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Classifying IGR J18007−4146 as an intermediate polar using XMM and NuSTAR.

Classifying IGR J18007−4146 as an intermediate polar using XMM and NuSTAR.

Authors :
Coughenour, Benjamin M
Tomsick, John A
Shaw, Aarran W
Mukai, Koji
Clavel, Maïca
Hare, Jeremy
Krivonos, Roman
Fornasini, Francesca M
Source :
Monthly Notices of the Royal Astronomical Society; Apr2022, Vol. 511 Issue 3, p4582-4589, 8p
Publication Year :
2022

Abstract

Many new and unidentified Galactic sources have recently been revealed by ongoing hard X-ray surveys. A significant fraction of these have been shown to be the type of accreting white dwarfs known as cataclysmic variables (CVs). Follow-up observations are often required to categorize and classify these sources, and may also identify potentially unique or interesting cases. One such case is IGR J18007−4146, which is likely a CV based on follow-up Chandra observations and constraints from optical/IR catalogues. Utilizing simultaneous XMM–Newton and NuSTAR observations, as well as the available optical/IR data, we confirm the nature of IGR J18007−4146 as an intermediate polar type CV. Timing analysis of the XMM data reveals a periodic signal at 424.4 ± 0.7 s that we interpret as the spin period of the white dwarf. Modelling the 0.3–78 keV spectrum, we use a thermal bremsstrahlung continuum but require intrinsic absorption as well as a soft component and strong Fe lines between 6 and 7 keV. We model the soft component using a single-temperature blackbody with |$kT = 73^{+8}_{-6}$|  eV. From the X-ray spectrum, we are able to measure the mass of the white dwarf to be |$1.06^{+0.19}_{-0.10}$|   |$\mathrm{ M}_{\mathord \odot }$|⁠ , which means IGR J18007−4146 is more massive than the average for magnetic CVs. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00358711
Volume :
511
Issue :
3
Database :
Complementary Index
Journal :
Monthly Notices of the Royal Astronomical Society
Publication Type :
Academic Journal
Accession number :
156006845
Full Text :
https://doi.org/10.1093/mnras/stac263