5 papers · 1 filter
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…