Constraining particle acceleration in Sgr Awith simultaneous GRAVITY,Spitzer,NuSTAR, andChandraobservations

Astronomy & Astrophysics EDP Sciences 654 (2021) A22-A22

Authors:

R Abuter, A Amorim, M Bauböck, F Baganoff, JP Berger, H Boyce, H Bonnet, W Brandner, Y Clénet, R Davies, PT de Zeeuw, J Dexter, Y Dallilar, A Drescher, A Eckart, F Eisenhauer, GG Fazio, NM Förster Schreiber, K Foster, C Gammie, P Garcia, F Gao, E Gendron, R Genzel, G Ghisellini

Abstract:

We report the time-resolved spectral analysis of a bright near-infrared and moderate X-ray flare of Sgr A ⋆ . We obtained light curves in the M , K , and H bands in the mid- and near-infrared and in the 2 − 8 keV and 2 − 70 keV bands in the X-ray. The observed spectral slope in the near-infrared band is νL ν ∝ ν 0.5 ± 0.2 ; the spectral slope observed in the X-ray band is νL ν ∝ ν −0.7 ± 0.5 . Using a fast numerical implementation of a synchrotron sphere with a constant radius, magnetic field, and electron density (i.e., a one-zone model), we tested various synchrotron and synchrotron self-Compton scenarios. The observed near-infrared brightness and X-ray faintness, together with the observed spectral slopes, pose challenges for all models explored. We rule out a scenario in which the near-infrared emission is synchrotron emission and the X-ray emission is synchrotron self-Compton. Two realizations of the one-zone model can explain the observed flare and its temporal correlation: one-zone model in which the near-infrared and X-ray luminosity are produced by synchrotron self-Compton and a model in which the luminosity stems from a cooled synchrotron spectrum. Both models can describe the mean spectral energy distribution (SED) and temporal evolution similarly well. In order to describe the mean SED, both models require specific values of the maximum Lorentz factor γ max , which differ by roughly two orders of magnitude. The synchrotron self-Compton model suggests that electrons are accelerated to γ max ∼ 500, while cooled synchrotron model requires acceleration up to γ max ∼ 5 × 10 4 . The synchrotron self-Compton scenario requires electron densities of 10 10 cm −3 that are much larger than typical ambient densities in the accretion flow. Furthermore, it requires a variation of the particle density that is inconsistent with the average mass-flow rate inferred from polarization measurements and can therefore only be realized in an extraordinary accretion event. In contrast, assuming a source size of 1 R S , the cooled synchrotron scenario can be realized with densities and magnetic fields comparable with the ambient accretion flow. For both models, the temporal evolution is regulated through the maximum acceleration factor γ max , implying that sustained particle acceleration is required to explain at least a part of the temporal evolution of the flare.

Searching for solar KDAR with DUNE

(2021)

Authors:

