| Proposal ID | 065567 |
| Title | Observing the unusual neutron star transient Swift J1749.4-2807 in quiescence |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0655670101 |
| DOI | https://doi.org/10.5270/esa-seugbl8 |
| Principal Investigator, PI | Mrs Nathalie Degenaar |
| Abstract | We propose a 50 ksec XMM-Newton observation of the transiently accreting neutronstar Swift J1749.4-2807 during its quiescent state. The soft X-ray behavior ofour target is highly unusual for transiently accreting X-ray binaries: after itexhibited a type-I X-ray burst, its 2-10 keV luminosity decreased by nearlythree orders of magnitude in about 1 day, all the way down to its quiescentlevel of ~1E33 erg/s. With our proposed observation we aim to investigate thepossibility that low-level accretion occurs by studying the quiescent spectralshape and searching for X-ray variability. It also allows us to constraincontributions from a thermal component, thereby probing a new parameter regimefor neutron star cooling models. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2011-03-19T16:24:22Z/2011-03-20T21:56:15Z |
| Version | 17.56_20190403_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 | 2012-04-12T00:00:00Z |
| Last Update | 2026-03-04 |
| Keywords | "xray variability", "J1749.4", "XMM", "xmm newton", "kev luminosity decreased", "quiescent spectral shape", "soft xray", "XMM-Newton", "constrain contributions", "thermal component", "quiescent level", "1e33 erg", "thereby probing", "xray burst", "parameter regime" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Mrs Nathalie Degenaar, 2012, 'Observing the unusual neutron star transient Swift J1749.4-2807 in quiescence', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-seugbl8 |