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New XMM-Newton analysis of three bright X-ray sources in M31 globular clusters, including a new black hole candidate
R. Barnard, H. Stiele, D. Hatzidimitriou +6
We present detailed analysis of three globular cluster X-ray sources in the XMM-Newton extended survey of M31. The X-ray counterpart to the M31 globular cluster Bo 45 (XBo 45) was…
An X-ray spectral survey of the disc of M31 with XMM-Newton
L. Shaw Greening, R. Barnard, U. Kolb +2
We present the results of a complete spectral survey of the X-ray point sources detected in five XMM-Newton observations along the major axis of M31 but avoiding the central bulge,…
A multi-coloured survey of NGC 253 with XMM-Newton: testing the methods used for creating luminosity functions from low-count data
R. Barnard, L. Shaw Greening, U. Kolb
NGC 253 is a local, star-bursting spiral galaxy with strong X-ray emission from hot gas, as well as many point sources. We have conducted a spectral survey of the X-ray population…
A deep XMM-Newton survey of M 31
H. Stiele, W. Pietsch, F. Haberl
The deep homogeneous survey of the large Local-Group spiral galaxy M 31 is a milestone project for X-ray astronomy, as it allows a detailed X-ray inventory of an archetypal low-sta…
A Multi-coloured survey of NGC 253 with XMM-Newton
R. Barnard, L. Shaw Greening, U. Kolb
There is a large body of work that has used the excellent Chandra observations of nearby galaxies with neglible low mass X-ray binary (LMXB) populations. This has culminated in a `…
On the artificial nature of aperiodic variability in XMM-Newton observations of M31 X-ray sources and the ultraluminous X-ray source NGC 4559 ULX-7
R. Barnard, S. Trudolyubov, U. C. Kolb +3
Context: Power density spectra (PDS) that are characteristic of low mass X-ray binaries (LMXBs) have been previously reported for M31 X-ray sources, observed by XMM-Newton. However…
Cumulative luminosity functions of the X-ray point source population in M31
L. Shaw Greening, C. Tonkin, R. Barnard +2
We present preliminary results from a detailed analysis of the X-ray point sources in the XMM-Newton survey of M31. These sources are expected to be mostly X-ray binaries. We have…
XMM-Newton reveals ~100 new LMXBs in M31 from variability studies
R. Barnard, L. Shaw Greening, C. Tonkin +2
We have conducted a survey of X-ray sources in XMM-Newton observations of M31, examining their power density spectra (PDS) and spectral energy distributions (SEDs). Our automated s…
Timing the bright X-ray population of the core of M31 with XMM-Newton
R. Barnard, U. Kolb, J. P. Osborne
All 63 discrete X-ray sources brighter than L_{\rm X} = 5x10^{36} erg/s in any of four XMM-Newton observations of the core of M31 were surveyed for time variability over time-scale…
Discovery of disc precession in the M31 dipping X-ray binary Bo 158
R. Barnard, S. B. Foulkes, C. A. Haswell +3
We present results from three XMM-Newton observations of the M31 low mass X-ray binary XMMU J004314.4+410726.3 (Bo 158), spaced over 3 days in 2004, July. Bo 158 was the first dipp…
Identifying a black hole X-ray transient in M31 with XMM-Newton and Chandra
R. Barnard, U. Kolb, J. P. Osborne
Stochastic variability in two out of four XMM-Newton observations of XMMU J004303+4115 along with its power spectra and X-ray luminosities suggest a low-mass X-ray binary (LMXB) wi…
RX J0042.3+4115: a stellar mass black hole binary identified in M31
R. Barnard, J. P. Osborne, U. Kolb +1
Four XMM-Newton X-ray observations of the central region of the Andromeda Galaxy (M31) have revealed an X-ray source that varies in luminosity over \~1--3, 10^{38} erg s^{-1} betwe…
AE Aquarii: how CVs descend from supersoft binaries
K. Schenker, A. R. King, U. Kolb +2
AE Aquarii is a propeller system. It has the shortest spin period among cataclysmic variables, and this is increasing on a 10^7 yr timescale. Its UV spectrum shows very strong carb…
The systemic velocities of four long-period cataclysmic variable stars
R. C. North, T. R. Marsh, U. Kolb +2
Although a large number of orbital periods of cataclysmic variable stars (CVs) have been measured, comparison of period and luminosity distributions with evolutionary theory is aff…
Nova-induced mass transfer variations
Ulrich Kolb, Saul Rappaport, Klaus Schenker +1
We investigate variations of the mass transfer rate in cataclysmic variables (CVs) that are induced by nova outbursts. The ejection of nova shells leads to a spread of transfer rat…
A mystery solved: the mass ratio of the dwarf nova EM Cygni
R. C. North, T. R. Marsh, C. K. J. Moran +3
We have discovered that the spectrum of the well-known dwarf nova EM Cyg is contaminated by light from a K2-5V star (in addition to the K-type mass donor star). The K2-5V star cont…