A dataset provided by the European Space Agency

Name 078451
Title Searching for IMBH candidates among Ultraluminous X-ray Sources
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0784510301

DOI 10.5270/esa-5y6p2xl
Author Dr Fabio Pintore
Description A sub-sample of bright Ultraluminous X-ray Sources (L_X~(1-5)x10^40 erg-s) shows peculiar powerlaw like spectra, with no high energy turn-off and short-term variability at the level of ~10%. These sources might host Intermediate Mass Black Holes (IMBHs) in a low-hard state, although their apparently flat spectral shape may be the effect of poor counting statistics. Here we propose simultaneous, deep XMM- Newton and NuSTAR observations of four such objects to find evidence either of the X-ray properties (powerlaw spectra and short term variability) that should characterize sub-Eddington accretion onto an IMBH or of the characteristic spectral curvature of the 'Ultraluminous state..
Publication The two ultraluminous X-ray sources in the galaxy NGC 925 . Pintore, F., Zampieri, L., et all. . MNRAS . 479-4271 . 2018 . 2018MNRAS.479.4271P ,
The (Re)appearance of NGC 925 ULX-3, a New Transient ULX . Earnshaw, Hannah P., Heida, Marianne, et all. . ApJ . 891-153 . 2020 . 2020ApJ...891..153E ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2017-01-18T19:45:14Z/2017-01-19T09:38:34Z
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 2018-03-29T22:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2018-03-29T22:00:00Z, 078451, 17.56_20190403_1200. https://doi.org/10.5270/esa-5y6p2xl