The contribution of discrete sources to the sky temperature at 144 MHz

Astronomy and Astrophysics EDP Sciences 648 (2021) A10

Authors:

Mj Hardcastle, Tw Shimwell, C Tasse, Pn Best, A Drabent, Mj Jarvis, I Prandoni, Hja Roettgering, J Sabater, Dj Schwarz

Abstract:

In recent years, the level of the extragalactic radio background has become a point of considerable interest, with some lines of argument pointing to an entirely new cosmological synchrotron background. The contribution of the known discrete source population to the sky temperature is key to this discussion. Because of the steep spectral index of the excess over the cosmic microwave background, it is best studied at low frequencies where the signal is strongest. The Low-Frequency Array (LOFAR) wide and deep sky surveys give us the best constraints yet on the contribution of discrete extragalactic sources at 144 MHz, and in particular allow us to include contributions from diffuse, low-surface-brightness emission that could not be fully accounted for in previous work. We show that, even with these new data, known sources can still only account for around a quarter of the estimated extragalactic sky temperature at LOFAR frequencies.

Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign

The Astrophysical Journal Letters American Astronomical Society 911:1 (2021) l11

Authors:

The EHT MWL Science Working Group, JC Algaba, J Anczarski, K Asada, M Baloković, S Chandra, Y-Z Cui, AD Falcone, M Giroletti, C Goddi, K Hada, D Haggard, S Jorstad, A Kaur, T Kawashima, G Keating, J-Y Kim, M Kino, S Komossa, EV Kravchenko, TP Krichbaum, S-S Lee, R-S Lu, M Lucchini, S Markoff, J Neilsen, MA Nowak, J Park, G Principe, V Ramakrishnan, MT Reynolds, M Sasada, SS Savchenko, KE Williamson, The Event Horizon Telescope Collaboration, Kazunori Akiyama, Antxon Alberdi, Walter Alef, Richard Anantua, Rebecca Azulay, Anne-Kathrin Baczko, David Ball, John Barrett, Dan Bintley, Bradford A Benson, Lindy Blackburn, Raymond Blundell, Wilfred Boland, Katherine L Bouman, Geoffrey C Bower, Hope Boyce, Michael Bremer, Christiaan D Brinkerink, Roger Brissenden, Silke Britzen, Avery E Broderick, Dominique Broguiere, Thomas Bronzwaer, Do-Young Byun, John E Carlstrom, Andrew Chael, Chi-kwan Chan, Shami Chatterjee, Koushik Chatterjee, Ming-Tang Chen, Yongjun Chen, Paul M Chesler, Ilje Cho, Pierre Christian, John E Conway, James M Cordes, Thomas M Crawford, Geoffrey B Crew, Alejandro Cruz-Osorio, Jordy Davelaar, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Sheperd S Doeleman, Ralph P Eatough, Heino Falcke, Joseph Farah, Vincent L Fish, Ed Fomalont, H Alyson Ford, Raquel Fraga-Encinas, Per Friberg, Christian M Fromm, Antonio Fuentes, Peter Galison, Charles F Gammie, Roberto García, Olivier Gentaz, Boris Georgiev, Roman Gold, José L Gómez, Arturo I Gómez-Ruiz, Minfeng Gu, Mark Gurwell, Michael H Hecht, Ronald Hesper, Luis C Ho, Paul Ho, Mareki Honma, Chih-Wei L Huang, Lei Huang, David H Hughes, Shiro Ikeda, Makoto Inoue, Sara Issaoun, David J James, Buell T Jannuzi, Michael Janssen, Britton Jeter, Wu Jiang, Alejandra Jiménez-Rosales, Michael D Johnson, Taehyun Jung, Mansour Karami, Ramesh Karuppusamy, Mark Kettenis, Dong-Jin Kim, Jongsoo Kim, Junhan Kim, Jun Yi Koay, Yutaro Kofuji, Patrick M Koch, Shoko Koyama, Michael Kramer, Carsten Kramer, Cheng-Yu Kuo, Tod R Lauer, Aviad Levis, Yan-Rong Li, Zhiyuan Li, Michael Lindqvist, Rocco Lico, Greg Lindahl, Jun Liu, Kuo Liu, Elisabetta Liuzzo, Wen-Ping Lo, Andrei P Lobanov, Laurent Loinard, Colin Lonsdale, Nicholas R MacDonald, Jirong Mao, Nicola Marchili, Daniel P Marrone, Alan P Marscher, Iván Martí-Vidal, Satoki