear emitting regions of NGC 7582
Bianchi, S.; Piconcelli, E.; Reeves, J. N. +2 more
We present the results of the spatial and spectral analysis of the deep ( 200 ks) Chandra HETG observation of the changing look AGN NGC 7582. During this long Chandra observation, NGC 7582 was in a highly obscured state. Therefore, we also consider a short ( 24 ks) Suzaku observation, which caught NGC 7582 in a Compton thick state. This allows us …
The Phoenix galaxy as seen by NuSTAR
Harrison, F. A.; Stern, D.; Zhang, W. W. +18 more
Aims: We study the long-term variability of the well-known Seyfert 2 galaxy Mrk 1210 (also known as UGC 4203, or the Phoenix galaxy).
Methods: The source was observed by many X-ray facilities in the last 20 yr. Here we present a NuSTAR observation and put the results in the context of previously published observations.
Results: NuST…