A dataset provided by the European Space Agency

Name 069305
Title Unexplained Hard X-ray Emission from Hot Single White Dwarfs
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0693050401
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0693050501
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0693050601

DOI 10.5270/esa-fky7p29
Author Prof You-Hua Chu
Description The central star of the Helix Nebula, WD2226-210, is a hot white dwarf (WD). Its X-ray emission has a soft photospheric component and a harder component peaking near 1 keV, which cannot be explained, as it does not have a binary companion or fast stellar wind. Only one other single WD, KPD0005+5106, shows similar X-ray characteristics unambiguously, while two PG1159-type WDs have tentative detections of hard X-rays. We request 300 ks XMM observations of WD2226, using RGS spectra to determine the temperature, abundances, and ionization equilibrium of the X-ray-emitting plasma, and using EPIC data to study the temporal variations of the 1 keV emission. We also request short observations of the other three WDs to characterize their hard X-ray emission, and assess its physical implications.
Publication The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Identification of AGN in the XMM-Newton X-ray survey of the SMC . Maitra, Chandreyee, Haberl, Frank, et all. . A&A . 622-29 . 2019 . 2019A&A...622A..29M ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2012-11-26T01:33:54Z/2013-01-01T02:39:19Z
Version 17.56_20190403_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 2014-01-19T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2014-01-19T00:00:00Z, 069305, 17.56_20190403_1200. https://doi.org/10.5270/esa-fky7p29