After more than 40 years of studies, surprisingly little is known on theemission of accreting pulsars at low-luminosity. It was suggested that alreadyat 10^{35} ergs/s the onset of a centrifugal barrier should inhibit theaccretion. On the other hand, pulsations during quiescence were reported forthree transient pulsars, namely 1Avirgul0535+262, 4Uvirgul1145-619, and 1Avirgul1118-61.Accretion nature of the emission is suggested by short-term variability,energetics, hard X-ray spectrum and pulsations. It is unclear, however how theaccretion proceeds in this case. Here, we propose to observe 1Avirgul0535+262,4Uvirgul1145-619, and 1Avirgul1118-61 with XMM-Newton to study their spectral and timingproperties to clarify the nature of pulsed emission at low luminosities.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2012-02-28T07:18:04Z/2012-02-28T23:59:39Z
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, Mr Victor Doroshenko, 2013, 'Accreting pulsars in quiescence', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-hisou1r
