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Title:
Polarized QPOs from the INTEGRAL polar IGRJ14536-5522 (=Swift J1453.4-5524)
Authors:
Potter, Stephen B.; Buckley, David A. H.; O'Donoghue, Darragh; Romero-Colmenero, Encarni; O'Connor, James; Fourie, Piet; Evans, Geoff; Sass, Craig; Crause, Lisa; Still, Martin; Butters, O. W.; Norton, A. J.; Mukai, Koji
Affiliation:
AA(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AB(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AC(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AD(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AE(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AF(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AG(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AH(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AI(South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape Town, South Africa), AJ(Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT; NASA Ames Research Center, Moffett Field, CA 94035, USA), AK(Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA; Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AL(Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA), AM(CRESST and X-ray Astrophysics Laboratory NASA/GSFC, Greenbelt, MD 20771, USA; Department of Physics, University of Maryland, Baltimore county, 1000 Hilltop Circle, Baltimore, MD 21250, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 2, pp. 1161-1170. (MNRAS Homepage)
Publication Date:
02/2010
Origin:
MNRAS
MNRAS Keywords:
accretion, accretion discs, methods: analytical, techniques: polarimetric, binaries: close, novae, cataclysmic variables, X-rays: stars
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2009.15944.x
Bibliographic Code:
2010MNRAS.402.1161P

Abstract

ABSTRACT We report optical spectroscopy and high-speed photometry and polarimetry of the INTEGRAL source IGRJ14536-5522 (=Swift J1453.4-5524). The photometry, polarimetry and spectroscopy are modulated on an orbital period of 3.1564(1) h. Orbital circularly polarized modulations are seen from ~0 to ~ -18 per cent, unambiguously identifying IGRJ14536-5522 as a polar. The negative circular polarization is seen over ~95 per cent of the orbit, which is consistent (as viewed from the Earth) with a single-pole accretor. We estimate some of the system parameters by modelling the polarimetric observations.

Some of the high-speed photometric data show modulations that are consistent with quasi-periodic oscillations (QPOs) on the order of 5-6 min. Furthermore, for the first time, we detect the (5-6) min QPOs in the circular polarimetry. We discuss the possible origins of these QPOs. In addition, we note that the source undergoes frequent changes between different accretion states.

We also include details of HIgh-speed Photo-POlarimeter (HIPPO), a new high-speed photo-polarimeter, used for some of our observations. This instrument is capable of high-speed, multi-filtered, simultaneous all-Stokes observations. It is therefore ideal for investigating rapidly varying astronomical sources such as magnetic cataclysmic variables.


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