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Identifying IGR J14091-6108 as a magnetic CV with a massive white dwarf using X-ray and optical observations

Tomsick, John A. and Rahoui, Farid and Krivonos, Roman and Clavel, Maïca and Strader, Jay and Chomiuk, Laura (2016) Identifying IGR J14091-6108 as a magnetic CV with a massive white dwarf using X-ray and optical observations. Monthly Notices of the Royal Astronomical Society, 460 (1). pp. 513-523. ISSN 0035-8711. doi:10.1093/mnras/stw871.

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INTEGRAL Gamma-Ray (IGR) J14091−6108 is a Galactic X-ray source known to have an iron emission line, a hard X-ray spectrum, and an optical counterpart. Here, we report on X-ray observations of the source with XMM–Newton and NuSTAR as well as optical spectroscopy with European Southern Obseratory/Very Large Telescope and National Optical Astronomy Observatory/Southern Astrophysical Research Telescope. In the X-rays, this provides data with much better statistical quality than the previous observations, and this is the first report of the optical spectrum. Timing analysis of the XMM data shows a very significant detection of 576.3 ± 0.6 s period. The signal has a pulsed fraction of 30 ± 3 per cent in the 0.3–12 keV range and shows a strong drop with energy. The optical spectra show strong emission lines with significant variability in the lines and continuum, indicating that they come from an irradiated accretion disc. Based on these measurements, we identify the source as a magnetic cataclysmic variable of intermediate polar (IP) type where the white dwarf spin period is 576.3 s. The X-ray spectrum is consistent with the continuum emission mechanism being due to thermal bremsstrahlung, but partial covering absorption and reflection are also required. In addition, we use the IP mass model, which suggests that the white dwarf in this system has a high mass, possibly approaching the Chandrasekhar limit.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Tomsick, John A.0000-0001-5506-9855
Rahoui, Farid0000-0001-7655-4120
Krivonos, Roman0000-0003-2737-5673
Clavel, Maïca0000-0003-0724-2742
Strader, Jay0000-0002-1468-9668
Chomiuk, Laura0000-0002-8400-3705
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 April 11. Received 2016 April 11; in original form 2016 February 23. Published: 14 April 2016. We would like to thank D. Wik for help with using nuskybgd to produce a background spectrum for NuSTAR. We also thank C. Hailey, J. Hong, and F. Fornasini for useful discussions. FR thanks the ESO staff who performed the service observations. JAT acknowledges partial support from NASA under XMM Guest Observer grant NNX15AW09G. MC acknowledges partial support under NASA Contract NNG08FD60C for work on the NuSTAR mission. This work was partially supported by NASA Fermi grant NNX15AU83G. RK acknowledges support from Russian Science Foundation (grant 14-22-00271). This work made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. We thank the NuSTAR Operations, Software, and Calibration teams for support with the execution and analysis of these observations. This research has made use of the NuSTAR Data Analysis Software (NUSTARDAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). Based on observations obtained at the Southern Astrophysical Research (SOAR) telescope, which is a joint project of the Ministério da Ciência, Tecnologia, e Inovação (MCTI) da República Federativa do Brasil, the US National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU). This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in A&AS, 143, 23.
Funding AgencyGrant Number
Russian Science Foundation14-22-00271
Subject Keywords:stars: individual: IGR J14091−6108 – novae, cataclysmic variables – white dwarfs –X-rays: stars
Issue or Number:1
Record Number:CaltechAUTHORS:20160414-093817451
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Official Citation:John A. Tomsick, Farid Rahoui, Roman Krivonos, Maïca Clavel, Jay Strader, Laura Chomiuk; Identifying IGR J14091−6108 as a magnetic CV with a massive white dwarf using X-ray and optical observations, Monthly Notices of the Royal Astronomical Society, Volume 460, Issue 1, 21 July 2016, Pages 513–523,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66163
Deposited By: Joy Painter
Deposited On:14 Apr 2016 17:08
Last Modified:10 Nov 2021 23:54

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