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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Schultz, L Denneau, H Flewelling, EA Magnier, N Primak, A Rest, A Sherstyuk, B Stalder, CW Stubbs, J Tonry, C Waters, M Willman, F Olivares E., H Campbell, R Kotak, J Sollerman, M Smith, M Dennefeld, JP Anderson, MT Botticella, T-W Chen, MD Valle, N Elias-Rosa, M Fraser, C Inserra, E Kankare, T Kupfer, J Harmanen, L Galbany, L Le Guillou, JD Lyman, K Maguire, A Mitra, M Nicholl, A Razza, G Terreran, S Valenti, A Gal-Yam, A Ćwiek, M Ćwiok, L Mankiewicz, R Opiela, M Zaremba, AF Żarnecki, CA Onken, RA Scalzo, BP Schmidt, C Wolf, F Yuan, PA Evans, JA Kennea, DN Burrows, S Campana, SB Cenko, P Giommi, FE Marshall, J Nousek, P O'Brien, JP Osborne, D Palmer, M Perri, M Siegel, G Tagliaferri, A Klotz, D Turpin, R Laugier, M Beroiz, T Peñuela, LM Macri, RJ Oelkers, DG Lambas, R Vrech, J Cabral, C Colazo, M Dominguez, B Sanchez, S Gurovich, M Lares, JL Marshall, DL DePoy, N Padilla, NA Pereyra, M Benacquista, NR Tanvir, K Wiersema, AJ Levan, D Steeghs, J Hjorth, JPU Fynbo, D Malesani, B 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

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

LOFAR, VLA, AND CHANDRA OBSERVATIONS OF THE TOOTHBRUSH GALAXY CLUSTER

The Astrophysical Journal American Astronomical Society 818:2 (2016) 204

Authors:

RJ van Weeren, G Brunetti, M Brüggen, F Andrade-Santos, GA Ogrean, WL Williams, HJA Röttgering, WA Dawson, WR Forman, F de Gasperin, MJ Hardcastle, C Jones, GK Miley, DA Rafferty, L Rudnick, J Sabater, CL Sarazin, TW Shimwell, A Bonafede, PN Best, L Bîrzan, R Cassano, KT Chyży, JH Croston, TJ Dijkema, T Enßlin, C Ferrari, G Heald, M Hoeft, C Horellou, MJ Jarvis, RP Kraft, M Mevius, HT Intema, SS Murray, E Orrú, R Pizzo, SS Sridhar, A Simionescu, A Stroe, S van der Tol, GJ White

The KMOS Redshift One Spectroscopic Survey (KROSS): dynamical properties, gas and dark matter fractions of typical z ∼ 1 star-forming galaxies

Monthly Notices of the Royal Astronomical Society Oxford University Press 457:2 (2016) 1888-1904

Authors:

John Stott, AM Swinbank, HL Johnson, A Tiley, G Magdis, R Bower, AJ Bunker, Martin Bureau, CM Harrison, Matthew Jarvis, R Sharples, I Smail, D Sobral, P Best, M Cirasuolo

Abstract:

The KMOS Redshift One Spectroscopic Survey (KROSS) is an ESO-guaranteed time survey of 795 typical star-forming galaxies in the redshift range z = 0.8-1.0 with the KMOS instrument on the Very Large Telescope. In this paper, we present resolved kinematics and star formation rates for 584 z ~ 1 galaxies. This constitutes the largest near-infrared Integral Field Unit survey of galaxies at z ~ 1 to date. We demonstrate the success of our selection criteria with 90 per cent of our targets found to be Hα emitters, of which 81 per cent are spatially resolved. The fraction of the resolved KROSS sample with dynamics dominated by ordered rotation is found to be 83 ± 5 per cent. However, when compared with local samples these are turbulent discs with high gas to baryonic mass fractions, ~35 per cent, and the majority are consistent with being marginally unstable (Toomre Q~1). There is no strong correlation between galaxy averaged velocity dispersion and the total star formation rate, suggesting that feedback from star formation is not the origin of the elevated turbulence. We postulate that it is the ubiquity of high (likely molecular) gas fractions and the associated gravitational instabilities that drive the elevated star formation rates in these typical z ~ 1 galaxies, leading to the 10-fold enhanced star formation rate density. Finally, by comparing the gas masses obtained from inverting the star formation law with the dynamical and stellar masses, we infer an average dark matter to total mass fraction within 2.2re (9.5 kpc) of 65 ± 12 per cent, in agreement with the results from hydrodynamic simulations of galaxy formation.