| Name | 065505 |
| Title | Discovery of a QPO in the NGC55 ULX? |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0655050101 |
| DOI | https://doi.org/10.5270/esa-czkxp53 |
| Author | European Space Agency |
| 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 virgul200s, whose nature can be revealed in spectral analysis of co-added dip data. |
| Publication | No observations found associated with the current proposal |
| Instrument | EPN, RGS1, OM, RGS2, EMOS1, EMOS2 |
| 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, Discovery Of A Qpo In The Ngc55 Ulxquestionmark, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-czkxp53 |