A dataset provided by the European Space Agency

Proposal ID 013956
Title Study of the Globular Cluster Dip Source 4U1746-371 (NGC 6441)
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https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0139560101

DOI https://doi.org/10.5270/esa-4r0bnwk
Principal Investigator, PI Dr Arvind Parmar
Abstract We propose a 40 ks XMM-Newton observation of the dipping X-ray binary 4U1746-371in the globular cluster NGC6441. This source exhibits highly energy independentdips, consistent with an abundance >150 times less than solar, which repeatevery 5.7 hours, whereas the overall cluster abundance is only a factor 4-10below solar. Resolving this discrepency using time-selected EPIC spectra is aprime goal. In addition, recent XMM-Newton observations of the dip sourceEXO0748-676 and MXB1659-298 have revealed a plethora of discrete spectralfeatures such as absorptiona and emission lines, absorption edges andrecombination continua which provide powerful diagnostic capabilities. Asensitive search for similar features from 4U1746-371 is our other prime goal.
Publications
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2002-09-19T11:54:06Z/2002-09-20T00:43:12Z
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 2003-10-13T00:00:00Z
Last Update 2025-01-27
Keywords "emission lines", "absorption edges", "EPIC", "powerful diagnostic", "epic spectra", "NGC 6441", "overall cluster abundance", "xmm newton", "recombination continua", "XMM-Newton", "globular cluster ngc6441", "XMM", "discrete spectral", "4u1746 371", "sensitive search", "mxb1659 298"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr Arvind Parmar, 2003, 'Study of the Globular Cluster Dip Source 4U1746-371 (NGC 6441)', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-4r0bnwk