Matsushita, Lynn D Matthews, Lia Medeiros, Karl M Menten, Izumi Mizuno, Yosuke Mizuno, James M Moran, Kotaro Moriyama, Monika Moscibrodzka, Cornelia Müller, Gibwa Musoke, Alejandro Mus Mejías, Hiroshi Nagai, Neil M Nagar, Masanori Nakamura, Ramesh Narayan, Gopal Narayanan, Iniyan Natarajan, Antonios Nathanail, Roberto Neri, Chunchong Ni, Aristeidis Noutsos, Hiroki Okino, Héctor Olivares, Gisela N Ortiz-León, Tomoaki Oyama, Feryal Özel, Daniel CM Palumbo, Nimesh Patel, Ue-Li Pen, Dominic W Pesce, Vincent Piétu, Richard Plambeck, Aleksandar PopStefanija, Oliver Porth, Felix M Pötzl, Ben Prather, Jorge A Preciado-López, Dimitrios Psaltis, Hung-Yi Pu, Ramprasad Rao, Mark G Rawlings, Alexander W Raymond, Luciano Rezzolla, Angelo Ricarte, Bart Ripperda, Freek Roelofs, Alan Rogers, Eduardo Ros, Mel Rose, Arash Roshanineshat, Helge Rottmann, Alan L Roy, Chet Ruszczyk, Kazi LJ Rygl, Salvador Sánchez, David Sánchez-Arguelles, Tuomas Savolainen, F Peter Schloerb, Karl-Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Des Small, Bong Won Sohn, Jason SooHoo, He Sun, Fumie Tazaki, Alexandra J Tetarenko, Paul Tiede, Remo PJ Tilanus, Michael Titus, Kenji Toma, Pablo Torne, Tyler Trent, Efthalia Traianou, Sascha Trippe, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R van Rossum, Jan Wagner, Derek Ward-Thompson, John Wardle, Jonathan Weintroub, Norbert Wex, Robert Wharton, Maciek Wielgus, George N Wong, Qingwen Wu, Doosoo Yoon, André Young, Ken Young, Ziri Younsi, Feng Yuan, Ye-Fei Yuan, J Anton Zensus, Guang-Yao Zhao, Shan-Shan Zhao, The Fermi Large Area Telescope Collaboration, G Principe, M Giroletti, F D’Ammando, M Orienti, HESS Collaboration, H Abdalla, R Adam, F Aharonian, F Ait Benkhali, EO Angüner, C Arcaro, C Armand, T Armstrong, H Ashkar, M Backes, V Baghmanyan, V Barbosa Martins, A Barnacka, M Barnard, Y Becherini, D Berge, K Bernlöhr, B Bi, M Böttcher, C Boisson, J Bolmont, M de Bony de Lavergne, M Breuhaus, F Brun, P Brun, M Bryan, M Büchele, T Bulik, T Bylund, S Caroff, A Carosi, S Casanova, T Chand, A Chen, G Cotter, M Curyło, J Damascene Mbarubucyeye, ID Davids, J Davies, C Deil, J Devin, P deWilt, L Dirson, A Djannati-Ataï, A Dmytriiev, A Donath, V Doroshenko, C Duffy, J Dyks, K Egberts, F Eichhorn, S Einecke, G Emery, J-P Ernenwein, K Feijen, S Fegan, A Fiasson, G Fichet de Clairfontaine, G Fontaine, S Funk, M Füßling, S Gabici, YA Gallant, G Giavitto, L Giunti, D Glawion, JF Glicenstein, D Gottschall, M-H Grondin, J Hahn, M Haupt, G Hermann, JA Hinton, W Hofmann, C Hoischen, TL Holch, M Holler, M Hörbe, D Horns, D Huber, M Jamrozy, D Jankowsky, F Jankowsky, A Jardin-Blicq, V Joshi, I Jung-Richardt, E Kasai, MA Kastendieck, K Katarzyński, U Katz, D Khangulyan, B Khélifi, S Klepser, W Kluźniak, Nu Komin, R Konno, K Kosack, D Kostunin, M Kreter, G Lamanna, A Lemière, M Lemoine-Goumard, J-P Lenain, C Levy, T Lohse, I Lypova, J Mackey, J Majumdar, D Malyshev, D Malyshev, V Marandon, P Marchegiani, A Marcowith, A Mares, G Martí-Devesa, R Marx, G Maurin, PJ Meintjes, M Meyer, R Moderski, M Mohamed, L Mohrmann, A Montanari, C Moore, P Morris, E Moulin, J Muller, T Murach, K Nakashima, A Nayerhoda, M de Naurois, H Ndiyavala, F Niederwanger, J Niemiec, L Oakes, P O’Brien, H Odaka, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, M Panter, S Panny, RD Parsons, G Peron, B Peyaud, Q Piel, S Pita, V Poireau, A Priyana Noel, DA Prokhorov, H Prokoph, G Pühlhofer, M Punch, A Quirrenbach, R Rauth, P Reichherzer, A Reimer, O Reimer, Q Remy, M Renaud, F Rieger, L Rinchiuso, C Romoli, G Rowell, B Rudak, E Ruiz-Velasco, V Sahakian, S Sailer, DA Sanchez, A Santangelo, M Sasaki, M