Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

(2025)

Authors:

LAT Collaboration, S Abdollahi, L Baldini, R Bellazzini, B Berenji, E Bissaldi, R Bonino, P Bruel, S Buson, E Charles, AW Chen, S Ciprini, M Crnogorcevic, A Cuoco, F D'Ammando, A de Angelis, M Di Mauro, N Di Lalla, L Di Venere, A Domínguez, SJ Fegan, A Fiori, P Fusco, V Gammaldi, F Gargano, D Gasparrini, F Giacchino, N Giglietto, M Giliberti, F Giordano, M Giroletti, IA Grenier, S Guiriec, M Gustafsson, E Hays, JW Hewitt, D Horan, H Katagiri, M Kuss, J Li, F Longo, F Loparco, L Lorusso, G Martí-Devesa, MN Mazziotta, JE McEnery, I Mereu, M Meyer, PF Michelson, N Mirabal, W Mitthumsiri, T Mizuno, A Morselli, IV Moskalenko, M Negro, N Omodei, M Orienti, E Orlando, G Panzarini, M Persic, M Pesce-Rollins, R Pillera, TA Porter, G Principe, S Rainò, R Rando, M Razzano, O Reimer, M Sánchez-Conde, PM Saz Parkinson, D Serini, DJ Suson, DF Torres, G Zaharijas, HAWC Collaboration, :, A Albert, R Alfaro, C Alvarez, JC Arteaga-Velázquez, D Avila Rojas, HA Ayala Solares, R Babu, E Belmont-Moreno, KS Caballero-Mora, T Capistrán, A Carramiñana, S Casanova, O Chaparro-Amaro, U Cotti, J Cotzomi, S Coutiño de León, E de la Fuente, C de León, R Diaz Hernandez, BL Dingus, MA DuVernois, M Durocher, JC Díaz-Vélez, K Engel, C Espinoza, KL Fan, N Fraija, JA García-González, F Garfias, MM González, JA Goodman, JP Harding, S Hernandez, I Herzog, J Hinton, D Huang, F Hueyotl-Zahuantitla, P Hüntemeyer, A Iriarte, V Joshi, S Kaufmann, D Kieda, GJ Kunde, A Lara, J Lee, H León Vargas, JT Linnemann, AL Longinotti, G Luis-Raya, J Lundeen, K Malone, O Martinez, J Martínez-Castro, H Martínez-Huerta, JA Matthews, P Miranda-Romagnoli, JA Morales-Soto, E Moreno, M Mostafá, A Nayerhoda, L Nellen, MU Nisa, R Noriega-Papaqui, L Olivera-Nieto, N Omodei, A Peisker, Y Pérez Araujo, EG Pérez-Pérez, CD Rho, D Rosa-González, H Salazar, D Salazar-Gallegos, A Sandoval, M Schneider, J Serna-Franco, AJ Smith, Y Son, RW Springer, O Tibolla, K Tollefson, I Torres, R Torres-Escobedo, R Turner, F Ureña-Mena, E Varela, L Villaseñor, X Wang, IJ Watson, K Whitaker, E Willox, S Yu, S Yun-Cárcamo, H Zhou, HESS Collaboration, :, F Aharonian, F Ait Benkhali, C Armand, J Aschersleben, M Backes, V Barbosa Martins, R Batzofin, Y Becherini, D Berge, B Bi, M Böttcher, C Boisson, J Bolmont, M de Bony de Lavergne, J Borowska, M Bouyahiaoui, F Bradascio, M Breuhaus, F Brun, B Bruno, T Bulik, C Burger-Scheidlin, S Caroff, S Casanova, R Cecil, J Celic, M Cerruti, T Chand, S Chandra, A Chen, J Chibueze, O Chibueze, G Cotter, S Dai, J Damascene Mbarubucyeye, A Dmytriiev, V Doroshenko, J-P Ernenwein, G Fichet de Clairfontaine, M Filipovic, G Fontaine, M Füßling, S Funk, S Gabici, S Ghafourizadeh, G Giavitto, D Glawion, JF Glicenstein, G Grolleron, L Haerer, JA Hinton, W Hofmann, TL Holch, M Holler, D Horns, M Jamrozy, F Jankowsky, A Jardin-Blicq, V Joshi, I Jung-Richardt, E Kasai, K Katarzyński, R Khatoon, B Khélifi, W Kluźniak, Nu Komin, D Kostunin, RG Lang, S Le Stum, F Leitl, A Lemière, M Lemoine-Goumard, J-P Lenain, F Leuschner, T Lohse, A Luashvili, I Lypova, J Mackey, D Malyshev, D Malyshev, V Marandon, P Marchegiani, R Marx, M Meyer, A Mitchell, R Moderski, A Montanari, E Moulin, K Nakashima, M de Naurois, J Niemiec, A Priyana Noel, L Oakes, P O'Brien, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, S Panny, M Panter, RD Parsons, V Poireau, DA Prokhorov, G Pühlhofer, A Quirrenbach, P Reichherzer, A Reimer, O Reimer, F Rieger, L Rinchiuso, G Rowell, B Rudak, V Sahakian, S Sailer, A Santangelo, M Sasaki, J Schäfer, 