GRO J1744\−28 is a unique source appearing as an X-ray pulsar and apeculiar burster. This unusual combination is thought to be related to moderatefield Bvirgul5e11G which is higher than in old millisecond, but lower than in normalX- ray pulsars. Given field estimate, it the source is expected to switch to theso-called propeller regime in quiescene, with only non-pulsed thermal emissionfrom neutron stars surface still to be expected. However serendipuousobservations in quiescence revealed a spectrum fully compatible outburstspectrum rather than that expected from a pulsar in propeller . It is thusunclear whether accretion is actually inhibited. We thus propose a 50ksobservation to investigate the physical origin of the observed X-ray emission.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2019-04-04T05:36:12Z/2019-04-04T22:57:52Z
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 Victor Doroshenko, 2020, 'The dark side of the bursting pulsar', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-j65xlje