Scalici, HM Schutte, U Schwanke, S Schwemmer, M Seglar-Arroyo, M Senniappan, AS Seyffert, N Shafi, K Shiningayamwe, R Simoni, A Sinha, H Sol, A Specovius, S Spencer, M Spir-Jacob, Ł Stawarz, L Sun, R Steenkamp, C Stegmann, S Steinmassl, C Steppa, T Takahashi, T Tavernier, AM Taylor, R Terrier, D Tiziani, M Tluczykont, L Tomankova, C Trichard, M Tsirou, R Tuffs, Y Uchiyama, DJ van der Walt, C van Eldik, C van Rensburg, B van Soelen, G Vasileiadis, J Veh, C Venter, P Vincent, J Vink, HJ Völk, T Vuillaume, Z Wadiasingh, SJ Wagner, J Watson, F Werner, R White, A Wierzcholska, Yu Wun Wong, A Yusafzai, M Zacharias, R Zanin, D Zargaryan, AA Zdziarski, A Zech, SJ Zhu, J Zorn, S Zouari, N Żywucka, MAGIC Collaboration, VA Acciari, S Ansoldi, LA Antonelli, A Arbet Engels, M Artero, K Asano, D Baack, A Babić, A Baquero, U Barres de Almeida, JA Barrio, J Becerra González, W Bednarek, L Bellizzi, E Bernardini, M Bernardos, A Berti, J Besenrieder, W Bhattacharyya, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, G Busetto, R Carosi, G Ceribella, M Cerruti, Y Chai, A Chilingarian, S Cikota, SM Colak, 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, M Delfino, J Delgado, C Delgado Mendez, D Depaoli, F Di Pierro, L Di Venere, E Do Souto Espiñeira, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, V Fallah Ramazani, A Fattorini, G Ferrara, MV Fonseca, L Font, C Fruck, S Fukami, RJ García López, M Garczarczyk, S Gasparyan, M Gaug, N Giglietto, F Giordano, P Gliwny, N Godinović, JG Green, D Green, D Hadasch, A Hahn, L Heckmann, J Herrera, J Hoang, D Hrupec, M Hütten, T Inada, S Inoue, K Ishio, Y Iwamura, I Jiménez, J Jormanainen, L Jouvin, Y Kajiwara, M Karjalainen, D Kerszberg, Y Kobayashi, H Kubo, J Kushida, A Lamastra, D Lelas, F Leone, E Lindfors, S Lombardi, F Longo, R López-Coto, M López-Moya, A López-Oramas, S Loporchio, B Machado de Oliveira Fraga, C Maggio, P Majumdar, M Makariev, M Mallamaci, G Maneva, M Manganaro, K Mannheim, L Maraschi, M Mariotti, M Martínez, D Mazin, S Menchiari, S Mender, S Mićanović, D Miceli, T Miener, M Minev, JM Miranda, R Mirzoyan, E Molina, A Moralejo, D Morcuende, V Moreno, E Moretti, V Neustroev, C Nigro, K Nilsson, K Nishijima, K Noda, S Nozaki, Y Ohtani, T Oka, J Otero-Santos, S Paiano, M Palatiello, D Paneque, R Paoletti, JM Paredes, L Pavletić, P Peñil, C Perennes, M Persic, PG Prada Moroni, E Prandini, C Priyadarshi, I Puljak, W Rhode, M Ribó, J Rico, C Righi, A Rugliancich, L Saha, N Sahakyan, T Saito, S Sakurai, K Satalecka, FG Saturni, B Schleicher, K Schmidt, T Schweizer, J Sitarek, I Šnidarić, D Sobczynska, A Spolon, A Stamerra, D Strom, M Strzys, Y Suda, T Surić, M Takahashi, F Tavecchio, P Temnikov, T Terzić, M Teshima, L Tosti, S Truzzi, A Tutone, S Ubach, J van Scherpenberg, G Vanzo, M Vazquez Acosta, S Ventura, V Verguilov, CF Vigorito, V Vitale, I Vovk, M Will, C Wunderlich, D Zarić, VERITAS Collaboration, CB Adams, W Benbow, A Brill, M Capasso, JL Christiansen, AJ Chromey, MK Daniel, M Errando, KA Farrell, Q Feng, JP Finley, L Fortson, A Furniss, A Gent, C Giuri, T Hassan, O Hervet, J Holder, G Hughes, TB Humensky, W Jin, P Kaaret, M Kertzman, D Kieda, S Kumar, MJ Lang, M Lundy, G Maier, P Moriarty, R Mukherjee, D Nieto, M Nievas-Rosillo, S O’Brien, RA Ong, AN Otte, S Patel, K Pfrang, M Pohl, RR Prado, E Pueschel, J Quinn, K Ragan, PT Reynolds, D Ribeiro, GT Richards, E Roache, C Rulten, JL Ryan, M Santander, GH Sembroski, R Shang, A Weinstein, DA Williams, TJ Williamson, EAVN Collaboration, Tomoya Hirota, Lang Cui, Kotaro Niinuma, Hyunwook Ro, Nobuyuki Sakai, Satoko Sawada-Satoh, Kiyoaki Wajima, Na Wang, Xiang Liu, Yoshinori Yonekura

