13 papers
A ULX in NGC 4559: a "mini-cartwheel" scenario?
Roberto Soria, Mark Cropper, Manfred Pakull
We have studied an ultraluminous X-ray source (ULX) in NGC 4559 with XMM-Newton, and its peculiar star-forming environment with HST/WFPC2. The X-ray source is one of the brightest…
Multi-epoch spectroscopy and XMM-Newton observations of RX J2115-58
Mark Cropper, Gavin Ramsay, Tom Marsh
We present phase resolved optical spectroscopy and X-ray light curves of the asynchronous polar RX J2115-58 as they change on the beat period.
Stream eclipse mapping with 'fire-flies'
C. M. Bridge, Pasi Hakala, Mark Cropper +1
We apply a new method of eclipse mapping to the light curves of eclipsing polars. The technique aims to locate the bright emission associated with the accretion stream, using a tec…
Accretion Flow Along a Dipolar Field: Application to Intermediate Polars
J. B. G. Canalle, Kinwah Wu, Mark Cropper +2
A hydrodynamic formulation for accretion flow channeled by a dipolar magnetic field is constructed using a curvi-linear coordinate system natural to the field structure. We solve t…
The XMM-Newton-MSSL survey of Polars
Gavin Ramsay, Mark Cropper
The XMM-Newton-MSSL survey of polars is a snapshot survey of nearly 40 polars. We present the initial results, with an emphasis on the energy balance in these systems and the numbe…
Timing study of the isolated neutron star RX J0720.4-3125
Silvia Zane, Frank Haberl, Mark Cropper +4
We present a combined analysis of XMM-Newton, Chandra and Rosat observations of the isolated neutron star RX J0720.4-3125, spanning a total period of \sim 7 years. We develop a max…