A dataset provided by the European Space Agency

Name: Understanding state transitions in ULXs: diagnostics through wind spectroscopy
Published: 2021-07-22T00:00:00Z

Proposal ID	086481
Title	Understanding state transitions in ULXs: diagnostics through wind spectroscopy
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0864810101
DOI	https://doi.org/10.57780/esa-idtrrv0
Principal Investigator, PI	Dr Ciro Pinto
Abstract	In recent work done with XMM-Newton, we have discovered that ultraluminous X-raysources have strong relativistic winds in agreement with theoretical predictionsof super-Eddington accretion. Such winds vary on timescales of days and canbecome optically thick enough to block and reprocess the disc X-ray photons,thus changing the spectral shape of the source into an ultraluminous supersoftX-ray source. We propose to test this hypothesis, by studying a transitionalobject where the wind is so strong that it is already causing significantabsorption of the harder X-ray continuum: NGC 55 ULX. A 130ks XMM observationtriggered during a high X-ray flux state will enable to performtime-/flux-resolved X-ray spectroscopy of the wind and probe the transition from supersoft to soft ULX.
Publications	Ionized emission and absorption in a large sample of ultraluminous X-ray sources \|Kosec P. Pinto C. et al. \| MNRAS \| 508-3569 \| 2021 \| 2021MNRAS.508.3569K \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.508.3569K Spectral and temporal properties of ultra-luminous X-ray source NGC 55 ULX1 \|Jithesh V. \| MNRAS \| 509-5166 \| 2022 \| 2022MNRAS.509.5166J \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.509.5166J A transient ultraluminous X-ray source in NGC 55 \|Robba A. Pinto C. et al. \| MNRAS \| 515-4669 \| 2022 \| 2022MNRAS.515.4669R \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.515.4669R Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1 \|Barra F. Pinto C. et al. \| MNRAS \| 516-3972 \| 2022 \| 2022MNRAS.516.3972B \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.516.3972B
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2020-05-24T21:26:17Z/2020-05-26T10:19:37Z
Version	18.02_20200221_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	2021-07-22T00:00:00Z
Last Update	2025-01-27
Keywords	"harder xray continuum", "optically thick", "perform time", "130 xmm", "xmm newton", "wind spectroscopy", "XMM-Newton", "spectral shape", "xray flux", "NGC 55", "winds vary", "relativistic winds", "super eddington accretion", "disc xray photons", "XMM", "transitional object", "soft ulx", "ultraluminous xray sources"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Ciro Pinto, 2021, 'Understanding state transitions in ULXs: diagnostics through wind spectroscopy', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-idtrrv0