A dataset provided by the European Space Agency

Name: Verifying A Neutron-Star UCXB Candidate with A Possibly 10.2-min Orbital Period
Published: 2022-04-06T00:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

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 $1.2times10^{34}times$(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	Discovery of a Compact X-Ray Object with a 614 s Periodicity in the Direction of the Galactic Center \|Gong Hang \| ApJ \| 933-240 \| 2022 \| 2022ApJ...933..240G \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...933..240G From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez Antonio C. \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R Periodicity from X-ray sources within the inner Galactic disk \|Mondal Samaresh Ponti Gabriele et al. \| A&A \| 686-A125 \| 2024 \| 2024A&A...686A.125M \| http://ui.adsabs.harvard.edu/#abs/2024A&A...686A.125M
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2021-03-02T21:31:10Z/2021-03-03T14:59:30Z
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	2022-04-06T00:00:00Z
Last Update	2026-06-19
Keywords	"28s $\", "l_ {\ mathrm", "fo $>$ 1600", "$\ sigma $.", "}$ erg", "galactic center", "x }}$", "614s signal", "spectral shape", "mos light curve", "$^{\ circ }$", "spectral components exist", "orbital period", "xray photons", "times10 ^{", "perfectly described", "optical counterpartfx", "unnoticed xray source", "shortest orbital period", "XMM", "rotational period", "periodic variability", "xray spectrum"
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', 21.51_20241115_1113, European Space Agency, https://doi.org/10.57780/esa-9f3nfdc
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.