| Name | 086551 |
| Title | Verifying A Neutron-Star UCXB Candidate with A Possibly 10.2-min Orbital Period |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0865510101 |
| DOI | https://doi.org/10.57780/esa-9f3nfdc |
| Author | Dr Hang Gong |
| Description | We have discovered a previously unnoticed X-ray source 3.2 ^{circ} away from the Galactic Center. Its XMM-MOS light curve has a periodic variability at 614.28s( approx 3.8 sigma ). Its X-ray spectrum is perfectly described by an absorbed 1.8keV blackbody plus Fe-line features. It has an L_{mathrm{X}} about 1.2times10^{34}times (D-10 kpc) ^{2} erg s ^{-1} and has no obvious optical counterpart(fx-fo > 1600). We argue it is most likely a neutron-star ultra-compact X-ray binary with the shortest orbital period so far. We propose an XMM-PN observation to constrain its nature by: 1) verifying the 614s signal and looking for a possible rotational period, 2)checking its new spectral shape and whether other spectral components exist with more X-ray photons. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2021-03-02T21:31:10Z/2021-03-03T14:59:30Z |
| Version | 18.02_20200221_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 | 2022-04-06T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2022-04-06T00:00:00Z, 086551, 18.02_20200221_1200. https://doi.org/10.57780/esa-9f3nfdc |