A dataset provided by the European Space Agency

Name 079062
Title DETERMINING THE NATURE OF THE BRIGHTEST SERENDIPITOUS NUSTAR SOURCE
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0790620101

DOI 10.5270/esa-ze042ws
Author Dr John Tomsick
Description In our systematic search for serendipitous sources (serendips) in the NuSTAR data, we have found a very bright (7.5 mCrab in the 2-10 keV band) serendip (J0923 s1) near the edge of one of the NuSTAR fields of view. The source has been previously detected in the soft X-ray band, but its nature is unknown. Based on its X-ray spectrum, its optical counterpart, and its long-term variability (as seen by MAXI), it must be Galactic, and, while some of its properties are suggestive of a magnetic Cataclysmic Variable, other properties cause problems with this interpretation. One interesting possibility is that it may be an accreting black hole with a high temperature disk. We propose NuSTAR and XMM-Newton observations to determine the nature of J0923 s1.
Publication Galactic Sources Detected in the NuSTAR Serendipitous Survey . Tomsick, John A., Lansbury, George B., et all. . ApJS . 230-25 . 2017 . 2017ApJS..230...25T ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2016-11-24T13:00:00Z/2016-11-24T19:23:20Z
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 2017-12-12T23:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2017-12-12T23:00:00Z, 079062, 17.56_20190403_1200. https://doi.org/10.5270/esa-ze042ws