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, AM Taylor, R Terrier, C Thorpe-Morgan, C van Eldik, M Vecchi, J Veh, C Venter, J Vink, T Wach, SJ Wagner, A Wierzcholska, Yu Wun Wong, M Zacharias, D Zargaryan, AA Zdziarski, A Zech, S Zouari, N Żywucka, MAGIC Collaboration, :, H Abe, S Abe, VA Acciari, I Agudo, T Aniello, S Ansoldi, LA Antonelli, A Arbet Engels, C Arcaro, M Artero, K Asano, D Baack, A Babić, A Baquero, U Barres de Almeida, JA Barrio, I Batković, J Baxter, J Becerra González, W Bednarek, E Bernardini, M Bernardos, J Bernete, A Berti, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, I Burelli, G Busetto, A Campoy Ordaz, A Carosi, R Carosi, M Carretero-Castrillo, AJ Castro-Tirado, G Ceribella, Y Chai, A Cifuentes, S Cikota, E Colombo, JL Contreras, J Cortina, S Covino, G D'Amico, V D'Elia, P Da Vela, F Dazzi, A De Angelis, B De Lotto, A Del Popolo, M Delfino, J Delgado, C Delgado Mendez, D Depaoli, F Di Pierro, L Di Venere, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, G Emery, J Escudero, L Fariña, A Fattorini, L Foffano, L Font, S Fröse, S Fukami, Y Fukazawa, RJ García López, M Garczarczyk, S Gasparyan, M Gaug, JG Giesbrecht Paiva, N Giglietto, F Giordano, P Gliwny, N Godinović, R Grau, D Green, JG Green, D Hadasch, A Hahn, T Hassan, L Heckmann, J Herrera, D Hrupec, M Hütten, R Imazawa, T Inada, R Iotov, K Ishio, I Jiménez Martínez, J Jormanainen, D Kerszberg, GW Kluge, Y Kobayashi, PM Kouch, H Kubo, J Kushida, M Láinez Lezáun, A Lamastra, F Leone, E Lindfors, S Lombardi, F Longo, R López-Coto, M López-Moya, A López-Oramas, S Loporchio, A Lorini, B Machado de Oliveira Fraga, P Majumdar, M Makariev, G Maneva, N Mang, M Manganaro, S Mangano, K Mannheim, M Mariotti, M Martínez, A Mas-Aguilar, D Mazin, S Menchiari, S Mender, D Miceli, T Miener, JM Miranda, R Mirzoyan, M Molero González, E Molina, HA Mondal, A Moralejo, D Morcuende, C Nanci, V Neustroev, M Nievas Rosillo, C Nigro, K Nilsson, K Nishijima, T Njoh Ekoume, K Noda, S Nozaki, Y Ohtani, A Okumura, J Otero-Santos, S Paiano, M Palatiello, D Paneque, R Paoletti, JM Paredes, L Pavletić, M Persic, M Pihet, G Pirola, F Podobnik, PG Prada Moroni, E Prandini, G Principe, C Priyadarshi, W Rhode, M Ribó, J Rico, C Righi, N Sahakyan, T Saito, K Satalecka, FG Saturni, B Schleicher, K Schmidt, F Schmuckermaier, JL Schubert, T Schweizer, A Sciaccaluga, J Sitarek, V Sliusar, D Sobczynska, A Spolon, A Stamerra, J Strišković, D Strom, M Strzys, Y Suda, S Suutarinen, H Tajima, M Takahashi, R Takeishi, F Tavecchio, P Temnikov, K Terauchi, T Terzić, M Teshima, L Tosti, S Truzzi, A Tutone, S Ubach, J van Scherpenberg, M Vazquez Acosta, S Ventura, V Verguilov, I Viale, CF Vigorito, V Vitale, I Vovk, R Walter, M Will, C Wunderlich, T Yamamoto, VERITAS Collaboration, :, A Acharyya, CB Adams, A Archer, P Bangale, JT Bartkoske, P Batista, W Benbow, JH Buckley, Y Chen, JL Christiansen, AJ Chromey, M Errando, M Escobar Godoy, A Falcone, S Feldman, Q Feng, JP Finley, GM Foote, L Fortson, A Furniss, G Gallagher, C Giuri, W Hanlon, O Hervet, CE Hinrichs, J Hoang, J Holder, Z Hughes, TB Humensky, W Jin, MN Johnson, P Kaaret, M Kertzman, M Kherlakian, D Kieda, TK Kleiner, N Korzoun, F Krennrich, S Kumar, M Lundy, G Maier, CE McGrath, MJ Millard, J Millis, CL Mooney, P Moriarty, R Mukherjee, D Nieto, S O'Brien, RA Ong, M Pohl, E Pueschel, J Quinn, PL Rabinowitz, K Ragan, PT Reynolds, D Ribeiro, E Roache, JL Ryan, I Sadeh, L Saha, M Santander, GH Sembroski, R Shang, M Splettstoesser, D Tak, AK Talluri, JV Tucci, VV Vassiliev, A Weinstein, DA Williams, SL Wong

