A dataset provided by the European Space Agency

Name: The Coolest X-ray Emitting White Dwarfs?
Published: 2010-06-30T00:00:00Z

Proposal ID	060092
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=0600920201 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0600920301
DOI	https://doi.org/10.5270/esa-s7hwycb
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 within 1 of super-soft ROSATAll-Sky Survey (RASS) sources. WDs at these relatively low temperatures (below23,000 K) are not expected to be X-ray emitters, but the SDSS photometric andspectroscopic data fail to identify any other obvious optical counterparts tothe RASS sources to the SDSS limits (g~23 mag in photometry). We propose 6 ksecXMM-Newton observations of these three SDSS WDs to obtain pinpoint X-raypositions and improved flux measures for these objects. If XMM data confirm thatthe WDs are X-ray sources, they will be of great interest; in particular,theoretical work will be required to explain how such cool WDs can emit X rays.
Publications	An XMM-Newton Survey of the Soft X-Ray Background. II. An All-Sky Catalog of Diffuse O VII and O VIII Emission Intensities \|Henley David B. Shelton Robin L. \| ApJS \| 202-14 \| 2012 \| 2012ApJS..202...14H \| http://ui.adsabs.harvard.edu/#abs/2012ApJS..202...14H Stellar tidal disruption candidates found by cross-correlating the ROSAT Bright Source Catalogue and XMM-Newton observations \|Khabibullin I. Sazonov S. \| MNRAS \| 444-1041 \| 2014 \| 2014MNRAS.444.1041K \| http://ui.adsabs.harvard.edu/#abs/2014MNRAS.444.1041K Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift \|Yershov V. N. \| Ap&SS \| 354-97 \| 2014 \| 2014Ap&SS.354...97Y \| http://ui.adsabs.harvard.edu/#abs/2014Ap&SS.354...97Y XMM-Newton publication statistics \|Ness J.-U. Parmar A. N. et al. \| AN \| 335-210 \| 2014 \| 2014AN....335..210N \| http://ui.adsabs.harvard.edu/#abs/2014AN....335..210N The Tight Relation between X-Ray and Ultraviolet Luminosity of Quasars \|Lusso E. Risaliti G. \| ApJ \| 819-154 \| 2016 \| 2016ApJ...819..154L \| http://ui.adsabs.harvard.edu/#abs/2016ApJ...819..154L The Interaction of the Fermi Bubbles with the Milky Ways Hot Gas Halo \|Miller Matthew J. Bregman Joel N. \| ApJ \| 829-9 \| 2016 \| 2016ApJ...829....9M \| http://ui.adsabs.harvard.edu/#abs/2016ApJ...829....9M 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 A new sample of X-ray selected narrow emission-line galaxies. II. Looking for True Seyfert 2 \|Pons E. Watson M. G. \| A&A \| 594-72 \| 2016 \| 2016A&A...594A..72P \| http://ui.adsabs.harvard.edu/#abs/2016A&A...594A..72P An X-Ray- and SZ-bright Diffuse Source toward M31: A Local Hot Bridge \|Qu Zhijie Huang Rui et al. \| ApJ \| 907-14 \| 2021 \| 2021ApJ...907...14Q \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...907...14Q A Luminous X-Ray Transient in SDSS J143359.16+400636.0: A Likely Tidal Disruption Event \|Brightman Murray Ward Charlotte et al. \| ApJ \| 909-102 \| 2021 \| 2021ApJ...909..102B \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...909..102B The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars \|Zhou Min-Hua Gu Min-Feng \| RAA \| 21-4 \| 2021 \| 2021RAA....21....4Z \| http://ui.adsabs.harvard.edu/#abs/2021RAA....21....4Z 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 The Solar Cycle Temporal Variation of the Solar Wind Charge Exchange X-Ray Lines \|Qu Zhijie Koutroumpa Dimitra et al. \| ApJ \| 930-21 \| 2022 \| 2022ApJ...930...21Q \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...930...21Q X-ray emission from a rapidly accreting narrow-line Seyfert 1 galaxy at z = 6.56 \|Wolf J. Nandra K. et al. \| A&A \| 669-127 \| 2023 \| 2023A&A...669A.127W \| http://ui.adsabs.harvard.edu/#abs/2023A&A...669A.127W 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
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2009-05-26T21:50:53Z/2009-06-14T15:02:35Z
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	2010-06-30T00:00:00Z
Last Update	2025-01-27
Keywords	"spectroscopic data fail", "xmm newton", "relatively low temperatures", "SDSS", "super soft rosat", "emit xray", "optical counterparts", "pinpoint xray positions", "rass sources", "sdss wds", "XMM-Newton", "xray sources", "sdss photometric", "cool wds", "cool das", "xmm data", "sdss limits", "ROSAT", "XMM", "improved flux measures", "xray emitters"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Marcel Agueros, 2010, 'The Coolest X-ray Emitting White Dwarfs?', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-s7hwycb