A dataset provided by the European Space Agency

Name 088396
Title Understanding state transitions in ULXs: wind spectroscopy of ULX bright states


DOI https://doi.org/10.5270/esa-[xxxxxxx]
Author Dr Ciro Pinto
Description In recent work done with XMM-Newton, we have discovered that ultraluminous X-ray sources (ULXs) have powerful winds in agreement with theoretical predictions of super-Eddington accretion. Such winds vary on short timescales and can temporarily block and reprocess the disc X-ray photons, thus changing the spectral shape of the source. Enhanced X-ray variability is seen during ULX highest states including flux dips in soft ULXs and flares in hard ones, possibly due to a variable wind in our line of sight. We propose to test this, by studying the hard NGC 4559 X-7 and the soft NGC 55 ULX-1. 130ks XMM-Newton observation per object triggered during a high state will enable us to perform time--flux-resolved X-ray spectroscopy and probe the transition between soft, intermediate, and hard states.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN
Temporal Coverage 2021-12-12T05:21:21Z/2021-12-12T07:21:31Z
Version 19.16_20210326_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 2022-01-04T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2022-01-04T00:00:00Z, 088396, 19.16_20210326_1200. https://doi.org/10.5270/esa-[xxxxxxx]