A dataset provided by the European Space Agency

Proposal ID 006494
Title XMM Study of the 401Hz Accreting Pulsar SAX J1808.4-3658 in Quiescence
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https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0064940101

DOI https://doi.org/10.5270/esa-uyxc8iy
Principal Investigator, PI Dr Luigi Stella
Abstract We propose to carry out the first detailed study of the quiescent state of 401Hz pulsar in the soft X-ray transient SAX J1808.4-3658. A recent BeppoSAX observation has detected the source at a quiescent level of 10+33 ergs s-1. The proposed observations will address a number of crucial issues that this unique source can help answering with unprecedented accuracy. These include: (i) the characteristics and origin of the quiescent X-ray emission; (ii) the presence of coherent pulsations in the quiescent state; (iii) the physical regime that characterises the quiescent state, i.e. the propeller vs radio pulsar regime, the possible r^ance of the neutron star cooling, the presence of an ADAF. The XMM instrumentation is ideally suited for this a study.
Publications
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2001-03-24T00:02:53Z/2001-03-24T11:01:42Z
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 2002-06-11T00:00:00Z
Keywords "xmm instrumentation", "neutron star cooling", "XMM", "J1808.4", "physical regime", "coherent pulsations", "BeppoSAX", "radio pulsar regime", "quiescent xray emission", "quiescent level", "401hz pulsar"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr Luigi Stella, 2002, 'XMM Study of the 401Hz Accreting Pulsar SAX J1808.4-3658 in Quiescence', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-uyxc8iy