| Proposal ID | 087081 |
| Title | X-RAY SPECTRUM OF A PERIODIC QUASAR FROM THE DES: TESTING THE BINARY BLACK HOLE |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0870810101 |
| DOI | https://doi.org/10.57780/esa-eyd02od |
| Principal Investigator, PI | Prof Xin Liu |
| Abstract | We propose joint NuSTAR-XMM-Newton observations of a periodically variablequasar recently found from the Dark Energy Survey (DES). The target is uniquebecause its periodicity is highly significant and robust thanks to the sensitiveDES imaging and a ~20-yr long time baseline by combining DES with SDSS. The highsensitivity and long baseline are both crucial to rejecting false positivescaused by quasars stochastic red noise variability. The proposed X-rayobservations will test and distinguish two generic but different sets of modelsof circumbinary accretion disk simulations (a central cavity vs. minidisks),which predict dramatically different X-ray fluxes. The results will provide anindependent and complementary test for the binary black hole hypothesis to explain the periodicity. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2020-08-02T14:35:55Z/2020-08-03T08:14:00Z |
| 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 | 2021-08-27T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "sensitive des imaging", "nustar xmm newton", "central cavity", "periodic quasar", "complementary test", "XMM-Newton", "xray fluxes", "rejecting false positives", "x ray spectrum", "SDSS", "NuSTAR", "periodically variable quasar", "XMM", "binary black hole", "distinguish generic", "time baseline", "binary blackhole hypothesis" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Xin Liu, 2021, 'X-RAY SPECTRUM OF A PERIODIC QUASAR FROM THE DES: TESTING THE BINARY BLACK HOLE', 21.51_20241115_1113, European Space Agency, https://doi.org/10.57780/esa-eyd02od |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |