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NuSTAR and Swift observations of the fast rotating magnetized white dwarf AE Aquarii

Kitaguchi, Takao and An, Hongjun and Beloborodov, Andrei M. and Gotthelf, Eric V. and Hayashi, Takayuki and Kaspi, Victoria M. and Rana, Vikram R. and Boggs, Steven E. and Christensen, Finn E. and Craig, William W. and Hailey, Charles J. and Harrison, Fiona A. and Stern, Daniel and Zhang, Will W. (2014) NuSTAR and Swift observations of the fast rotating magnetized white dwarf AE Aquarii. Astrophysical Journal, 782 (1). Art. No. 3. ISSN 0004-637X. doi:10.1088/0004-637X/782/1/3.

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AE Aquarii is a cataclysmic variable with the fastest known rotating magnetized white dwarf (P_(spin) = 33.08 s). Compared to many intermediate polars, AE Aquarii shows a soft X-ray spectrum with a very low luminosity (L X ~ 10^(31) erg s^(–1)). We have analyzed overlapping observations of this system with the NuSTAR and the Swift X-ray observatories in 2012 September. We find the 0.5-30 keV spectra to be well fitted by either an optically thin thermal plasma model with three temperatures of 0.75^(+0.18)_(-0.45), 2.29^(+0.96)_(-0.82), and 9.33^(+6.07)_(-2.18) keV, or an optically thin thermal plasma model with two temperatures of 1.00^(+0.34)_(-0.23) and 4.64^(+1.58)_(-0.84) keV plus a power-law component with photon index of 2.50^(+0.17)_(-0.23). The pulse profile in the 3-20 keV band is broad and approximately sinusoidal, with a pulsed fraction of 16.6% ± 2.3%. We do not find any evidence for a previously reported sharp feature in the pulse profile.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Gotthelf, Eric V.0000-0003-3847-3957
Kaspi, Victoria M.0000-0001-9345-0307
Rana, Vikram R.0000-0003-1703-8796
Boggs, Steven E.0000-0001-9567-4224
Christensen, Finn E.0000-0001-5679-1946
Harrison, Fiona A.0000-0003-2992-8024
Stern, Daniel0000-0003-2686-9241
Zhang, Will W.0000-0002-1426-9698
Additional Information:© 2014 American Astronomical Society. Received 2013 October 31; accepted 2013 December 17; published 2014 January 17. This work was supported under NASA Contract No. NNG08FD60C, and 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 and the Swift Operations team 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 (Caltech, USA) and the XRT Data Analysis Software (XRTDAS) developed under the responsibility of ASDC. T.K. was supported by Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Young Scientists (B) (No. 24740185). Facilities: NuSTAR, Swift
Group:NuSTAR, Space Radiation Laboratory
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)24740185
Subject Keywords:accretion, accretion disks; novae, cataclysmic variables; stars: individual (AE Aquarii); white dwarfs; X-rays: stars
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2014-69
Issue or Number:1
Record Number:CaltechAUTHORS:20140417-103033745
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Official Citation:NuSTAR and Swift Observations of the Fast Rotating Magnetized White Dwarf AE Aquarii Takao Kitaguchi et al. 2014 ApJ 782 3
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45004
Deposited By: Ruth Sustaita
Deposited On:17 Apr 2014 18:08
Last Modified:10 Nov 2021 16:59

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