The peculiar hard state behaviour of the black hole X-ray binary Swift J1727.8−1613

Monthly Notices of the Royal Astronomical Society Oxford University Press 542:3 (2025) 1803-1816

Authors:

AK Hughes, F Carotenuto, TD Russell, AJ Tetarenko, JCA Miller-Jones, RM Plotkin, A Bahramian, JS Bright, FJ Cowie, J Crook-Mansour, R Fender, JK Khaulsay, A Kirby, S Jones, M McCollough, R Rao, GR Sivakoff, SD Vrtilek, DRA Williams-Baldwin, CM Wood, D Altamirano, P Casella, N Castro Segura, S Corbel, S Motta

Abstract:

Tracking the correlation between radio and X-ray luminosities during black hole X-ray binary outbursts is a key diagnostic of the coupling between accretion inflows (traced by X-rays) and relativistic jet outflows (traced by radio). We present the radio–X-ray correlation of the black hole low-mass X-ray binary Swift J1727.8–1613 during its 2023–2024 outburst. Our observations span a broad dynamic range, covering 4 orders of magnitude in radio luminosity and 6.5 in X-ray luminosity. This source follows an unusually radio-quiet track, exhibiting significantly lower radio luminosities at a given X-ray luminosity than both the standard (radio-loud) track and most previously known radio-quiet systems. Across most of the considered distance range (–4.3 kpc), Swift J1727.8–1613 appears to be the most radio-quiet black hole binary identified to date. For distances kpc, while Swift J1727 becomes comparable to one other extremely radio-quiet system, its peak X-ray luminosity ( erg s) exceeds that of any previously reported hard-state black hole low-mass X-ray binary, emphasizing the extremity of this outburst. Additionally, for the first time in a radio-quiet system, we identify the onset of X-ray spectral softening to coincide with a change in trajectory through the radio–X-ray plane. We assess several proposed explanations for radio-quiet behaviour in black hole systems in light of this data set. As with other such sources, however, no single mechanism fully accounts for the observed properties, highlighting the importance of regular monitoring and the value of comprehensive (quasi-)simultaneous data-sets.

New Metrics for Identifying Variables and Transients in Large Astronomical Surveys

(2025)

Authors:

Shih Ching Fu, Arash Bahramian, Aloke Phatak, James CA Miller-Jones, Suman Rakshit, Alexander Andersson, Robert Fender, Patrick A Woudt

Evidence for an intrinsic luminosity–decay correlation in GRB radio afterglows

Monthly Notices of the Royal Astronomical Society Oxford University Press 542:3 (2025) 2421-2430

Authors:

SPR Shilling, SR Oates, DA Kann, J Patel, JL Racusin, B Cenko, R Gupta, M Smith, L Rhodes, KR Hinds, M Nicholl, A Breeveld, M Page, M De Pasquale, B Gompertz

Abstract:

We present the discovery of a correlation, in a sample of 16 gamma-ray burst 8.5 GHz radio afterglows, between the intrinsic luminosity measured at 10 d in the rest frame, , and the average rate of decay past this time, . The correlation has a Spearman’s rank coefficient of at a significance of and a linear regression fit of . This finding suggests that more luminous radio afterglows have higher average rates of decay than less luminous ones. We use a Monte Carlo simulation to show the correlation is not produced by chance or selection effects at a confidence level of . Previous studies found this relation in optical/UV, X-ray, and GeV afterglow light curves, and we have now extended it to radio light curves. The Spearman’s rank coefficients and the linear regression slopes for the correlation in each waveband are all consistent within . We discuss how these new results in the radio band support the effects of observer viewing geometry, and time-varying microphysical parameters, as possible causes of the correlation as suggested in previous works.

A relativistic jet from a neutron star breaking out of its natal supernova remnant

(2025)

Authors:

KVS Gasealahwe, K Savard, IM Monageng, I Heywood, RP Fender, PA Woudt, J English, JH Matthews, H Whitehead, FJ Cowie, AK Hughes, P Saikia, SE Motta