We propose to perform two 170 ks INTEGRAL target of opportunity (ToO) observations of a transient millisecond X-ray pulsar in outburst. To constrain the broadband spectrum we also request one 30 ks simultaneous NuSTAR and two 50 ks XMM-Newton observations. The target can be either one of the twenty-one known transient accreting millisecond X-ray pulsars (AMXPs) under going a new outburst, or a newly discovered object of this class. These observations will allow us to study the broad band spectrum, from hard to soft X-ray energies, as well as the timing properties or eclipsing features of the source during its outburst. The spectral information will make it possible to disentangle the contributions of soft black body, reflection (if any), and hard Comptonized spectral components. Moreover, we may detect type-I X-ray bursts, and/or for the first time also burst oscillations at high-energy (if present). The INTEGRAL, NuSTAR, NICER, Insight-HXMT, Swift and XMM-Newton observations will also allow a timing analysis to study the pulse profile, time lags and pulsed spectrum, and will thus provide important constraints on emission mechanisms.Similar proposals were approved for the INTEGRAL AO2-AO18 cycles, and during these years our ToO has been triggered ten times: in 2003 we observed XTE J1807-294, in 2004, 2005, 2009, 2011, and 2013 we triggered on newly discovered sources IGR J00291+5934, HETE J1900.1-2455, IGR J17511-3057, IGR J17498-2921, and IGR J18245-2452, respectively. In 2015, we triggered on IGR J00291+5934 and SAX J1748.9-2021, and in 2018 we triggered again on a newly discovered source IGR J17591-2342 and Swift J1756.9-2508.
Primordial black hole dark matter in the context of extra dimensions - Friedlander, Avi, Mack, Katherine J.,Schon, Sarah,Song, Ningqiang,Vincent, Aaron C. (2022-05-01) http://ui.adsabs.harvard.edu/#abs/2022PhRvD.105j3508F
Temporal Coverage
2022-08-24T16:29:20Z / 2022-08-26T21:39:54Z
Version
1.0
Mission Description
The INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched by the European Space Agency (ESA) on October 17, 2002, was designed to study high-energy phenomena in the universe. INTEGRAL was operating until february 2025 and it was equipped with three high-energy instruments: the Imager on Board the INTEGRAL Satellite (IBIS), the Spectrometer on INTEGRAL (SPI), and the JEM-X (Joint European Monitor for X-rays). Its Optical Monitoring Camera (OMC) provided optical V-band magnitude measurements, complementing the high-energy observations.
European Space Agency, Li, 2025, 'Measuring the High Energy Emission of Millisecond X-Ray Pulsars in Outburst', 1.0, European Space Agency, https://doi.org/10.57780/esa-l2obh8i
