|Title||Pulse Phase Resolved Spectroscopy of 4U 1626-67 during the spin-up era|
|Author||Prof Biswajit Paul|
|Description||We propose 50ks observation of an accretion powered pulsar 4U 1626-67. The primary purpose is to study the variability of the emission lines as a function of pulse phase during the current spin-up era. Our pulse phase resolved spectroscopy of previous XMM-Newton observation during spin-down era revealed pulse phase dependence of the O-VII line at 0.568 keV by factor of ~4. We interpret that these variations are due to warps in the inner accretion disc induced by radiation pressure which is also believed to be the cause for spin-down. It is expected to show different line variability pattern during the spin-up phase which we aim to study. We will also do time resolved spectroscopy to study the behaviour of these low energy emission lines during the flares|
|Publication||Changes in the pulse phase dependence of X-ray emission lines in 4U 1626-67 with a torque reversal . Beri, Aru, Paul, Biswajit, . MNRAS . 475-999 . 2018 . 2018MNRAS.475..999B ,
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2016-10-16T22:00:00Z, 076486, 17.56_20190403_1200. https://doi.org/10.5270/esa-fyr2xuw|