| Name | 084234 |
| Title | UNVEILING BLACK HOLES AND NEUTRON STARS IN ULXs |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0842340201 |
| DOI | https://doi.org/10.5270/esa-4ar2lfp |
| Author | European Space Agency |
| 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, Unveiling Black Holes And Neutron Stars In Ulxs, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-4ar2lfp |