Observations of 4U 1626-67 with the Imaging X-Ray Polarimetry Explorer
Journal
Date Issued
2022
Author(s)
Marshall, Herman L.
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Ng, Mason
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Rogantini, Daniele
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Heyl, Jeremy
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Tsygankov, Sergey S.
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Poutanen, Juri
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Zane, Silvia
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Agudo, Iván
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•
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Baldini, Luca
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Baumgartner, Wayne H.
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Bellazzini, Ronaldo
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Bianchi, Stefano
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Bongiorno, Stephen D.
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Bonino, Raffaella
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Brez, Alessandro
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•
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Castellano, Simone
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Cavazzuti, Elisabetta
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Ciprini, Stefano
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•
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Di Gesu, Laura
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Di Lalla, Niccolò
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Donnarumma, Immacolata
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Doroshenko, Victor
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Dovčiak, Michal
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Ehlert, Steven R.
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Enoto, Teruaki
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•
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Garcia, Javier A.
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Gunji, Shuichi
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Hayashida, Kiyoshi
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Iwakiri, Wataru
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Jorstad, Svetlana G.
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Karas, Vladimir
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Kitaguchi, Takao
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Kolodziejczak, Jeffery J.
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Krawczynski, Henric
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Latronico, Luca
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Liodakis, Ioannis
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Maldera, Simone
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Manfreda, Alberto
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Marin, Frédéric
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Marinucci, Andrea
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Marscher, Alan P.
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Mitsuishi, Ikuyuki
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Mizuno, Tsunefumi
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Ng, C. -Y.
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O'Dell, Stephen L.
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Omodei, Nicola
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Oppedisano, Chiara
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Pavlov, George G.
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Peirson, Abel L.
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Pesce-Rollins, Melissa
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Petrucci, Pierre-Olivier
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Puccetti, Simonetta
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Ramsey, Brian D.
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Romani, Roger W.
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Sgrò, Carmelo
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Slane, Patrick
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Spandre, Gloria
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Tamagawa, Toru
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Taverna, Roberto
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Tawara, Yuzuru
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Tennant, Allyn F.
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Thomas, Nicholas E.
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Turolla, Roberto
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Vink, Jacco
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Weisskopf, Martin C.
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Wu, Kinwah
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IXPE Collaboration
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Schulz, Norbert S.
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Chakrabarty, Deepto
Abstract
We present measurements of the polarization of X-rays in the 2-8 keV band from the pulsar in the ultracompact low-mass X-ray binary 4U 1626-67 using data from the Imaging X-Ray Polarimetry Explorer (IXPE). The 7.66 s pulsations were clearly detected throughout the IXPE observations as well as in the NICER soft X-ray observations, which we used as the basis for our timing analysis and to constrain the spectral shape over the 0.4-10 keV energy band. Chandra HETGS high-resolution X-ray spectra were also obtained near the times of the IXPE observations for firm spectral modeling. We found an upper limit on the pulse-averaged linear polarization of <4% (at 95% confidence). Similarly, there was no significant detection of polarized flux in pulse phase intervals when subdividing the bandpass by energy. However, spectropolarimetric modeling over the full bandpass in pulse phase intervals provided a marginal detection of polarization of the power-law spectral component at the 4.8% ± 2.3% level (90% confidence). We discuss the implications concerning the accretion geometry onto the pulsar, favoring two-component models of the pulsed emission....
Volume
940
Issue
1
Start page
70
Issn Identifier
0004-637X
Rights
open.access
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