| Proposal ID | 082205 |
| Title | RX J0812.4 3114: The Coolest Be X-ray Pulsar in Quiescence |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0822050101 |
| DOI | https://doi.org/10.5270/esa-4sct426 |
| Principal Investigator, PI | Dr Yue Zhao |
| Abstract | Be/X-ray pulsars in quiescence emit X-rays that may include thermal emissionfrom the hot NS surface, nonthermal emission from continued accretion, or X-raysfrom the hot winds of their optical companions. RX J0812.4 3114 is a Be X-raypulsar observed in quiescence by Chandra for 4.6 ks, with only a few photons. Abest-fit thermal NS atmosphere model to the Chandra data revealed an unusuallylow temperature and much larger inferred emission region radius compared toother quiescent systems of the same kind; however, the very low countingstatistics make it hard to robustly characterize the spectrum. We, therefore,propose an XMM observation to discriminate between a NS atmosphere model vs. athermal plasma model, search for pulsations, and unveil the nature of the X-ray emission. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2018-10-09T06:53:56Z/2018-10-10T03:00:36Z |
| 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 | 2019-10-29T23:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "hot ns surface", "thermal emission", "continued accretion", "nonthermal emission", "ns atmosphere model", "optical companions", "quiescence emit xray", "J0812.4", "quiescent systems", "xray emission", "low temperature", "x ray pulsars", "thermal plasma model", "hot winds", "rx j0812", "3114 \:", "xray pulsar", "chandra data", "XMM", "low counting statistics" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Yue Zhao, 2019, 'RX J0812.4 3114: The Coolest Be X-ray Pulsar in Quiescence', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-4sct426 |