DUNE Collaboration, A Abed Abud, B Abi, R Acciarri, MA Acero, MR Adames, G Adamov, D Adams, M Adinolfi, A Aduszkiewicz, J Aguilar, Z Ahmad, J Ahmed, B Ali-Mohammadzadeh, T Alion, K Allison, S Alonso Monsalve, M Alrashed, C Alt, A Alton, P Amedo, J Anderson, C Andreopoulos, M Andreotti, MP Andrews, F Andrianala, S Andringa, N Anfimov, A Ankowski, M Antoniassi, M Antonova, A Antoshkin, S Antusch, A Aranda-Fernandez, A Ariga, LO Arnold, MA Arroyave, J Asaadi, L Asquith, A Aurisano, V Aushev, D Autiero, M Ayala-Torres, F Azfar, A Back, H Back, JJ Back, C Backhouse, P Baesso, I Bagaturia, L Bagby, N Balashov, S Balasubramanian, P Baldi, B Baller, B Bambah, F Barao, G Barenboim, GJ Barker, W Barkhouse, C Barnes, G Barr, J Barranco Monarca, A Barros, N Barros, JL Barrow, A Basharina-Freshville, A Bashyal, V Basque, E Belchior, JBR Battat, F Battisti, F Bay, JL Bazo Alba, JF Beacom, E Bechetoille, B Behera, L Bellantoni, G Bellettini, V Bellini, O Beltramello, D Belver, N Benekos, C Benitez Montiel, F Bento Neves, J Berger, S Berkman, P Bernardini, RM Berner, H Berns, S Bertolucci, M Betancourt, A Betancur Rodríguez, A Bevan, TJC Bezerra, V Bhatnagar, M Bhattacharjee, S Bhuller, B Bhuyan, S Biagi, J Bian, M Biassoni, K Biery, B Bilki, M Bishai, A Bitadze, A Blake, FDM Blaszczyk, GC Blazey, E Blucher, J Boissevain, S Bolognesi, T Bolton, L Bomben, M Bonesini, M Bongrand, F Bonini, A Booth, C Booth, F Boran, S Bordoni, A Borkum, T Boschi, N Bostan, P Bour, C Bourgeois, SB Boyd, D Boyden, J Bracinik, D Braga, D Brailsford, A Branca, A Brandt, J Bremer, C Brew, E Brianne, SJ Brice, C Brizzolari, C Bromberg, G Brooijmans, J Brooke, A Bross, G Brunetti, M Brunetti, N Buchanan, H Budd, I Butorov, I Cagnoli, D Caiulo, R Calabrese, P Calafiura, J Calcutt, M Calin, S Calvez, E Calvo, A Caminata, M Campanelli, K Cankocak, D Caratelli, G Carini, B Carlus, MF Carneiro, P Carniti, I Caro Terrazas, H Carranza, T Carroll, JF Castaño Forero, A Castillo, C Castromonte, E Catano-Mur, C Cattadori, F Cavalier, F Cavanna, S Centro, G Cerati, A Cervelli, A Cervera Villanueva, M Chalifour, A Chappell, E Chardonnet, N Charitonidis, A Chatterjee, S Chattopadhyay, H Chen, M Chen, Y Chen, Z Chen, Y Cheon, D Cherdack, C Chi, S Childress, A Chiriacescu, G Chisnall, K Cho, S Choate, D Chokheli, PS Chong, S Choubey, A Christensen, D Christian, G Christodoulou, A Chukanov, M Chung, E Church, V Cicero, P Clarke, TE Coan, AG Cocco, JAB Coelho, E Conley, R Conley, JM Conrad, M Convery, S Copello, L Corwin, R Valentim, L Cremaldi, L Cremonesi, JI Crespo-Anadón, M Crisler, E Cristaldo, R Cross, A Cudd, C Cuesta, Y Cui, D Cussans, O Dalager, H da Motta, L Da Silva Peres, C David, Q David, GS Davies, S Davini, J Dawson, K De, P Debbins, I De Bonis, MP Decowski, A de Gouvêa, PC De Holanda, IL De Icaza Astiz, A Deisting, P De Jong, A Delbart, D Delepine, M Delgado, A Dell'Acqua, P De Lurgio, JRT de Mello Neto, DM DeMuth, S Dennis, C Densham, GW Deptuch, A De Roeck, V De Romeri, G De Souza, R Devi, R Dharmapalan, M Dias, F Diaz, JS Díaz, S Di Domizio, L Di Giulio, P Ding, L Di Noto, C Distefano, R Diurba, M Diwan, Z Djurcic, D Doering, S Dolan, F Dolek, MJ Dolinski, L Domine, D Douglas, D Douillet, G Drake, F Drielsma, L Duarte, D Duchesneau, K Duffy, P Dunne, T Durkin, H Duyang, O Dvornikov, DA Dwyer, AS