Search Publications
Calibration of the NuSTAR High-energy Focusing X-ray Telescope.
An, Hongjun; Hailey, Charles J.; Walton, Dominic J. +19 more
We present the calibration of the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray satellite. We used the Crab as the primary effective area calibrator and constructed a piece-wise linear spline function to modify the vignetting response. The achieved residuals for all off-axis angles and energies, compared to the assumed spectrum, are typical…
The Suzaku view of highly ionized outflows in AGN - II. Location, energetics and scalings with bolometric luminosity
Cappi, M.; Turner, T. J.; Tombesi, F. +4 more
Ongoing studies with XMM-Newton have shown that powerful accretion disc winds, as revealed through highly ionized Fe K-shell absorption at E ≥ 6.7 keV, are present in a significant fraction of active galactic nuclei (AGNs) in the local Universe (Tombesi et al. 2010a). In Gofford et al., we analysed a sample of 51 Suzaku-observed AGNs and independe…
NuSTAR and Suzaku Observations of the Hard State in Cygnus X-1: Locating the Inner Accretion Disk
Harrison, F. A.; Stern, D.; Zhang, W. W. +20 more
We present simultaneous Nuclear Spectroscopic Telescope Array (NuSTAR ) and Suzaku observations of the X-ray binary Cygnus X-1 in the hard state. This is the first time this state has been observed in Cyg X-1 with NuSTAR, which enables us to study the reflection and broadband spectra in unprecedented detail. We confirm that the iron line cannot be…
Driving extreme variability: the evolving corona and evidence for jet launching in Markarian 335
Gallo, L. C.; Wilkins, D. R.
Variations in the X-ray emission from the narrow-line Seyfert 1 galaxy, Markarian 335, are studied on both long and short time-scales through observations made between 2006 and 2013 with XMM-Newton, Suzaku and NuSTAR. Changes in the geometry and energetics of the corona that give rise to this variability are inferred through measurements of the re…
A Chandrasekhar Mass Progenitor for the Type Ia Supernova Remnant 3C 397 from the Enhanced Abundances of Nickel and Manganese
Petre, Robert; Yamaguchi, Hiroya; Koyama, Katsuji +8 more
Despite decades of intense efforts, many fundamental aspects of Type Ia supernovae (SNe Ia) remain elusive. One of the major open questions is whether the mass of an exploding white dwarf (WD) is close to the Chandrasekhar limit. Here, we report the detection of strong K-shell emission from stable Fe-peak elements in the Suzaku X-ray spectrum of t…
A Suzaku search for dark matter emission lines in the X-ray brightest galaxy clusters
Simionescu, A.; Kaastra, J. S.; Allen, S. W. +3 more
We present the results of a search for unidentified emission lines in deep Suzaku X-ray spectra of the central regions of the X-ray brightest galaxy clusters: Perseus, Coma, Virgo and Ophiuchus. We analyse an optimized energy range (3.2-5.3 keV) that is relatively free of instrumental features, and a plasma emission model incorporating the abundan…
Suzaku observations of Mrk 335: confronting partial covering and relativistic reflection
Fabian, A. C.; Komossa, S.; Gallo, L. C. +7 more
We report on the deepest X-ray observation of the narrow-line Seyfert 1 galaxy Mrk 335 in the low-flux state obtained with Suzaku. The data are compared to a 2006 high-flux Suzaku observation when the source was ∼10 times brighter. Describing the two flux levels self-consistently with partial covering models would require extreme circumstances, as…
The growth of the galaxy cluster Abell 85: mergers, shocks, stripping and seeding of clumping
Simionescu, A.; Mernier, F.; Takahashi, T. +5 more
We present the results of deep Chandra, XMM-Newton and Suzaku observations of the nearby galaxy cluster Abell 85, which is currently undergoing at least two mergers, and in addition shows evidence for gas sloshing which extends out to r ≈ 600 kpc. One of the two infalling subclusters, to the south of the main cluster centre, has a dense, X-ray bri…
An X-ray spectroscopic search for dark matter in the Perseus cluster with Suzaku
Maeda, Yoshitomo; Iizuka, Ryo; Mitsuda, Kazuhisa +2 more
We present the results from deep Suzaku observations of the central region of the Perseus cluster. Bulbul et al. (2014, ApJ, 789, 13) reported the detection by XMM-Newton instruments of an unidentified X-ray emission line at an energy around 3.5 keV in spectra for the Perseus and other clusters. They argued for a possibility of the decay of steril…
NuSTAR and Suzaku X-ray Spectroscopy of NGC 4151: Evidence for Reflection from the Inner Accretion Disk
Harrison, F. A.; Stern, D.; Fabian, A. C. +19 more
We present X-ray timing and spectral analyses of simultaneous 150 ks Nuclear Spectroscopic Telescope Array (NuSTAR) and Suzaku X-ray observations of the Seyfert 1.5 galaxy NGC 4151. We disentangle the continuum emission, absorption, and reflection properties of the active galactic nucleus (AGN) by applying inner accretion disk reflection and absor…