2018/04/13 by D. Zengin Çamurdan, Dicle Zengin Çamurdan, Ş. Balman +6
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astrophysical Phenomena and Observations #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Pulsars and Gravitational Waves Research #astro-ph.HE
paper · pdf · doi:10.48550/arxiv.1804.04825
12 pages, 9 figures, 2 tables, accepted in MNRAS
arxiv created 2018/04/13 · openalex publication_date 2018/04/13 · arxiv updated 2018/04/16 · openalex created_date 2022/10/05 · openalex updated_date 2026/07/28
XY Ari is one of the few known eclipsing intermediate polars. We present results from a detailed analysis of an unpublished archival observation using XMM-Newton EPIC pn and MOS data in a quiescent state of XY Ari. The X-ray orbital modulation and spin pulse variations were investigated for energy dependent modulations in different energy bands. The broad orbital modulation observed with various observations was confirmed with XMM-Newton at hard X-ray (>1.6 keV). The EPIC light curves folded at the spin phases show a double peak profile as expected from two pole accretion. The pulse profile is found to be energy dependent. Hardness ratio variations and energy modulation depth during spin modulation can be explained by photoelectric absorption. The simultaneously fitted EPIC spectra with CEVMKL model yield maximum plasma temperature of 28+3.1-2.9 keV with an iron abundance Fe/Fe_\odot=0.37+0.06-0.05. We find two intrinsic partial covering absorption columns of 6.2+1.0-0.9 × 1022 and 105.3+35.4-30.4 × 1022 \mathrmcm-2 with covering fractions of 0.53+0.05-0.04, 0.41+0.14-0.13 respectively. In addition, a Gaussian emission line at 6.43+0.01-0.02 keV with an equivalent width of 51+12-10 eV is required to account for fluorescent emission from neutral iron. The X-ray luminosity of the source is 4.2 × 1032 \mathrmerg s-1 in the 0.2-10.0 keV energy band.