Search Publications
Super-Eddington accretion on to the neutron star NGC 7793 P13: Broad-band X-ray spectroscopy and ultraluminous X-ray sources
Harrison, F. A.; Ptak, A.; Stern, D. +8 more
We present a detailed, broad-band X-ray spectral analysis of the ultraluminous X-ray source (ULX) pulsar NGC 7793 P13, a known super-Eddington source, utilizing data from the XMM-Newton, NuSTAR and Chandra observatories. The broad-band XMM-Newton+NuSTAR spectrum of P13 is qualitatively similar to the rest of the ULX sample with broad-band coverage…
Using principal component analysis to understand the variability of PDS 456
Fabian, A. C.; Buisson, D. J. K.; Reeves, J. N. +2 more
We present a spectral-variability analysis of the low-redshift quasar PDS 456 using principal component analysis. In the XMM-Newton data, we find a strong peak in the first principal component at the energy of the Fe absorption line from the highly blueshifted outflow. This indicates that the absorption feature is more variable than the continuum,…
A new powerful and highly variable disc wind in an AGN-star-forming galaxy, the case of MCG-03-58-007
Campana, S.; Turner, T. J.; Ballo, L. +7 more
We present the discovery of a new candidate for a fast disc wind, in the nearby Seyfert 2 galaxy MCG-03-58-007. This wind is discovered in a deep Suzaku observation that was performed in 2010. Overall the X-ray spectrum of MCG-03-58-007 is highly absorbed by a neutral column density of NH ∼1023 cm-2, in agreement w…
Multi-epoch analysis of the X-ray spectrum of the active galactic nucleus in NGC 5506
Ni, Qingling; Bambi, Cosimo; Guainazzi, Matteo +5 more
We present a multi-epoch X-ray spectroscopy analysis of the nearby narrow-line Seyfert I galaxy NGC 5506. For the first time, spectra taken by Chandra, XMM-Newton, Suzaku, and NuSTAR- covering the 2000-2014 time span - are analysed simultaneously, using state-of-the-art models to describe reprocessing of the primary continuum by optical thick matt…
Broad-band spectral study of the jet-disc emission in the radio-loud narrow-line Seyfert 1 galaxy 1H 0323+342
Dewangan, Gulab C.; Raychaudhuri, Biplab; Mallick, Labani +1 more
We present a broad-band spectral study of the radio-loud narrow-line Seyfert 1 galaxy 1H 0323+342 based on multi-epoch observations performed with Nuclear Spectroscopic Telescope Array on 2014 March 15, and two simultaneous observations performed with Suzaku and Swift on 2009 July 26 and 2013 March 1. We found the presence of a strong soft X-ray e…
Disentangling the complex broad-band X-ray spectrum of IRAS 13197-1627 with NuSTAR, XMM-Newton and Suzaku
Harrison, F. A.; Stern, D.; Fabian, A. C. +8 more
We present results from a coordinated XMM-Newton+NuSTAR observation of the type 1.8 Seyfert galaxy IRAS 13197-1627. This is a highly complex source, with strong contributions from relativistic reflection from the inner accretion disc, neutral absorption and further reprocessing by more distant material, and ionized absorption from an outflow. We u…
The absence of a thin disc in M81*
McHardy, I.; Young, A. J.; Emmanoulopoulos, D. +1 more
We present the results of simultaneous Suzaku and NuSTAR observations of the nearest low-luminosity active galactic nucleus (LLAGN), M81*. The spectrum is well described by a cut-off power law plus narrow emission lines from Fe K α, Fe xxv, and Fe xxvi. There is no evidence of Compton reflection from an optically thick disc, and we obtain the stro…
Suzaku observations of the Monogem Ring and the origin of the Gemini H α ring
Sasaki, Manami; Plucinsky, Paul P.; Knies, Jonathan R.
We present the analysis of Suzaku X-ray observations of the Galactic supernova remnant (SNR) `Monogem Ring', a large structure observed in X-rays with an extent of ≈25°, located at an anticentre position. One observation close to the shock also coincides with a large ring-like structure observed in H α, which is called the `Gemini H α ring'. We in…
Observation of variable pre-eclipse dips and disc windsin the eclipsing LMXB XTE J1710-281
Maitra, Chandreyee; Paul, Biswajit; Raman, Gayathri
We report the first detection of highly ionized Fe species in the X-ray spectrum of the eclipsing and dipping Low-Mass X-ray Binary XTE J1710-281. Using archival Chandra and Suzaku observations, we have carried out a spectro-timing analysis of the source during three different epochs. We compare the average orbital profile and obtain differences i…
Exploring the spectral variability of the Seyfert 1.5 galaxy Markarian 530 with Suzaku
Gallo, L. C.; Gonzalez, A. G.; Ehler, H. J. S.
A 2012 Suzaku observation of the Seyfert 1.5 galaxy Markarian 530 was analysed and found to exhibit two distinct modes of variability, which were found to be independent from one another. First, the spectrum undergoes a smooth transition from a soft to hard spectrum. Secondly, the spectrum displays more rapid variability seemingly confined to a ve…