A dataset provided by the European Space Agency

Name 065447
Title The nature of quiescent emission in the neutron star Cen X-4
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0654470201
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0654470301
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0654470401
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0654470501

DOI 10.5270/esa-2m8a4xo
Author Dr Edward Cackett
Description The neutron star LMXB, Cen X-4, has been in quiescence since 1979. Its quiescent X-ray emission consists of both a thermal and power-law component, with variability observed on timescales as short as hundreds of seconds and as long as years. Yet, this variability is not understood. We recently found Cen X- 4 in a historically low-state, over 5 times fainter than before. Such a difference requires the thermal component to vary. This poses a big problem for using thermal emission to measure neutron star radii and constrain the dense matter equation of state. To investigate the nature of this variability and the emission mechanisms from X-rays through to the optical, we propose four, 12 ks observations of Cen X-4 to obtain good X-ray spectra and accurate photometry in 5 optical-UV filters.
Publication An X-ray-UV correlation in Cen X-4 during quiescence . Cackett, E. M., Brown, E. F., et all. . MNRAS . 433-1362 . 2013 . 2013MNRAS.433.1362C ,
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift . Yershov, V. N., . Ap&SS . 354-97 . 2014 . 2014Ap&SS.354...97Y ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2010-08-25T07:49:02Z/2011-01-31T20:56:23Z
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 2012-02-18T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2012-02-18T00:00:00Z, 065447, 17.56_20190403_1200. https://doi.org/10.5270/esa-2m8a4xo