The transient IGR J16358-4726 was discovered on 2003 March 19 by INTEGRAL. OurMarch 24th CXO observation detected the transient at the 1.7e-10 erg cm^-2 s^-1flux level (unabs; 2-10 keV) with a high absorption column (NH=3.3(1)e23 cm^-2)and a hard power law spectrum of index 0.5(1). A strong flux modulation with aperiod of 5860(50)s and PTP pulse fraction of 63(6)% (2-10 keV) is clearlyvisible in the x-ray data. The only NS systems known with similar spin periodsare low luminosity persistent wind-fed pulsars; if this is a spin period, IGRJ16358-4726 is a new kind of object. If this is an orbital period, then thesystem could be a compact LMXB. We request observations with XMM of IGRJ16358-4726 to place constraints to the nature of this enigmatic transient.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2004-02-16T14:10:13Z/2004-09-05T03:09:05Z
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 SANDEEP K. PATEL, 2005, 'DETERMINING THE NATURE OF THE PECULIAR X-RAY TRANSIENT IGR J16358-4726', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-qepz8rn
