Joint INTEGRAL and XMM-Newton observations of GRS 1915+105. We have been monitoring the black hole binary GRS 1915+105 since March 2019 in radio with the MeerKAT Interferometer (South Africa) and with the AMI-LA telescope (UK), as well in the X-rays with the All-Sky monitor Swift/BAT and MAXI on the ISS and with dedicated Swift/XRT observations. Since July 2019, GRS 1915+105 has been showing a varying behaviour, displaying accretion states very rarely or never observed in the past ~30 years of its current outburst.After sampling a relatively soft (and obscured) state, GRS 1915+105 went back to a harder state approximately 2 weeks ago. Very recently (September 30th), the MAXI/GSC light curve showed a sudden decrease in count rate, accompanied by a decrease in radio emission. We triggered a dense Swift monitoring of the source, and we started monitoring the target daily with AMI-LA in radio. The energy spectrum measured by XRT is a power law with photon index ~0.8, affected by heavy absorption, with an equivalent N_H of ~3E+23/cm2. This spectral shape suggest obscuration and likely a high level of radiation reprocessing, which will be probed in detail by INTEGRAL. In radio the target shows a low flux density (~3mJy), and very limited variability. The combination of heavily absorbed/reprocessed X-ray emission and low, non-variable radio emission has not been observed in detailed so far. We have observed (1) low X-ray flux flux without local absorption + low flux radio emission; (2) heavily absorbed X-ray emission and high flux density and variable radio emission; (3) heavily absorbed (soft) X-ray emission and moderate (~10mJy) non variable radio emission. We hereby require to trigger joint XMM+INTEGRAL proposal 086496 (P.I.: Motta), to observe GRS 1915+105 transitioning to a new - likely radio quiet (only core jet emission) - obscured state.
Magnetars and axion-like particles: probes with the hard X-ray spectrum - Fortin, Jean-Francois, Guo, Huai-Ke,Harris, Steven P.,Sheridan, Elijah,Sinha, Kuver (2021-06-01) http://ui.adsabs.harvard.edu/#abs/2021JCAP...06..036F
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
2021-10-09T13:27:49Z / 2021-10-10T16:02:56Z
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, Motta, 2025, 'Joint INTEGRAL and XMM-Newton observations of GRS 1915+105', 1.0, European Space Agency, https://doi.org/10.57780/esa-glvn34n
