Search Publications

XMM-EPIC observation of MCG-6-30-15: direct evidence for the extraction of energy from a spinning black hole?

Staubert, Rüdiger; Wilms, Jörn; Reynolds, Christopher S. +4 more

We present XMM-Newton European Photon Imaging Camera (EPIC) observations of the bright Seyfert 1 galaxy MCG-6-30-15, focusing on the broad Fe Kα line at ~6keV and the associated reflection continuum, which is believed to originate from the inner accretion disc. We find these reflection features to be extremely broad and redshifted, indicating an o…

Surveying the sky with the Arcminute MicroKelvin Imager: expected constraints on galaxy cluster evolution and cosmology

Lasenby, Anthony N.; Cotter, Garret; Grainge, Keith +4 more

We discuss prospects for cluster detection via the Sunyaev-Zel'dovich (SZ) effect in a blank field survey with the interferometer array, the Arcminute MicroKelvin Imager (AMI). Clusters of galaxies selected in the SZ effect probe cosmology and structure formation with little observational bias, because the effect measures integrated gas pressure d…

An XMM-Newton observation of the extreme narrow-line Seyfert 1 galaxy Mrk 359

O'Brien, P. T.; Reeves, J. N.; Pounds, K. +3 more

We present XMM-Newton observations of Mrk 359, the first narrow-line Seyfert 1 galaxy (NLS1) discovered. Even among NLS1s, Mrk 359 is an extreme case with extraordinarily narrow optical emission lines. The XMM-Newton data show that Mrk 359 has a significant soft X-ray excess which displays only weak absorption and emission features. The (2-10)keV …

First XMM-Newton observations of strongly magnetic cataclysmic variables - I. Spectral studies of DP Leo and WW Hor

Cropper, Mark; Ramsay, Gavin; Córdova, France +4 more

We present an analysis of the X-ray spectra of two strongly magnetic cataclysmic variables, DP Leo and WW Hor, made using XMM-Newton. Both systems were in intermediate levels of accretion. Hard optically thin X-ray emission from the shocked accreting gas was detected from both systems, while a soft blackbody X-ray component from the heated surface…

Ionization structure in accretion shocks with a composite cooling function

Cropper, Mark; Wu, Kinwah; Ramsay, Gavin

We have investigated the ionization structure of the post-shock regions of magnetic cataclysmic variables, using an analytic density and temperature structure model in which effects caused by bremsstrahlung and cyclotron cooling are considered. We find that in the majority of the shock-heated region where H- and He-like lines of the heavy elements…