A dataset provided by the European Space Agency

Name: Unveiling the true nature of the remarkable transient ASASSN-15lh
Published: 2019-04-30T22:00:00Z

Proposal ID	080228
Title	Unveiling the true nature of the remarkable transient ASASSN-15lh
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0802280101
DOI	https://doi.org/10.5270/esa-nhjjoju
Principal Investigator, PI	Dr Raffaella Margutti
Abstract	We propose deep X-ray observations of ASASSN-15lh at t>500 days to unveil itsnature, as part of our multi-wavelength follow-up. ASASSN-15lh has been inter-preted as either (i) the most luminous stellar explosion, or (ii) a stellartidal disruption by the most massive, spinning black hole to date. In eithercase the observed properties of ASASSN-15lh are unprecedented, with profoundimplications to our understanding of stellar explosions (case i) or stronggravity regimes around supermassive spinning BHs (case ii). The two scenarioshave markedly different predictions of the associated X-ray emission and itsevolution at late times. Continued monitoring of the X-ray source that weuncovered at its location thus holds the keys to unveiling the true nature of this unique transient.
Publications	The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII, O VIII, and Fe L-shell Transitions \|Pan, Zeyang, Qu, Zhijie, et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez, Antonio C., \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2018-04-12T10:58:36Z/2018-04-13T13:48:36Z
Version	17.56_20190403_1200
Mission Description	The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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	2019-04-30T22:00:00Z
Keywords	"gravity regimes", "stellar tidal disruption", "luminous stellar explosion", "spinning blackhole", "multi wavelength", "deep xray", "xray source", "inter preted", "stellar explosions", "xray emission", "transient asassn 15lh", "asassn 15lh", "supermassive spinning bhs", "profound implications"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Raffaella Margutti, 2019, 'Unveiling the true nature of the remarkable transient ASASSN-15lh', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-nhjjoju