A Z-source candidate has been identified in the core of M31 using data fromexisting XMM-Newton observations. Z-sources are perhaps the most extreme form ofneutron star binary; powered by Roche lobe overflow from a low mass secondaryvia disc accretion, their X-ray luminosities can reach 10^39 erg/s,and exhibitcomplex correlations between luminosity and X-ray spectra so thatthey trace outZ-shapes in colour-colour diagrams over a few days. We propose a programme offour 20 ks observations over 4 days to trace the Z-track, which willconclusively prove whether or not the candidate is a Z-source. Also, theprogramme would access for the first time variability over time-scales of a fewdays in the 120 sources in the field of view.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2004-07-16T16:17:05Z/2004-07-19T20:23:32Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr ROBIN BARNARD, 2005, 'TRACKING THE ANDROMEDA Z-SOURCE CANDIDATE RX J0042.6+4115', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-63pxg4n
