A dataset provided by the European Space Agency

Name 013956
Title Study of the Globular Cluster Dip Source 4U1746-371 (NGC 6441)
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0139560101

DOI 10.5270/esa-4r0bnwk
Author Dr Arvind Parmar
Description We propose a 40 ks XMM-Newton observation of the dipping X-ray binary 4U1746-371 in the globular cluster NGC6441. This source exhibits highly energy independent dips, consistent with an abundance >150 times less than solar, which repeat every 5.7 hours, whereas the overall cluster abundance is only a factor 4-10 below solar. Resolving this discrepency using time-selected EPIC spectra is a prime goal. In addition, recent XMM-Newton observations of the dip source EXO0748-676 and MXB1659-298 have revealed a plethora of discrete spectral features such as absorptiona and emission lines, absorption edges and recombination continua which provide powerful diagnostic capabilities. A sensitive search for similar features from 4U1746-371 is our other prime goal.
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The diversi...
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 Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2003-10-13T00:00:00Z, 013956, 17.56_20190403_1200. https://doi.org/10.5270/esa-4r0bnwk