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Constraints on axionlike particles from a combined analysis of three flaring Fermi flat-spectrum radio quasars

Physical Review D American Physical Society 107:8 (2023) 83027

Authors:

James Davies, Manuel Meyer, Garret Cotter

Abstract:

Many theories beyond the Standard Model of particle physics predict the existence of axionlike particles (ALPs) that mix with photons in the presence of a magnetic field. Searching for the effects of ALP-photon mixing in gamma-ray observations of blazars has provided some of the strongest constraints on ALP parameter space so far. Previously, only individual sources have been analyzed. We perform a combined analysis on Fermi Large Area Telescope data of three bright flaring flat-spectrum radio quasars, with the blazar jets themselves as the dominant mixing region. For the first time, we include a full treatment of photon-photon dispersion within the jet and account for the uncertainty in our B-field model by leaving the field strength free in the fitting. Overall, we find no evidence for ALPs but are able to exclude the ALP parameters 5 neV≲ma≲200 neV and gaγ≳5×10-12 GeV-1 with 95% confidence.
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Mass measurements and 3D orbital geometry of PSR J1933$-$6211

(2023)

Authors:

M Geyer, V Venkatraman Krishnan, PCC Freire, M Kramer, J Antoniadis, M Bailes, MCI Bernadich, S Buchner, AD Cameron, DJ Champion, A Karastergiou, MJ Keith, ME Lower, S Osłowski, A Possenti, A Parthasarathy, DJ Reardon, M Serylak, RM Shannon, R Spiewak, W van Straten, JPW Verbiest
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Radio Galaxy Zoo EMU: Towards a Semantic Radio Galaxy Morphology Taxonomy

ArXiv 2304.07171 (2023)

Authors:

Micah Bowles, Hongming Tang, Eleni Vardoulaki, Emma L Alexander, Yan Luo, Lawrence Rudnick, Mike Walmsley, Fiona Porter, Anna MM Scaife, Inigo Val Slijepcevic, Elizabeth AK Adams, Alexander Drabent, Thomas Dugdale, Gülay Gürkan, Andrew M Hopkins, Eric F Jimenez-Andrade, Denis A Leahy, Ray P Norris, Syed Faisal ur Rahman, Xichang Ouyang, Gary Segal, Stanislav S Shabala, O Ivy Wong
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Correction to: The C-Band All-Sky Survey (C-BASS): template fitting of diffuse galactic microwave emission in the northern sky

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 522:1 (2023) 151-151
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The C-Band All-Sky Survey (C-BASS): New Constraints on the Integrated Radio Spectrum of M 31

ArXiv 2304.03875 (2023)

Authors:

Stuart E Harper, Adam Barr, C Dickinson, MW Peel, Roke Cepeda-Arroita, CJ Copley, RDP Grumitt, J Patrick Leahy, JL Jonas, Michael E Jones, J Leech, TJ Pearson, ACS Readhead, Angela C Taylor
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