NICER observation list: Target ID 258501

Abstract

The launch of NICER brings unprecedented capabilities for observing magnetic cataclysmic variables ( polars'). Quasi-periodic oscillations (QPOs) of 1-3 s have been observed with fast optical photometry. Existing hydrodynamic models of the accretion unify the source spectrum with predictions for a 2-channel (X-ray and optical) QPO. The X-ray QPO has never been detected, but observing capabilities have been limited. We propose NICER observations of the five polars that have exhibited optical QPOs, complemented by optical coverage from SAAO, both for cross correlation of variability and to understand source state changes. The campaign will compare both the spectral and temporal aspects with models. Detecting even one X-ray QPO would be an enormous advance.
Obsid RA DEC l b Start End Exposure Number of
Modules
Number of
Processing
Status of
Processing
Date of
Processing
Public
date
2585010101 123.782 -19.056 239.654 8.715 58578.8794 58578.8981 1383.0 52 2 VALIDATED 58582.8 58592
2585010201 123.779 -19.055 239.653 8.714 58579.8466 58579.8646 1325.0 52 2 VALIDATED 58585.9 58593
2585010301 123.778 -19.054 239.652 8.714 58581.8536 58581.8623 469.0 52 1 VALIDATED 58586.0 58595
2585010401 123.781 -19.055 239.654 8.715 58583.8391 58583.8602 1637.0 52 2 VALIDATED 58587.9 58597