LOFAR MSSS: detection of a low-frequency radio transient in 400 h of monitoring of the North Celestial Pole

Monthly Notices of the Royal Astronomical Society Oxford University Press 456:3 (2016) 2321-2342

Authors:

AJ Stewart, Robert Fender, JW Broderick, TE Hassall, T Muñoz-Darias, A Rowlinson, JD Swinbank, TD Staley, GJ Molenaar, B Scheers, TL Grobler, M Pietka, G Heald, JP McKean, ME Bell, A Bonafede, RP Breton, D Carbone, Y Cendes, AO Clarke, S Corbel, F de Gasperin, J Eislöffel, H Falcke, C Ferrari, J-M Grießmeier, MJ Hardcastle, V Heesen, JWT Hessels, A Horneffer, M Iacobelli, P Jonker, Aris Karastergiou, G Kokotanekov, VI Kondratiev, M Kuniyoshi, CJ Law, J van Leeuwen, S Markoff, JCA Miller-Jones, D Mulcahy, E Orru, M Pandey-Pommier, L Pratley, E Rol, HJA Röttgering, AMM Scaife, A Shulevski, CA Sobey, BW Stappers

Abstract:

We present the results of a four-month campaign searching for low-frequency radio transients near the North Celestial Pole with the Low-Frequency Array (LOFAR), as part of the Multifrequency Snapshot Sky Survey (MSSS). The data were recorded between 2011 December and 2012 April and comprised 2149 11-min snapshots, each covering 175 deg 2 . We have found one convincing candidate astrophysical transient, with a duration of a few minutes and a flux density at 60 MHz of 15-25 Jy. The transient does not repeat and has no obvious optical or high-energy counterpart, as a result of which its nature is unclear. The detection of this event implies a transient rate at 60 MHz of 3.9 -3.7 +14.7 × 10 -4 d -1 deg -2 , and a transient surface density of 1.5 × 10 -5 deg -2 , at a 7.9-Jy limiting flux density and ~10-min time-scale. The campaign data were also searched for transients at a range of other time-scales, from 0.5 to 297 min, which allowed us to place a range of limits on transient rates at 60MHz as a function of observation duration.

Localization and broadband follow-up of the gravitational-wave transient GW150914

(2016)

Authors:

BP Abbott, R Abbott, TD Abbott, MR Abernathy, F Acernese, K Ackley, C Adams, T Adams, P Addesso, RX Adhikari, VB Adya, C Affeldt, M Agathos, K Agatsuma, N Aggarwal, OD Aguiar, L Aiello, A Ain, P Ajith, B Allen, A Allocca, PA Altin, SB Anderson, WG Anderson, K Arai, MC Araya, CC Arceneaux, JS Areeda, N Arnaud, KG Arun, S Ascenzi, G Ashton, M Ast, SM Aston, P Astone, P Aufmuth, C Aulbert, S Babak, P Bacon, MKM Bader, PT Baker, F Baldaccini, G Ballardin, SW Ballmer, JC Barayoga, SE Barclay, BC Barish, D Barker, F Barone, B Barr, L Barsotti, M Barsuglia, D Barta, S Barthelmy, J Bartlett, I Bartos, R Bassiri, A Basti, JC Batch, C Baune, V Bavigadda, M Bazzan, B Behnke, M Bejger, AS Bell, CJ Bell, BK Berger, J Bergman, G Bergmann, CPL Berry, D Bersanetti, A Bertolini, J Betzwieser, S Bhagwat, R Bhandare, IA Bilenko, G Billingsley, J Birch, R Birney, S Biscans, A Bisht, M Bitossi, C Biwer, MA Bizouard, JK Blackburn, CD Blair, DG Blair, RM Blair, S Bloemen, O Bock, TP Bodiya, M Boer, G Bogaert, C Bogan, A Bohe, P Bojtos, C Bond, F Bondu, R Bonnand, BA Boom, R Bork, V Boschi, S Bose, Y Bouffanais, A Bozzi, C Bradaschia, PR Brady, VB Braginsky, M Branchesi, JE Brau, T Briant, A Brillet, M Brinkmann, V Brisson, P Brockill, AF Brooks, DA Brown, DD Brown, NM Brown, CC Buchanan, A Buikema, T Bulik, HJ Bulten, A Buonanno, D Buskulic, C Buy, RL Byer, L Cadonati, G Cagnoli, C Cahillane, JC Bustillo, T Callister, E Calloni, JB Camp, KC Cannon, J Cao, CD Capano, E Capocasa, F Carbognani, S Caride, JC Diaz, C Casentini, S Caudill, M Cavaglià, F Cavalier, R Cavalieri, G Cella, CB Cepeda, LC Baiardi, G Cerretani, E Cesarini, R Chakraborty, T Chalermsongsak, SJ Chamberlin, M Chan, S Chao, P Charlton, E Chassande-Mottin, HY Chen, Y Chen, C Cheng, A Chincarini, A Chiummo, HS Cho, M Cho, JH Chow, N Christensen, Q Chu, S Chua, S Chung, G Ciani, F Clara, JA Clark, F Cleva, E Coccia, P-F Cohadon, A Colla, CG Collette, L Cominsky, M Constancio, A Conte, L Conti, D Cook, TR Corbitt, N Cornish, A Corsi, S Cortese, CA Costa, MW Coughlin, SB Coughlin, J-P Coulon, ST Countryman, P Couvares, EE Cowan, DM Coward, MJ Cowart, DC Coyne, R Coyne, K Craig, JDE Creighton, J Cripe, SG Crowder, A Cumming, L Cunningham, E Cuoco, T Dal Canton, SL Danilishin, S D'Antonio, K Danzmann, NS Darman, V Dattilo, I Dave, HP Daveloza, M Davier, GS Davies, EJ Daw, R Day, D DeBra, G Debreczeni, J Degallaix, M De Laurentis, S Deléglise, W Del Pozzo, T Denker, T Dent, H Dereli, V Dergachev, RT DeRosa, R De Rosa, R DeSalvo, S Dhurandhar, MC Díaz, L Di Fiore, M Di Giovanni, A Di Lieto, S Di Pace, I Di Palma, A Di Virgilio, G Dojcinoski, V Dolique, F Donovan, KL Dooley, S Doravari, R Douglas, TP Downes, M Drago, RWP Drever, JC Driggers, Z Du, M Ducrot, SE Dwyer, TB Edo, MC Edwards, A Effler, H-B Eggenstein, P Ehrens, J Eichholz, SS Eikenberry, W Engels, RC Essick, T Etzel, M Evans, TM Evans, R Everett, M Factourovich, V Fafone, H Fair, S Fairhurst, X Fan, Q Fang, S Farinon, B Farr, WM Farr, M Favata, M Fays, H Fehrmann, MM Fejer, I Ferrante, EC Ferreira, F Ferrini, F Fidecaro, I Fiori, D Fiorucci, RP Fisher, R Flaminio, M Fletcher, J-D Fournier, S Franco, S Frasca, F Frasconi, Z Frei, A Freise, R Frey, V Frey, TT Fricke, P Fritschel, VV Frolov, P Fulda, M Fyffe, HAG Gabbard, JR Gair, L Gammaitoni, SG Gaonkar, F Garufi, A Gatto, G Gaur, N Gehrels, G Gemme, B Gendre, E Genin, A Gennai, J George, L Gergely, V Germain, A Ghosh, S Ghosh, JA Giaime, KD Giardina, A Giazotto, K Gill, A Glaefke, E Goetz, R Goetz, L Gondan, G González, JMG Castro, A Gopakumar, NA Gordon, ML Gorodetsky, SE Gossan, M Gosselin, R Gouaty, C Graef, PB Graff, M Granata, A Grant, S Gras, C Gray, G Greco, AC Green, P Groot, H Grote, S Grunewald, GM Guidi, X Guo, A Gupta, MK Gupta, KE Gushwa, EK Gustafson, R Gustafson, JJ Hacker, BR Hall, ED Hall, G Hammond, M Haney, MM Hanke, J Hanks, C Hanna, MD Hannam, J Hanson, T Hardwick, K Haris, J Harms, GM Harry, IW Harry, MJ Hart, MT Hartman, C-J Haster, K Haughian, A Heidmann, MC Heintze, H Heitmann, P Hello, G Hemming, M Hendry, IS Heng, J Hennig, AW Heptonstall, M Heurs, S Hild, D Hoak, KA Hodge, D Hofman, SE Hollitt, K Holt, DE Holz, P Hopkins, DJ Hosken, J Hough, EA Houston, EJ Howell, YM Hu, S Huang, EA Huerta, D Huet, B Hughey, S Husa, SH Huttner, T Huynh-Dinh, A Idrisy, N Indik, DR Ingram, R Inta, HN Isa, J-M Isac, M Isi, G Islas, T Isogai, BR Iyer, K Izumi, T Jacqmin, H Jang, K Jani, P Jaranowski, S Jawahar, F Jiménez-Forteza, WW Johnson, DI Jones, R Jones, RJG Jonker, L Ju, CV Kalaghatgi, V Kalogera, S Kandhasamy, G Kang, JB Kanner, S Karki, M Kasprzack, E Katsavounidis, W Katzman, S Kaufer, T Kaur, K Kawabe, F Kawazoe, F Kéfélian, MS Kehl, D Keitel, DB Kelley, W Kells, R Kennedy, JS Key, A Khalaidovski, FY Khalili, I Khan, S Khan, Z Khan, EA Khazanov, N Kijbunchoo, C Kim, J Kim, K Kim, N Kim, N Kim, Y-M Kim, EJ King, PJ King, DL Kinzel, JS Kissel, L Kleybolte, S Klimenko, SM Koehlenbeck, K Kokeyama, S Koley, V Kondrashov, A Kontos, M 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Milvang-Jensen, D Watson, M Irwin, CG Fernandez, RG McMahon, M Banerji, E Gonzalez-Solares, S Schulze, A de U Postigo, CC Thoene, Z Cano, S Rosswog

Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: The case study 4C74.26

Argentinian Astronomical Society (2016)

Authors:

Arabella T Araudo, Anthony R Bell, Katherine M Blundell

Abstract:

It has been suggested that relativistic shocks in extragalactic sources may accelerate the most energetic cosmic rays. However, recent theoretical advances indicating that relativistic shocks are probably unable to accelerate particles to energies much larger than a PeV cast doubt on this. In the present contribution we model the radio to X-ray emission in the southern hotspot of the quasar 4C74.26. The synchrotron radio emission is resolved near the shock with the MERLIN radio-interferometer, and the rapid decay of this emission behind the shock is interpreted as the decay of the downstream magnetic field as expected for small scale turbulence. If our result is confirmed by analyses of other radiogalaxies, it provides firm observational evidence that relativistic shocks at the termination region of powerful jets in FR II radiogalaxies do not accelerate ultra high energy cosmic rays.

Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: The case study 4C74.26

(2016)

Authors:

Anabella T Araudo, Anthony R Bell, Katherine M Blundell

Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 456:2 (2016) 1791-1802

Authors:

B Marcote, M Ribó, JM Paredes, CH Ishwara-Chandra, JD Swinbank, JW Broderick, S Markoff, R Fender, RAMJ Wijers, GG Pooley, AJ Stewart, ME Bell, RP Breton, D Carbone, S Corbel, J Eislöffel, H Falcke, J-M Grie smeier, M Kuniyoshi, M Pietka, A Rowlinson, M Serylak, AJ van der Horst, J van Leeuwen, MW Wise, P Zarka