Commissioning the H i Observing Mode of the Beam Former for the Cryogenically Cooled Focal L-band Array for the GBT (FLAG)

The Astronomical Journal American Astronomical Society 161:4 (2021) 163

Authors:

NM Pingel, DJ Pisano, M Ruzindana, M Burnett, KM Rajwade, R Black, B Jeffs, KF Warnick, DR Lorimer, D Anish Roshi, R Prestage, MA McLaughlin, D Agarwal, T Chamberlin, L Hawkins, L Jensen, P Marganian, JD Nelson, W Shillue, E Smith, B Simon, V Van Tonder, S White

The VLA Frontier Field Survey: A Comparison of the Radio and UV/Optical Size of 0.3 ≲ z ≲ 3 Star-forming Galaxies

The Astrophysical Journal American Astronomical Society 910:2 (2021) 106

Authors:

EF Jiménez-Andrade, EJ Murphy, I Heywood, I Smail, K Penner, E Momjian, M Dickinson, L Armus, TJW Lazio

The VLA Frontier Fields Survey: Deep, High-resolution Radio Imaging of the MACS Lensing Clusters at 3 and 6 GHz

The Astrophysical Journal American Astronomical Society 910:2 (2021) 105

Authors:

I Heywood, EJ Murphy, EF Jiménez-Andrade, L Armus, WD Cotton, C DeCoursey, M Dickinson, TJW Lazio, E Momjian, K Penner, I Smail, OM Smirnov