Significant reflection and absorption effects in the X-ray emission of the Intermediate Polar IGR J17195-4100

Abstract

X-ray emission is from shock-heated plasma in magnetic cataclysmic variables, and is processed by absorption and scattering before reaching the observer. We investigate these effects in the X-ray emission of the Intermediate Polar IGR J17195-4100 by carrying out the X-ray spectral analysis, spin modulation and hardness ratio. We present high-sensitivity broadband X-ray spectral analysis by combining NuSTAR and XMM-Newton observations in the 0.3-78.0 keV energy range. The X-ray spectral analysis is performed using six composite models, including the angle-dependent reflection model (reflect), multi-temperature plasma emission models (CEVMKL, MKCFLOW), and photoionised and/or neutral partially covering absorption models (zxipcf, pcfabs) within XSPEC. We examine also the spin modulation in four energy ranges and the hardness ratio, to determine the absorption and scattering effects. We find that the spectrum is best modelled with a reflection amplitude ($\Omega$) of 0.58 ${}_{-0.26}^{+0.38}$, an ionisation parameter, log($\xi$), of 1.46${}_{-0.23}^{+0.44}$ with an equivalent hydrogen column density of 3.09${}_{-0.68}^{+2.26}$ $\times$ 10${}^{22}$ cm${}^{-2}$, a neutral absorber, and a multi-temperature plasma temperature of 27.14${}_{-2.13}^{+2.0}$ keV. In addition, we detect effects of electron scattering in the NuSTAR band, leading to modulation amplitude of about a steady 9$\%$ that increases up to 15$\%$ after 20 keV. We stress that these effects significantly affect the X-ray emission of intermediate polars and should be considered to obtain a good representation of the intrinsic spectrum.

arXiv comment10 Pages, 4 Figures, and 3 Tables, accepted to be published in the Astronomy & Astrophysics as it stands

References in corpus (35)

• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• X-ray Emissions from Accreting White Dwarfs: a Review
• Calibration of the NuSTAR High Energy Focusing X-ray Telescope
• On why the Iron K-shell absorption in AGN is not a signature of the local Warm/Hot Intergalactic Medium
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. V. Identification and properties of 21 southern hard X-ray sources
• 20-100 keV properties of cataclysmic variables detected in the INTEGRAL/IBIS survey
• White dwarf masses in intermediate polars observed with the Suzaku satellite
• Hard X-ray view on intermediate polars in the Gaia era
• Characterization of new hard X-ray Cataclysmic Variables
• Complex Absorption and Reflection of a Multi-temperature Cyclotron-Bremsstrahlung X-ray Cooling Shock in BY Cam
• Hard X-ray Cataclysmic Variables
• Identifications of Four INTEGRAL Sources in the Galactic Plane via Chandra Localizations
• Unambiguous Detection of Reflection in Magnetic Cataclysmic Variables: Joint NuSTAR-XMM-Newton Observations of Three Intermediate Polars
• Measuring the masses of magnetic white dwarfs: A NuSTAR Legacy Survey
• Time-resolved optical observations of five cataclysmic variables detected by INTEGRAL
• X-ray Orbital Modulations in Intermediate Polars
• BeppoSAX observations of the X-ray pulsar MAXI J1409-619 in low state: discovery of cyclotron resonance features
• XMM-Newton (X-Ray Mulit-Mirror Mission) Observatory
• RXTE determination of the intermediate polar status of XSS J00564+4548, IGR J17195-4100, and XSS J12270-4859
• Variations in the Cyclotron Resonant Scattering Features during 2011 outburst of 4U 0115+63
• Why does the intermediate polar V405 Aurigae show a double-peaked spin pulse?
• INTEGRAL view on Cataclysmic Variables and Symbiotic Binaries
• Suzaku Observation of the Intermediate Polar V1223 Sagittarii
• X-ray reflection from cold white dwarfs in magnetic cataclysmic variables
• Broadband X-ray spectrum of intermediate polar V1223 Sgr
• Constraining the accretion geometry of the intermediate polar EX Hya using NuSTAR, Swift and Chandra observations
• The role of complex ionized absorber in the soft X-ray spectra of Intermediate Polars
• HT Camelopardalis: The simplest intermediate polar spin pulse
• Application of a new X-ray reflection model to V1223 Sagittarii
• X-ray Observations of INTEGRAL Discovered Cataclysmic Variable IGR J17195-4100
• Comptonization as an origin of the continuum in Intermediate Polars
• Unravelling optical and X-ray properties of the disc-dominated intermediate polar IGR J15094-6649
• Study of Complex Absorption and Reflection in a Unique Intermediate Polar Paloma