The PoGO+ Balloon-Borne Hard X-ray Polarimetry Mission

Friis, M.; Kiss, Mózsi; Mikhalev, Victor; Pearce, Mark; Takahashi, H.

doi:10.3390/galaxies6010030

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…Recently, we used the balloon-borne PoGO+ telescope (Friis et al 2018) to observe the hard X-ray (19-181 keV) linear polarization of Cyg X-1 in the hard state. This energy range is suitable to study the corona emission reflected by the disk.…”

Section: Introductionmentioning

confidence: 99%

PoGO+ polarimetric constraint on the synchrotron jet emission of Cygnus X-1

Chauvin

Florén

Jackson

et al. 2018

Monthly Notices of the Royal Astronomical Society: Letters

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We report a polarimetric constraint on the hard X-ray synchrotron jet emission from the Cygnus X-1 black-hole binary system. The observational data were obtained using the PoGO+ hard X-ray polarimeter in July 2016, when Cygnus X-1 was in the hard state. We have previously reported that emission from an extended corona with a low polarization fraction is dominating, and that the polarization angle is perpendicular to the disk surface. In the soft gamma-ray regime, a highly-polarized synchrotron jet is reported with INTEGRAL observations. To constrain the polarization fraction and flux of such a jet component in the hard X-ray regime, we now extend analyses through vector calculations in the Stokes QU plane, where the dominant corona emission and the jet component are considered simultaneously. The presence of another emission component with different polarization angle could partly cancel out the net polarization. The 90% upper limit of the polarization fraction for the additional synchrotron jet component is estimated as <10%, <5%, and <5% for polarization angle perpendicular to the disk surface, parallel to the surface, and aligned with the emission reported by INTEGRAL data, respectively. From the 20-180 keV total flux of 2.6 × 10 −8 erg s −1 cm −2 , the upper limit of the polarized flux is estimated as < 3 × 10 −9 erg s −1 cm −2 .

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Section: Introductionmentioning

confidence: 99%

PoGO+ polarimetric constraint on the synchrotron jet emission of Cygnus X-1

Chauvin

Florén

Jackson

et al. 2018

Monthly Notices of the Royal Astronomical Society: Letters

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“…Several γ−ray polarimeters are now in operation, such as the International Gamma-Ray Astrophysics Laboratory/IBIS (INTEGRAL/IBIS; Winkler et al 2003) and Hitomi (Aharonian et al 2018). Furthermore, several X-ray polarimeteres are now in commission e.g., AstroSat (Singh et al 2014), PoGo+ (Friis et al 2018) and X-Calibur (Kislat et al 2018). There will be a number of new X-ray polarimeters in near future, such as the Imaging X-ray Polarimetry Explorer (IXPE; Weisskopf et al 2014), the enhanced X-ray Timing and Polarimetry (eXTP; Zhang et al 2016) and the X-ray Polarization Probe (XPP).…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Polarization of Astrophysical Events with Precessing Jets

Lan

Xue

Xiong

et al. 2019

ApJ

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A central compact object (CCO, e.g. a black hole) with an accretion disk has been suggested as the common central engine of various astrophysical phenomena, such as gamma-ray bursts (GRBs), tidal disruption events (TDEs) and active galactic nuclei (AGNs). A jet powered by such a system might precess due to the misalignment of the angular momenta of the CCO and accretion disk. Some quasi-periodic behaviors observed in the light curves of these phenomena can be well interpreted within the framework of a precessing jet model. In this paper, we study the emission polarization of precessing jets in the three kinds of phenomena. The polarization angle also shows a gradual change for the synchrotron emission in both the random and toroidal magnetic field configurations with the precessing jet, while it can only change abruptly by 90 • for the non-precessing top-hat jet. Polarization properties are periodic due to the assumptions made in our model. The polarization observations are crucial to confirm the precession nature of jets in GRBs, TDEs and AGNs.

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“…PoGO+ Friis et al, 2018), a dedicated balloon borne hard X-ray polarimeter found the source to be unpolarized in its hard state (12 − 18 July 2016) in 20-180 keV (Chauvin et al, 2018a(Chauvin et al, , 2019. They placed an upper limit of 5.6 % at position angle of 154±31 • .…”

Section: Cygnus X-1mentioning

confidence: 99%

“…PoGO+ Friis et al, 2018) is a balloon-borne polarimetry mission, flown in 2016. It was optimized for pointing observation of Crab and Cygnus X-1.…”

Section: Array Of Low Z Scintillatorsmentioning

confidence: 99%

Hard X-ray Polarimetry -- An overview of the method, science drivers and recent findings

Chattopadhyay

2021

Preprint

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The last decade has seen a leapfrog in the interest in X-ray polarimetry with a number of new polarization measurements in hard X-rays from AstroSat, POLAR, GAP, and PoGO+. The measurements provide some interesting insights into various astrophysical phenomena such as coronal geometry and disk-jet connection in black hole X-ray binaries, hard X-ray emission mechanism in pulsars and Gamma Ray Bursts (GRB). They also highlight an increase in polarization with energy which makes hard X-ray polarimetry extremely appealing. There is a number of confirmed hard X-ray polarimetry experiments which along with the existing instruments (AstroSat and INTEGRAL) makes this field further exciting. Polarization experiments may also see a significant progress in sensitivity with new developments in scintillator readouts, active pixel sensors, CZT detectors. In particular, the advent of hard X-ray focusing optics, will enable designing of compact focal plane polarimeters with a multifold enhancement in sensitivity. In this review, we will focus on the recent polarimetry findings, science potential of hard X-ray polarimetry along with possible improvements in the measurement techniques.

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The PoGO+ Balloon-Borne Hard X-ray Polarimetry Mission

Cited by 18 publications

References 23 publications

PoGO+ polarimetric constraint on the synchrotron jet emission of Cygnus X-1

PoGO+ polarimetric constraint on the synchrotron jet emission of Cygnus X-1

Polarization of Astrophysical Events with Precessing Jets

Hard X-ray Polarimetry -- An overview of the method, science drivers and recent findings

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