Abstract
Intermediate polars are a major fraction of all cataclysmic variables detected by INTEGRAL in hard X-ray. These objects have recently been proposed to be the dominant X-ray source population detected near the Galactic centre, and they also contribute significantly to X-ray diffuse Galactic ridge emission. Nevertheless, only 25% of all known intermediate polars have been detected in hard X-ray. This fact can be related to the activity state of these close interacting binaries.A multi-frequency (from optical to X-ray) investigation of intermediate polars is essential for understanding the physical mechanisms responsible for the observed activity of these objects.
Highlights
Cataclysmic variables (CVs) manifest strong activity in a whole spectrum from radio up to γ-rays
CVs are close binary systems consisting of a hot white dwarf (WD) and a red main-sequence star of spectral type M or K, which fills the volume of its inner Roche lobe and transfers matter to the vicinity of the WD [1]
As we showed in our previous analysis [5], the broadband spectra (3–100 keV) of the studied intermediate polars (IPs) can be well fitted by a thermal bremsstrahlung model with post-shock region (PSR) temperature kT ≈ (20–25) keV
Summary
Cataclysmic variables (CVs) manifest strong activity in a whole spectrum from radio up to γ-rays. Increased interest in CVs was aroused after the discovery of the very hard X-ray emission (up to 80 keV) of many IPs. When the transferred material impacts the WD atmosphere, a strong shock will form above its surface [3]. In the case of V2400 Oph, a significant emission excess detected at ≈ 26 keV can be caused by the reflection of X-rays from the surface of the WD [5]. 32 CVs (and 2 symbiotic systems) were detected in the data of INTEGRAL [7,8,9, 5]. We used all publicly available observational data from INTEGRAL/JEM-X and INTEGRAL/IBIS to study possible variability of the selected IPs in the hard X-ray and soft γ-ray spectral bands. The libraries grid.py and ms_suite.py developed by FM were used for the data processing and preparation of the final mosaics
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