The Open UniversitySkip to content

Tracing a Z-track in the M 31 X-ray binary RX J0042.6+4115

Barnard, R.; Kolb, U. and Osborne, J. P. (2003). Tracing a Z-track in the M 31 X-ray binary RX J0042.6+4115. Astronomy & Astrophysics, 411(3) pp. 553–557.

Full text available as:
PDF (Version of Record) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (224Kb)
DOI (Digital Object Identifier) Link:
Google Scholar: Look up in Google Scholar


Four XMM-Newton observations of the core of M 31, spaced at 6 month intervals, show that the brightest point X-ray source, RX J0042.6+4115, has a 0.4-10 keV luminosity of ~ 5x1038 erg s-1, and exhibits significant variability in intensity and X-ray spectrum over a time scale of ~100 s including hard flares; such behaviour is only observed in Z-sources and transient black hole binaries in our Galaxy. The lightcurves, X-ray spectra and hardness-intensity data from the four XMM-Newton observations all strongly suggest that it is a Z-source, bringing the total number of known Z-sources to nine.

Item Type: Journal Article
Copyright Holders: 2003 ESO
ISSN: 1432-0746
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetParticle Physics and Astronomy Research Council
Keywords: X-rays; galaxies; M 31; binaries
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 4881
Depositing User: Users 6041 not found.
Date Deposited: 17 Jul 2006
Last Modified: 15 Jan 2016 19:07
Share this page:


Scopus Citations

Actions (login may be required)

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340