A dataset provided by the European Space Agency

Name: The X-ray spectrum of the unusual neutron star X-ray binary SAX J2224.9+5421
Published: 2014-07-02T00:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	072088
Title	The X-ray spectrum of the unusual neutron star X-ray binary SAX J2224.9+5421
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0720880101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0720880201
DOI	https://doi.org/10.5270/esa-0wkos1u
Principal Investigator, PI	Dr Nathalie Degenaar
Abstract	We propose a 50-ks XMM-Newton observation of the unusual neutron star X-raybinary SAX J2224.9+5421. Our target was discovered by BeppoSAX/WFC when itexhibited a thermonuclear X-ray burst. Follow-up observations aiming toconstrain the persistent emission were performed ~8 h later and detected thesource at a 0.5-10 keV luminosity of L_X~1E33 erg/s. This is very peculiar sinceneutron star X-ray binaries are generally considered to be in quiescence atluminosities of L_X~1E31-1E33 erg/s, while they display accretion outbursts withluminosities of L_X~1E34-1E38 erg/s. We propose for a detailed investigation ofthe X-ray spectrum of SAX J2224.9+5421 to gain insight into its nature andextraordinary behavior.
Publications	The Quiescent Counterpart of the Peculiar X-Ray Burster SAX J2224.9+5421 \|Degenaar N. Wijnands R. \| ApJ \| 787-67 \| 2014 \| 2014ApJ...787...67D \| http://ui.adsabs.harvard.edu/#abs/2014ApJ...787...67D The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch Eric W. \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F 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 Selection of Compton-thick AGN from a hard photometric sample using XMM-Newton observations \|Mostafa Reham Guainazzi Matteo \| MNRAS \| 525-5080 \| 2023 \| 2023MNRAS.525.5080M \| http://ui.adsabs.harvard.edu/#abs/2023MNRAS.525.5080M 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 Robust constraints on feebly interacting particles using XMM-Newton \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 973-L6 \| 2024 \| 2024ApJ...973L...6D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...973L...6D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2013-05-29T06:03:43Z/2013-05-30T00:05:37Z
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	2014-07-02T00:00:00Z
Last Update	2026-07-09
Keywords	"BeppoSAX", "1e31 1e33 erg", "gain insight", "XMM-Newton", "sax j2224", "persistent emission", "XMM", "kev luminosity", "display accretion outburst", "J2224.9", "xray spectrum", "1e34 1e38 erg", "thermonuclear xray burst", "1e33 erg", "xmm newton"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Nathalie Degenaar, 2014, 'The X-ray spectrum of the unusual neutron star X-ray binary SAX J2224.9+5421', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-0wkos1u
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.