|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 virgul4. 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||No observations found associated with the current proposal|
|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|