Dyshkant, M Eads, A Earle, D Edmunds, J Eisch, L Emberger, S Emery, A Ereditato, T Erjavec, CO Escobar, G Eurin, JJ Evans, E Ewart, AC Ezeribe, K Fahey, A Falcone, M Fani, C Farnese, Y Farzan, D Fedoseev, J Felix, Y Feng, E Fernandez-Martinez, P Fernandez Menendez, M Fernandez Morales, F Ferraro, L Fields, P Filip, F Filthaut, A Fiorentini, M Fiorini, RS Fitzpatrick, W Flanagan, B Fleming, R Flight, DV Forero, J Fowler, W Fox, J Franc, K Francis, D Franco, J Freeman, J Freestone, J Fried, A Friedland, F Fuentes Robayo, S Fuess, IK Furic, AP Furmanski, A Gabrielli, A Gago, H Gallagher, A Gallas, A Gallego-Ros, N Gallice, V Galymov, E Gamberini, T Gamble, F Ganacim, R Gandhi, R Gandrajula, F Gao, S Gao, AC Garcia B., D Garcia-Gamez, MÁ García-Peris, S Gardiner, D Gastler, J Gauvreau, G Ge, B Gelli, A Gendotti, S Gent, Z Ghorbani-Moghaddam, P Giammaria, T Giammaria, D Gibin, I Gil-Botella, S Gilligan, C Girerd, AK Giri, D Gnani, O Gogota, M Gold, S Gollapinni, K Gollwitzer, RA Gomes, LV Gomez Bermeo, LS Gomez Fajardo, F Gonnella, JA Gonzalez-Cuevas, D Gonzalez Diaz, M Gonzalez-Lopez, MC Goodman, O Goodwin, S Goswami, C Gotti, E Goudzovski, C Grace, M Graham, R Gran, E Granados, P Granger, A Grant, C Grant, D Gratieri, P Green, L Greenler, J Greer, J Grenard, WC Griffith, M Groh, J Grudzinski, K Grzelak, W Gu, E Guardincerri, V Guarino, M Guarise, R Guenette, E Guerard, M Guerzoni, A Guglielmi, B Guo, KK Guthikonda, R Gutierrez, P Guzowski, MM Guzzo, S Gwon, C Ha, A Habig, H Hadavand, R Haenni, A Hahn, J Haiston, P Hamacher-Baumann, T Hamernik, P Hamilton, J Han, DA Harris, J Hartnell, J Harton, T Hasegawa, C Hasnip, R Hatcher, KW Hatfield, A Hatzikoutelis, C Hayes, K Hayrapetyan, J Hays, E Hazen, M He, A Heavey, KM Heeger, J Heise, K Hennessy, S Henry, MA Hernandez Morquecho, K Herner, L Hertel, V Hewes, A Higuera, T Hill, SJ Hillier, A Himmel, LR Hirsch, J Ho, J Hoff, A Holin, E Hoppe, GA Horton-Smith, M Hostert, A Hourlier, B Howard, R Howell, I Hristova, MS Hronek, J Huang, J Huang, J Hugon, G Iles, N Ilic, AM Iliescu, R Illingworth, G Ingratta, A Ioannisian, L Isenhower, R Itay, A Izmaylov, CM Jackson, V Jain, E James, W Jang, B Jargowsky, F Jediny, D Jena, YS Jeong, C Jesús-Valls, X Ji, L Jiang, S Jiménez, A Jipa, R Johnson, N Johnston, B Jones, SB Jones, M Judah, CK Jung, T Junk, Y Jwa, M Kabirnezhad, A Kaboth, I Kadenko, I Kakorin, A Kalitkina, F., D Kalra, Kamiya, N Kaneshige, G Karagiorgi, G Karaman, A Karcher, M Karolak, Y Karyotakis, S Kasai, SP Kasetti, L Kashur, N Kazaryan, E Kearns, P Keener, KJ Kelly, E Kemp, O Kemularia, W Ketchum, SH Kettell, M Khabibullin, A Khotjantsev, A Khvedelidze, D Kim, B King, B Kirby, M Kirby, J Klein, K Koehler, LW Koerner, S Kohn, PP Koller, L Kolupaeva, D Korablev, M Kordosky, T Kosc, U Kose, VA Kostelecký, K Kothekar, F Krennrich, I Kreslo, W Kropp, Y Kudenko, VA Kudryavtsev, S Kulagin, J Kumar, P Kumar, P Kunze, C Kuruppu, V Kus, T Kutter, J Kvasnicka, D Kwak, A Lambert, BJ Land, K Lande, CE Lane, K Lang, T Langford, M Langstaff, J Larkin, P Lasorak, D Last, C Lastoria, A Laundrie, G Laurenti, A Lawrence, I Lazanu, R LaZur, M Lazzaroni, T Le, S Leardini, J Learned, P LeBrun, T LeCompte, C Lee, SY Lee, G Lehmann Miotto, R Lehnert, MA Leigui de Oliveira, M Leitner, LM Lepin, L Li, SW Li, T Li, Y Li, H Liao, CS