| Proposal ID | 086316 |
| Title | Nitrogen Abundance and the Hot Blackbody Puzzle of Intermediate Polars |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0863160101 |
| DOI | https://doi.org/10.57780/esa-tdrgf9n |
| Principal Investigator, PI | Dr Koji Mukai |
| Abstract | V2731 Oph is an intermediate polar with a complex X-ray spectrum including a hot(kT~100 eV) blackbody component, according to a previous short XMM-Newtonobservation, indicative of a locally super-Eddington accretion rate. However, itis possible that the temperature measurement was incorrect because V2731 Oph isoverabundant in nitrogen, which went unnoticed in the previous analysis due tothe lack of high S/N RGS spectrum. If overabundance is confirmed, it can bothsolve the hot blackbody puzzle and have important implications on the pastevolutionary history of V2731 Oph. We therefore propose a much longer XMM-Newtonobservation to obtain high quality RGS data. We also request a simultaneousNuSTAR observation to break potential degeneracies among soft and hard component parameters. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2020-09-05T12:17:22Z/2020-09-06T06:25:12Z |
| Version | 21.51_20241115_1113 |
| 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 | 2021-10-03T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "intermediate polars", "hard component parameters", "XMM-Newton", "v2731 oph", "hot kt", "NuSTAR", "XMM", "short xmm newton", "ev blackbody component", "temperature measurement", "intermediate polar", "past evolutionary history", "rgs spectrum", "complex xray spectrum", "hot blackbody", "nitrogen abundance", "quality rgs data", "break potential degeneracies", "xmm newton" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Koji Mukai, 2021, 'Nitrogen Abundance and the Hot Blackbody Puzzle of Intermediate Polars', 21.51_20241115_1113, European Space Agency, https://doi.org/10.57780/esa-tdrgf9n |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |