We have recently discovered the first SGR with a low magnetic field (Rea et al.2010, Science, 330, 944), SGR 0418+5729, discovered in outburst after it emittedbursts similar to those of magnetars (B<7.5x10^{12} G). This discovery had largeimplications not only for the magnetar model, but for the pulsars population ingeneral. We have now a tentative measure (at 3.5sigma level) of its periodderivative resulting in a B-field virgul6x10^{12} G). We ask now for a final 75ks XMMobservation to confirm this detection at >5sigma. This will lead to have a finalmeasure of SGR 0418+5729 dipolar magnetic field, crucial for tuning the magnetarmodel as well as predict how many hidden magnetars there might be within thepulsar population.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2013-08-15T18:06:25Z/2013-08-18T11:57:17Z
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 Nanda Rea, 2014, 'Final measure of the dipolar magnetic field of the first low-B SGR', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-yk5gnuu