Lin, Q Lin, S Lin, J Ling, A Lister, BR Littlejohn, J Liu, S Lockwitz, T Loew, M Lokajicek, I Lomidze, K Long, K Loo, T Lord, JM LoSecco, WC Louis, X-G Lu, KB Luk, X Luo, E Luppi, N Lurkin, T Lux, VP Luzio, D MacFarlane, AA Machado, P Machado, CT Macias, JR Macier, A Maddalena, A Madera, P Madigan, S Magill, K Mahn, A Maio, A Major, JA Maloney, G Mandrioli, RC Mandujano, J Maneira, L Manenti, S Manly, A Mann, K Manolopoulos, M Manrique Plata, VN Manyam, L Manzanillas, M Marchan, A Marchionni, W Marciano, D Marfatia, C Mariani, J Maricic, R Marie, F Marinho, AD Marino, D Marsden, M Marshak, CM Marshall, J Marshall, J Marteau, J Martin-Albo, N Martinez, DA Martinez Caicedo, S Martynenko, V Mascagna, K Mason, A Mastbaum, M Masud, F Matichard, S Matsuno, J Matthews, C Mauger, N Mauri, K Mavrokoridis, I Mawby, R Mazza, A Mazzacane, E Mazzucato, T McAskill, E McCluskey, N McConkey, KS McFarland, C McGrew, A McNab, A Mefodiev, P Mehta, P Melas, O Mena, S Menary, H Mendez, P Mendez, DP Méndez, A Menegolli, G Meng, MD Messier, W Metcalf, T Mettler, M Mewes, H Meyer, T Miao, G Michna, T Miedema, V Mikola, R Milincic, G Miller, W Miller, J Mills, C Milne, O Mineev, OG Miranda, S Miryala, CS Mishra, SR Mishra, A Mislivec, D Mladenov, I Mocioiu, K Moffat, N Moggi, R Mohanta, TA Mohayai, N Mokhov, J Molina, L Molina Bueno, E Montagna, A Montanari, C Montanari, D Montanari, LM Montano Zetina, J Moon, SH Moon, M Mooney, AF Moor, D Moreno, C Morris, C Mossey, E Motuk, CA Moura, J Mousseau, G Mouster, W Mu, L Mualem, J Mueller, M Muether, S Mufson, F Muheim, A Muir, M Mulhearn, D Munford, H Muramatsu, S Murphy, J Musser, J Nachtman, S Nagu, M Nalbandyan, R Nandakumar, D Naples, S Narita, A Nath, D Navas-Nicolás, A Navrer-Agasson, N Nayak, M Nebot-Guinot, K Negishi, JK Nelson, J Nesbit, M Nessi, D Newbold, M Newcomer, D Newhart, H Newton, R Nichol, F Nicolas-Arnaldos, E Niner, K Nishimura, A Norman, A Norrick, R Northrop, P Novella, JA Nowak, M Oberling, JP Ochoa-Ricoux, A Olivares Del Campo, A Olivier, A Olshevskiy, Y Onel, Y Onishchuk, J Ott, L Pagani, S Pakvasa, G Palacio, O Palamara, S Palestini, JM Paley, M Pallavicini, C Palomares, JL Palomino-Gallo, W Panduro Vazquez, E Pantic, V Paolone, V Papadimitriou, R Papaleo, A Papanestis, S Paramesvaran, S Parke, E Parozzi, Z Parsa, M Parvu, S Pascoli, L Pasqualini, J Pasternak, J Pater, C Patrick, L Patrizii, RB Patterson, SJ Patton, T Patzak, A Paudel, B Paulos, L Paulucci, Z Pavlovic, G Pawloski, D Payne, V Pec, SJM Peeters, E Pennacchio, A Penzo, OLG Peres, J Perry, D Pershey, G Pessina, G Petrillo, C Petta, R Petti, V Pia, F Piastra, L Pickering, F Pietropaolo, R Plunkett, R Poling, X Pons, N Poonthottathil, F Poppi, S Pordes, J Porter, M Potekhin, R Potenza, BVKS Potukuchi, J Pozimski, M Pozzato, S Prakash, T Prakash, M Prest, S Prince, F Psihas, D Pugnere, X Qian, MC Queiroga Bazetto, JL Raaf, V Radeka, J Rademacker, B Radics, A Rafique, E Raguzin, M Rai, M Rajaoalisoa, I Rakhno, A Rakotonandrasana, L Rakotondravohitra, YA Ramachers, R Rameika, MA Ramirez Delgado, B Ramson, A Rappoldi, G Raselli, P Ratoff, S Raut, RF Razakamiandra, E Rea, JS Real, B Rebel, M Reggiani-Guzzo, T Rehak, J Reichenbacher, SD Reitzner, H Rejeb Sfar, A Renshaw, S Rescia, F Resnati, A Reynolds, M Ribas, S Riboldi, C Riccio, G Riccobene, LCJ Rice, J Ricol, A Rigamonti, Y Rigaut, D Rivera, A Robert, L Rochester, M Roda, P Rodrigues, MJ Rodriguez Alonso, E Rodriguez Bonilla, J Rodriguez Rondon, S Rosauro-Alcaraz, M Rosenberg, P Rosier, B Roskovec, M Rossella, M Rossi, C Rott, J Rout, P Roy, S Roy, A Rubbia, C Rubbia, FC Rubio, B Russell, D Ruterbories, A Rybnikov, A Saa-Hernandez, R Saakyan, S Sacerdoti, T Safford, N Sahu, P Sala, N Samios, O Samoylov, MC Sanchez, V Sandberg, DA Sanders, D Sankey, S Santana, M Santos-Maldonado, N Saoulidou, P Sapienza, C Sarasty, I Sarcevic, G Savage, V Savinov, A Scaramelli, A Scarff, A Scarpelli, T Schaffer, H Schellman, S Schifano, P Schlabach, D Schmitz, K Scholberg, A Schukraft, E Segreto, A Selyunin, CR Senise, J Sensenig, M Seoane, I Seong, A Sergi, D Sgalaberna, MH Shaevitz, S Shafaq, M Shamma, R Sharankova, HR Sharma, R Sharma, R Kumar, T Shaw, C Shepherd-Themistocleous, A Sheshukov, S Shin, I Shoemaker, D Shooltz, R Shrock, H Siegel, L Simard, F Simon, J Sinclair, G Sinev, J Singh, J Singh, L Singh, V Singh, R Sipos, FW Sippach, G Sirri, A Sitraka, K Siyeon, K Skarpaas, A Smith, E Smith, P Smith, J Smolik, M Smy, EL Snider, P Snopok, D Snowden-Ifft, M Soares Nunes, H Sobel, M Soderberg, S Sokolov, CJ Solano Salinas, S Söldner-Rembold, SR Soleti, N Solomey, V Solovov, WE Sondheim, M Sorel, A Sotnikov, J Soto-Oton, A Sousa, K Soustruznik, F Spagliardi, M Spanu, J Spitz, NJC Spooner, K Spurgeon, R Staley, M Stancari, L Stanco, R Stanley, R Stein, HM Steiner, AF Steklain Lisbôa, J Stewart, B Stillwell, J Stock, F Stocker, T Stokes, M Strait, T Strauss, S Striganov, A Stuart, JG Suarez, H Sullivan, D Summers, A Surdo, V Susic, L Suter, CM Sutera, R Svoboda, B Szczerbinska, AM Szelc, HA Tanaka, B Tapia Oregui, A Tapper, S Tariq, E Tatar, R Tayloe, AM Teklu, M Tenti, K Terao, CA Ternes, F Terranova, G Testera, T Thakore, A Thea, JL Thompson, C Thorn, SC Timm, V Tishchenko, J Todd, L Tomassetti, A Tonazzo, D Torbunov, M Torti, M Tortola, F Tortorici, N Tosi, D Totani, M Toups, C Touramanis, R Travaglini, J Trevor, S Trilov, A Tripathi, WH Trzaska, Y Tsai, Y-T Tsai, Z Tsamalaidze, KV Tsang, N Tsverava, S Tufanli, C Tull, E Tyley, M Tzanov, L Uboldi, MA Uchida, J Urheim, T Usher, S Uzunyan, MR Vagins, P Vahle, GA Valdiviesso, E Valencia, Z Vallari, E Vallazza, JWF Valle, S Vallecorsa, R Van Berg, RG Van de Water, F Varanini, D Vargas, G Varner, J Vasel, S Vasina, G Vasseur, N Vaughan, K Vaziri, S Ventura, A Verdugo, S Vergani, MA Vermeulen, M Verzocchi, M Vicenzi, H Vieira de Souza, C Vignoli, C Vilela, B Viren, T Vrba, T Wachala, AV Waldron, M Wallbank, C Wallis, H Wang, J Wang, L Wang, MHLS Wang, Y Wang, Y Wang, K Warburton, D Warner, MO Wascko, D Waters, A Watson, P Weatherly, A Weber, M Weber, H Wei, A Weinstein, D Wenman, M Wetstein, A White, LH Whitehead, D Whittington, MJ Wilking, C Wilkinson, Z Williams, F Wilson, RJ Wilson, W Wisniewski, J Wolcott, T Wongjirad, A Wood, K Wood, E Worcester, M Worcester, C Wret, W Wu, W Wu, Y Xiao, F Xie, E Yandel, G Yang, K Yang, S Yang, T Yang, A Yankelevich, N Yershov, K Yonehara, T Young, B Yu, H Yu, H Yu, J Yu, W Yuan, R Zaki, J Zalesak, L Zambelli, B Zamorano, A Zani, L Zazueta, GP Zeller, J Zennamo, K Zeug, C Zhang, M Zhao, E Zhivun, G Zhu, P Zilberman, ED Zimmerman, M Zito, S Zucchelli, J Zuklin, V Zutshi, R Zwaska

