Gamma-ray astronomy

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Millihertz X-ray variability during the 2019 outburst of black hole candidate Swift~J1357.2$-$0933

(2023)

Authors:

Aru Beri, Vishal Gaur, Phil Charles, David RA Williams, Jahanvi, John A Paice, Poshak Gandhi, Diego Altamirano, Rob Fender, David A Green, David Titterington
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Key Science Goals for the Next-Generation Event Horizon Telescope

Galaxies MDPI 11:3 (2023) 61

Authors:

Michael D Johnson, Kazunori Akiyama, Lindy Blackburn, Katherine L Bouman, Avery E Broderick, Vitor Cardoso, Rob P Fender, Christian M Fromm, Peter Galison, José L Gómez, Daryl Haggard, Matthew L Lister, Andrei P Lobanov, Sera Markoff, Ramesh Narayan, Priyamvada Natarajan, Tiffany Nichols, Dominic W Pesce, Ziri Younsi, Andrew Chael, Koushik Chatterjee, Ryan Chaves, Juliusz Doboszewski, Richard Dodson, Sheperd S Doeleman, Jamee Elder, Garret Fitzpatrick, Kari Haworth, Janice Houston, Sara Issaoun, Yuri Y Kovalev, Aviad Levis, Rocco Lico, Alexandru Marcoci, Niels CM Martens, Neil M Nagar, Aaron Oppenheimer, Daniel CM Palumbo, Angelo Ricarte, María J Rioja, Freek Roelofs, Ann C Thresher, Paul Tiede, Jonathan Weintroub, Maciek Wielgus
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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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Search for the evaporation of primordial black holes with H.E.S.S.

Journal of Cosmology and Astroparticle Physics IOP Publishing 2023:04 (2023) 040

Authors:

F Aharonian, F Ait Benkhali, J Aschersleben, M Böttcher, M Backes, V Barbosa Martins, R Batzofin, Y Becherini, D Berge, B Bi, C Boisson, J Bolmont, M de Bony de Lavergne, J Borowska, F Bradascio, R Brose, F Brun, B Bruno, T Bulik, C Burger-Scheidlin, S Caroff, S Casanova, J Celic, M Cerruti, T Chand, A Chen, O Chibueze, G Cotter, J Damascene Mbarubucyeye, A Djannati-Ataï, K Egberts, C van Eldik, J-P Ernenwein, M Füßling, A Fiasson, G Fichet de Clairfontaine, G Fontaine, S Gabici, S Ghafourizadeh, G Giavitto, D Glawion, JF Glicenstein, G Grolleron, M-H Grondin, L Haerer, M Haupt, JA Hinton, W Hofmann, M Holler, D Horns, Z-Q Huang, M Jamrozy, F Jankowsky, V Joshi, I Jung-Richardt, E Kasai, K Katarzyński, B Khélifi, S Klepser, W Kluźniak, N Komin, K Kosack, D Kostunin, TL Holch, RG Lang, S Le Stum, F Leitl, A Lemière, J-P Lenain, F Leuschner, T Lohse, A Luashvili, I Lypova, J Mackey, D Malyshev, V Marandon, P Marchegiani, P Marinos, G Martí-Devesa, R Marx, A Mitchell, R Moderski, L Mohrmann, A Montanari, E Moulin, J Muller, K Nakashima, M de Naurois, J Niemiec, P O'Brien, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, G Pühlhofer, S Panny, M Panter, RD Parsons, G Peron, A Priyana Noel, DA Prokhorov, H Prokoph, M Punch, A Quirrenbach, P Reichherzer, O Reimer, F Rieger, G Rowell, B Rudak, H Rueda Ricarte, V Sahakian, H Salzmann, DA Sanchez, A Santangelo, M Sasaki, HM Schutte, U Schwanke, JNS Shapopi, H Sol, A Specovius, S Spencer, Ł Stawarz, R Steenkamp, S Steinmassl, C Steppa, I Sushch, H Suzuki, T Takahashi, T Tanaka, T Tavernier, C Thorpe-Morgan, N Tsuji, Y Uchiyama, M Vecchi, J Veh, C Venter, J Vink, SJ Wagner, R White, A Wierzcholska, YW Wong, M Zacharias, D Zargaryan, AA Zdziarski, A Zech, S Zouari, N Żywucka, The HESS collaboration
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