A dataset provided by the European Space Agency

Name: The Coolest X-ray Emitting White Dwarfs?
Published: 2009-04-15T00:00:00Z

Proposal ID	050355
Title	The Coolest X-ray Emitting White Dwarfs?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503550201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503550701
DOI	https://doi.org/10.5270/esa-g4lnep8
Principal Investigator, PI	Dr Marcel Agueros
Abstract	Among the ~6000 new white dwarfs (WDs) spectroscopically confirmed by the SloanDigital Sky Survey (SDSS) are three cool DAs and two cool DBs within 1 ofsuper-soft ROSAT All Sky Survey (RASS) sources. WDs at these relatively lowtemperatures (<23,000K) are not expected to be X-ray emitters, but the SDSSphotometric and spectroscopic data fail to identify any other obvious opticalcounterparts to the RASS sources to the SDSS limits (g~23 mag in photometry). Wepropose 5 ksec XMM-Newton observations of these five SDSS WDs to obtain pinpointX-ray positions and improved flux measures for these objects. If XMM dataconfirm that the five WDs are X-ray sources, they will be of great interest; inparticular, theoretical work will be required to explain how such cool WDs can emit X rays.
Publications	A serendipitous XMM survey of the SDSS: the evolution of the colour-magnitude diagram of X-ray AGN from z= 0.8 to 0.1 \|Georgakakis Antonis Nandra K. \| MNRAS \| 414-992 \| 2011 \| 2011MNRAS.414..992G \| http://ui.adsabs.harvard.edu/#abs/2011MNRAS.414..992G The cosmological analysis of X-ray cluster surveys - II. Application of the CR-HR method to the XMM archive \|Clerc N. Sadibekova T. et al. \| MNRAS \| 423-3561 \| 2012 \| 2012MNRAS.423.3561C \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.423.3561C Obscuration-dependent Evolution of Active Galactic Nuclei \|Buchner Johannes Georgakakis Antonis et al. \| ApJ \| 802-89 \| 2015 \| 2015ApJ...802...89B \| http://ui.adsabs.harvard.edu/#abs/2015ApJ...802...89B SPIDERS: the spectroscopic follow-up of X-ray selected clusters of galaxies in SDSS-IV \|Clerc N. Merloni A. et al. \| MNRAS \| 463-4490 \| 2016 \| 2016MNRAS.463.4490C \| http://ui.adsabs.harvard.edu/#abs/2016MNRAS.463.4490C 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 X-Ray-Emitting Stars Identified from the ROSAT All-Sky Survey and the Sloan Digital Sky Survey \|Agueros Marcel A. Anderson Scott F. et al. \| ApJS \| 181-444 \| 2009 \| 2009ApJS..181..444A \| http://ui.adsabs.harvard.edu/#abs/2009ApJS..181..444A X-ray properties of the X-CLASS-redMaPPer galaxy cluster sample: the luminosity-temperature relation \|Molham Mona Clerc Nicolas et al. \| MNRAS \| 494-161 \| 2020 \| 2020MNRAS.494..161M \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.494..161M A Comparison of X-Ray Photon Indices among the Narrow- and Broad-line Seyfert 1 Galaxies \|Ojha Vineet Chand Hum et al. \| ApJ \| 896-95 \| 2020 \| 2020ApJ...896...95O \| http://ui.adsabs.harvard.edu/#abs/2020ApJ...896...95O Multiwavelength classification of X-ray selected galaxy cluster candidates using convolutional neural networks \|Kosiba Matej Lieu Maggie et al. \| MNRAS \| 496-4141 \| 2020 \| 2020MNRAS.496.4141K \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.496.4141K SPIDERS: overview of the X-ray galaxy cluster follow-up and the final spectroscopic data release \|Clerc N. Kirkpatrick C. C. et al. \| MNRAS \| 497-3976 \| 2020 \| 2020MNRAS.497.3976C \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.497.3976C 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 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 Search for Young Stellar Objects within 4XMM-DR13 Using CatBoost and SPE \|Ma Xiangyao Zhang Yanxia et al. \| AJ \| 168-210 \| 2024 \| 2024AJ....168..210M \| http://ui.adsabs.harvard.edu/#abs/2024AJ....168..210M 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	2008-03-11T13:46:47Z/2008-03-11T17:55:44Z
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	2009-04-15T00:00:00Z
Last Update	2025-08-04
Keywords	"improved flux measures", "super soft rosat", "cool wds", "sdss limits", "relatively low temperatures", "optical counterparts", "cool dbs", "xmm data", "XMM", "sdss wds", "sdss photometric", "emit xray", "spectroscopic data fail", "xmm newton", "SDSS", "rass sources", "XMM-Newton", "cool das", "xray sources", "ROSAT", "xray emitters", "pinpoint xray positions"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Marcel Agueros, 2009, 'The Coolest X-ray Emitting White Dwarfs?', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-g4lnep8