The lens SW05 J143454.4+522850: a fossil group at redshift 0.6?

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 506:2 (2021) 1715-1722

Authors:

Philipp Denzel, Onur Çatmabacak, Jonathan Coles, Claude Cornen, Robert Feldmann, Ignacio Ferreras, Xanthe Gwyn Palmer, Rafael Küng, Dominik Leier, Prasenjit Saha, Aprajita Verma

Vector-apodizing phase plate coronagraph: design, current performance, and future development [Invited].

Applied Optics Optica Publishing Group 60:19 (2021) d52-d72

Authors:

DS Doelman, F Snik, EH Por, SP Bos, GPPL Otten, M Kenworthy, SY Haffert, M Wilby, AJ Bohn, BJ Sutlieff, K Miller, M Ouellet, J de Boer, CU Keller, MJ Escuti, S Shi, NZ Warriner, K Hornburg, JL Birkby, J Males, KM Morzinski, LM Close, J Codona, J Long, L Schatz, J Lumbres, A Rodack, K Van Gorkom, A Hedglen, O Guyon, J Lozi, T Groff, J Chilcote, N Jovanovic, S Thibault, C de Jonge, G Allain, C Vallée, D Patel, O Côté, C Marois, P Hinz, J Stone, A Skemer, Z Briesemeister, A Boehle, AM Glauser, W Taylor, P Baudoz, E Huby, O Absil, B Carlomagno, C Delacroix

High-contrast observations of brown dwarf companion HR 2562 B with the vector Apodizing Phase Plate coronagraph

(2021)

Authors:

Ben J Sutlieff, Alexander J Bohn, Jayne L Birkby, Matthew A Kenworthy, Katie M Morzinski, David S Doelman, Jared R Males, Frans Snik, Laird M Close, Philip M Hinz, David Charbonneau