Among the virgul6000 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 (gvirgul23 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
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
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
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
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.
European Space Agency, Dr Marcel Agueros, 2010, 'The Coolest X-ray Emitting White DwarfsquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-s7hwycb
