A dataset provided by the European Space Agency

Name 084234


DOI https://doi.org/10.5270/esa-4ar2lfp
Author Mr Fabio Pintore
Description A sub-sample of bright ULXs (Lxvirgul(1-5)e40 erg-s) shows peculiar powerlaw like spectra in the 0.3- 10 keV band, with no high energy turn-off and short-term variability at the level of virgul10%. These sources might host Intermediate Mass Black Holes (IMBHs) in a hard state, although their apparently flat spectra may be the effect of low counting statistics. However, hard states with low energy spectral cut-off can indicate the presence of super-Eddington accreting neutron stars or stellar mass BHs. Here we propose simultaneous, deep XMM-Newton and NuSTAR observations of three best candidates to find evidence either of IMBHs, accreting sub-Eddington and with hard powerlaw spectra and high short term variability, or of the characteristic spectral shape of the super-Eddington accretion.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2019-06-16T18:19:55Z/2019-06-17T15:16:35Z
Version 17.56_20190403_1200
Mission Description The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2020-07-12T22:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2020-07-12T22:00:00Z, 084234, 17.56_20190403_1200. https://doi.org/10.5270/esa-4ar2lfp