A dataset provided by the European Space Agency

Name 065505
Title Discovery of a QPO in the NGC55 ULX?
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0655050101

DOI 10.5270/esa-czkxp53
Author Dr GULAB DEWANGAN
Description We request a long (125ks) XMM-Newton observation of the ULX in the nearby galaxy NGC55. Previous short observations have revealed several unique aspects of this ULX. The temporal behavior of the ULX suggests a QPO at 1.5mHz and a power spectrum break. Such temporal features have been observed only for three other ULXs. Moreover, the source undergoes frequent spectral transitions making it a unique ULX where characteristic temporal behavior can be studied in conjunction with spectral transitions. Such studies are crucial to understanding the differences-similarities between ULX and Galactic X-ray binaries. Furthermore, the ULX exhibits a series of strange and unexplained X-ray dips of duration ~200s, whose nature can be revealed in spectral analysis of co-added dip data.
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The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Pulsator-like Spectr...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2010-05-24T07:25:00Z/2010-05-25T18:48:57Z
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 2011-06-16T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2011-06-16T00:00:00Z, 065505, 17.56_20190403_1200. https://doi.org/10.5270/esa-czkxp53