A pair production telescope for medium-energy gamma-ray polarimetry

Hunter, S. D.; Bloser, Peter F.; Depaola, G.; Dion, Michael P.; deNolfo, G. A.; Hanu, Andrei R.; Iparraguirre, M.L.; Legere, Jason S.; Longo, F.; McConnell, Mark L.; Nowicki, S.; Ryan, J. M.; Son, Seunghee; Stecker, F. W.

doi:10.1016/j.astropartphys.2014.04.002

Cited by 77 publications

(66 citation statements)

References 85 publications

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“…For medium-energy gamma-rays, other physical effects, including the nuclear recoil, limit the ultimate angular resolution of any nuclear pair-production telescope. The angular resolution is unlikely to improve by more than a factor of a few in future instruments (Bernard et al 2014;Wu et al 2014;Hunter et al 2014). Jets can be well resolved in the radio band down to sub parsec scales.…”

Section: History and Challengesmentioning

confidence: 99%

Resolving the High-Energy Universe With Strong Gravitational Lensing: The Case of PKS 1830–211

Barnacka

Geller

Dell’Antonio

et al. 2015

ApJ

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Gravitational lensing is a potentially powerful tool for elucidating the origin of gamma-ray emission from distant sources. Cosmic lenses magnify the emission from distance sources and produce time delays between mirage images. Gravitationally-induced time delays depend on the position of the emitting regions in the source plane. The Fermi/LAT telescope continuously monitors the entire sky and detects gamma-ray flares, including those from gravitationally-lensed blazars. Therefore, temporal resolution at gamma-ray energies can be used to measure these time delays, which, in turn, can be used to resolve the origin of the gamma-ray flares spatially. We provide a guide to the application and Monte Carlo simulation of three techniques for analyzing these unresolved light curves: the Autocorrelation Function, the Double Power Spectrum, and the Maximum Peak Method. We apply these methods to derive time delays from the gamma-ray light curve of the gravitationally-lensed blazar PKS 1830-211. The result of temporal analysis combined with the properties of the lens from radio observations yield an improvement in spatial resolution at gamma-ray energies by a factor of 10000. We analyze four active periods. For two of these periods, the emission is consistent with origination from the core and for the other two, the data suggest that the emission region is displaced from the core by more that ∼ 1.5 kpc. For the core emission, the gamma-ray time delays, 23 ± 0.5 days and 19.7 ± 1.2 days, are consistent with the radio time delay 26 +4 −5 days.

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Section: History and Challengesmentioning

confidence: 99%

Resolving the High-Energy Universe With Strong Gravitational Lensing: The Case of PKS 1830–211

Barnacka

Geller

Dell’Antonio

et al. 2015

ApJ

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“…For the high energy emission, Zhang & Böttcher (2013) have shown that by combining the infrared/optical and the X-ray/γ-ray polarization signatures, it would be possible to distinguish the two models. Several X-ray and γ-ray polarimeters are currently proposed and/or under development (e.g., Hunter et al 2014). However, despite remarkable progress that has been made to improve these high-energy polarimeters, they commonly suffer from limited sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Radiation and Polarization Signatures of the 3d Multizone Time-Dependent Hadronic Blazar Model

Zhang

Diltz

Böttcher

2016

ApJ

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We present a newly developed time-dependent three-dimensional multi-zone hadronic blazar emission model. By coupling a Fokker-Planck based leptohadronic particle evolution code 3DHad with a polarization-dependent radiation transfer code, 3DPol, we are able to study the time-dependent radiation and polarization signatures of a hadronic blazar model for the first time. Our current code is limited to parameter regimes in which the hadronic γ-ray output is dominated by proton synchrotron emission, neglecting pion production. Our results demonstrate that the time-dependent flux and polarization signatures are generally dominated by the relation between the synchrotron cooling and the light crossing time scale, which is largely independent of the exact model parameters. We find that unlike the low-energy polarization signatures, which can vary rapidly in time, the high-energy polarization signatures appear stable. As a result, future high-energy polarimeters may be able to distinguish such signatures from the lower and more rapidly variable polarization signatures expected in leptonic models.

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“…These searches have been quite successful, suggesting that the LAT's utility as a seed for radio searches is given by the same performance parameters as the source detection sensitivity. 4. Pulsar Timing and Modeling.…”

Section: Galactic Sourcesmentioning

confidence: 99%

Scientific motivations and technical design considerations for future high-energy gamma-ray telescopes in light of lessons learned from the Fermi Large Area Telescope

Charles

2014

SPIE Proceedings

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Five years into the Fermi Gamma-ray Space Telescope (Fermi ) mission we have learned a great deal about the γ-ray sky, yet many open questions remain, and many new puzzles have arisen. In this contribution we will consider the science drivers for a variety of topics in high-energy gamma-ray astronomy, and how these drivers map into design considerations for future gamma-ray instruments in the energy range above 5 MeV. Specifically, we take the performance parameters and data set of the Large Area Telescope on the Fermi observatory (Fermi -LAT) as a baseline, and consider the scientific questions that could be probed by improving those parameters. We will also discuss the current state of detector technologies used in space-based γ-ray telescopes and discuss the magnitude of advances that would be required to make a future Fermi -like mission transformational enough to warrant the cost and effort. These summaries are intended to be useful for selecting technologies and making basic design decisions for future γ-ray telescopes.

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A pair production telescope for medium-energy gamma-ray polarimetry

Cited by 77 publications

References 85 publications

Resolving the High-Energy Universe With Strong Gravitational Lensing: The Case of PKS 1830–211

Resolving the High-Energy Universe With Strong Gravitational Lensing: The Case of PKS 1830–211

Radiation and Polarization Signatures of the 3d Multizone Time-Dependent Hadronic Blazar Model

Scientific motivations and technical design considerations for future high-energy gamma-ray telescopes in light of lessons learned from the Fermi Large Area Telescope

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