A dataset provided by the European Space Agency

Name: Observing the Extreme ULX Circinus ULX5 in an Extreme Flux State
Published: 2019-02-26T23:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	078095
Title	Observing the Extreme ULX Circinus ULX5 in an Extreme Flux State
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0780950201
DOI	https://doi.org/10.5270/esa-rqfs8mp
Principal Investigator, PI	Dr Dominic Walton
Abstract	The NuSTAR observatory recently detected a previously unidentified extreme(Lx,peak ~ 2e40 erg/s) ultraluminous X-ray source (ULX) in the outskirts ofCircinus: Circinus ULX5. The current data support a simple disc-corona model,reminiscent of that invoked for Galactic binaries, implying the presence of amassive (~90 Msun) black hole accreting around its Eddington limit. This is anexciting possibility, as the presence of such a black hole may pose a challengeto our current understanding of stellar evolution. We propose to test thisscenario by undertaking a short 40 ks XMM ToO observation of ULX5 in an extremelow flux state. Should this scenario be correct, the source should transition toa regular disc-dominated state, which can easily be identified by XMM.
Publications	CG X-1: An Eclipsing Wolf--Rayet ULX in the Circinus Galaxy \|Qiu Yanli Soria Roberto et al. \| ApJ \| 877-57 \| 2019 \| 2019ApJ...877...57Q \| http://ui.adsabs.harvard.edu/#abs/2019ApJ...877...57Q The exceptional X-ray evolution of SN 1996cr in high resolution \|Quirola-Vu00e1squez J. Bauer F. E. et al. \| MNRAS \| 490-4536 \| 2019 \| 2019MNRAS.490.4536Q \| http://ui.adsabs.harvard.edu/#abs/2019MNRAS.490.4536Q Classification of 4XMM-DR9 sources by machine learning \|Zhang Yanxia Zhao Yongheng \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z Spectral state transitions in Circinus ULX5 \|Mondal Samaresh Ru00f3u017cau0144ska Agata et al. \| A&A \| 651-54 \| 2021 \| 2021A&A...651A..54M \| http://ui.adsabs.harvard.edu/#abs/2021A&A...651A..54M
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2018-02-07T11:55:14Z/2018-02-08T00:36:54Z
Version	21.51_20241115_1113
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	2019-02-26T23:00:00Z
Last Update	2026-07-09
Keywords	"data support", "nustar observatory", "ulx circinus ulx5", "circinus ulx5", "2e40 erg", "regular disc dominated", "NuSTAR", "msun blackhole accreting", "XMM", "galactic binary", "eddington limit", "low flux", "stellar evolution"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Dominic Walton, 2019, 'Observing the Extreme ULX Circinus ULX5 in an Extreme Flux State', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-rqfs8mp
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.