| Proposal ID | 086551 |
| Title | Verifying A Neutron-Star UCXB Candidate with A Possibly 10.2-min Orbital Period |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0865510101 |
| DOI | https://doi.org/10.57780/esa-9f3nfdc |
| Principal Investigator, PI | Dr Hang Gong |
| Abstract | We have discovered a previously unnoticed X-ray source 3.2 ^{\circ} away fromthe Galactic Center. Its XMM/MOS light curve has a periodic variability at614.28s( \approx 3.8 \sigma ). Its X-ray spectrum is perfectly described by anabsorbed 1.8keV blackbody plus Fe-line features. It has an L_{\mathrm{X}} about 1.2\times10^{34}\times (D/10 kpc) ^{2} erg s ^{-1} and has no obviousoptical counterpart(fx/fo > 1600). We argue it is most likely a neutron-starultra-compact X-ray binary with the shortest orbital period so far. We proposean XMM/PN observation to constrain its nature by\: 1) verifying the 614s signaland looking for a possible rotational period, 2)checking its new spectral shapeand whether other spectral components exist with more X-ray photons. |
| Publications |
|
| 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 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 | 2022-04-06T00:00:00Z |
| Keywords | "$^{\ circ }$", "optical counterpartfx", "perfectly described", "$\ sigma $.", "mos light curve", "fo $>$ 1600", "times10 ^{", "periodic variability", "orbital period", "614s signal", "XMM", "28s $\", "xray spectrum", "xray photons", "spectral shape", "x }}$", "}$ erg", "spectral components exist", "shortest orbital period", "unnoticed xray source", "galactic center", "l_ {\ mathrm", "rotational period" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Hang Gong, 2022, 'Verifying A Neutron-Star UCXB Candidate with A Possibly 10.2-min Orbital Period', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-9f3nfdc |