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Diffuse sources, clustering, and the excess anisotropy of the radio synchrotron background

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 523:4 (2023) 5034-5046

Authors:

FJ Cowie, AR Offringa, BK Gehlot, J Singal, S Heston, S Horiuchi, DM Lucero

Abstract:

ABSTRACT We present the largest low frequency (120 MHz) arcminute resolution image of the radio synchrotron background (RSB) to date, and its corresponding angular power spectrum of anisotropies (APS) with angular scales ranging from 3° to 0.3 arcmin. We show that the RSB around the north celestial pole has a significant excess anisotropy power at all scales over a model of unclustered point sources based on source counts of known source classes. This anisotropy excess, which does not seem attributable to the diffuse Galactic emission, could be linked to the surface brightness excess of the RSB. To better understand the information contained within the measured APS, we model the RSB varying the brightness distribution, size, and angular clustering of potential sources. We show that the observed APS could be produced by a population of faint clustered point sources only if the clustering is extreme and the size of the Gaussian clusters is ≲1 arcmin. We also show that the observed APS could be produced by a population of faint diffuse sources with sizes ≲1 arcmin, and this is supported by features present in our image. Both of these cases would also cause an associated surface brightness excess. These classes of sources are in a parameter space not well probed by even the deepest radio surveys to date.
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Discovery of an Extremely Intermittent Periodic Radio Source

(2023)

Authors:

MP Surnis, KM Rajwade, BW Stappers, G Younes, MC Bezuidenhout, M Caleb, LN Driessen, F Jankowski, M Malenta, V Morello, S Sanidas, E Barr, M Kramer, R Fender, P Woudt
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First detection of X-ray polarization from the accreting neutron star 4U 1820-303

(2023)

Authors:

Alessandro Di Marco, Fabio La Monaca, Juri Poutanen, Thomas D Russell, Alessio Anitra, Ruben Farinelli, Guglielmo Mastroserio, Fabio Muleri, Fei Xie, Matteo Bachetti, Luciano Burderi, Francesco Carotenuto, Melania Del Santo, Tiziana Di Salvo, Michal Dovciak, Andrea Gnarini, Rosario Iaria, Jari JE Kajava, Kuan Liu, Riccardo Middei, Stephen L O'Dell, Maura Pilia, John Rankin, Andrea Sanna, Jakob van den Eijnden, Martin C Weisskopf, Anna Bobrikova, Fiamma Capitanio, Enrico Costa, Philip Kaaret, Alessio Marino, Paolo Soffitta, Francesco Ursini, Filippo Ambrosino, Massimo Cocchi, Sergio Fabiani, Herman L Marshall, Giorgio Matt, Sara Elisa Motta, Alessandro Papitto, Luigi Stella, Antonella Tarana, Silvia Zane, Ivan Agudo, Lucio A Antonelli, Luca Baldini, Wayne H Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolo Bucciantini, Simone Castellano, Elisabetta Cavazzuti, Chien-Ting Chen, Stefano Ciprini, Alessandra De Rosa, Ettore Del Monte, Laura Di Gesu, Niccolo Di Lalla, Immacolata Donnarumma, Victor Doroshenko, Steven R Ehlert, Teruaki Enoto, Yuri Evangelista, Riccardo Ferrazzoli, Javier A Garcia, Shuichi Gunji, Kiyoshi Hayashida, Jeremy Heyl, Wataru Iwakiri, Svetlana G Jorstad, Vladimir Karas, Fabian Kislat, Takao Kitaguchi, Jeffery J Kolodziejczak, Henric Krawczynski, Luca Latronico, Ioannis Liodakis, Simone Maldera, Alberto Manfreda, Frederic Marin, Andrea Marinucci, Alan P Marscher, Francesco Massaro, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Michela Negro, Chi-Yung Ng, Nicola Omodei, Chiara Oppedisano, George G Pavlov, Abel L Peirson, Matteo Perri, Melissa Pesce-Rollins, Pierre-Olivier Petrucci, Andrea Possenti, Simonetta Puccetti, Brian D Ramsey, Ajay Ratheesh, Oliver J Roberts, Roger W Romani, Carmelo Sgrò, Patrick Slane, Gloria Spandre, Douglas A Swartz, Toru Tamagawa, Fabrizio Tavecchio, Roberto Taverna, Yuzuru Tawara, Allyn F Tennant, Nicholas E Thomas, Francesco Tombesi, Alessio Trois, Sergey S Tsygankov, Roberto Turolla, Jacco Vink, Kinwah Wu
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Seeing sharper and deeper: JWST’s first glimpse of the photometric and spectroscopic properties of galaxies in the epoch of reionization

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 523:3 (2023) 3423-3440

Authors:

James AA Trussler, Nathan J Adams, Christopher J Conselice, Leonardo Ferreira, Duncan Austin, Rachana Bhatawdekar, Joseph Caruana, Brenda L Frye, Tom Harvey, Christopher C Lovell, Massimo Pascale, William J Roper, Aprajita Verma, Aswin P Vijayan, Stephen M Wilkins
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Diffuse Sources, Clustering and the Excess Anisotropy of the Radio Synchrotron Background

ArXiv 2306.00829 (2023)

Authors:

FJ Cowie, AR Offringa, BK Gehlot, J Singal, S Heston, S Horiuchi, DM Lucero
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