Pulsars, transients and relativistic astrophysics

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Stratified disc wind models for the AGN broad-line region: ultraviolet, optical and X-ray properties

ArXiv 2001.03625 (2020)

Authors:

James H Matthews, Christian Knigge, Nick Higginbottom, Knox S Long, Stuart A Sim, Samuel W Mangham, Edward J Parkinson, Henrietta A Hewitt
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FPGA architecture to search for accelerated pulsars with SKA

Institute of Electrical and Electronics Engineers (IEEE) 00 (2020) 1-5

Authors:

P Thiagaraj, B Stappers, A Ghalame, L Levin, A Karastergiou, J Roy, M Mickaliger, M Keith
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MKT J170456.2-482100: the first transient discovered by MeerKAT

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 491:1 (2020) 560-575

Authors:

Ln Driessen, I McDonald, Dah Buckley, M Caleb, Ej Kotze, Sb Potter, Km Rajwade, A Rowlinson, Bw Stappers, E Tremou, Pa Woudt, Rp Fender, R Armstrong, P Groot, I Heywood, A Horesh, Aj van der Horst, E Koerding, Va McBride, Jca Miller-Jones, Kp Mooley, Ramj Wijers

Abstract:

© 2019 The Author(s) We report the discovery of the first transient with MeerKAT, MKT J170456.2−482100, discovered in ThunderKAT images of the low-mass X-ray binary GX339−4. MKT J170456.2−482100 is variable in the radio, reaching a maximum flux density of 0.71 ± 0.11 mJy on 2019 October 12, and is undetected in 15 out of 48 ThunderKAT epochs. MKT J170456.2−482100 is coincident with the chromospherically active K-type sub-giant TYC 8332-2529-1, and ∼ 18 yr of archival optical photometry of the star shows that it varies with a period of 21.25 ± 0.04 d. The shape and phase of the optical light curve changes over time, and we detect both X-ray and UV emission at the position of MKT J170456.2−482100, which may indicate that TYC 8332-2529-1 has large star spots. Spectroscopic analysis shows that TYC 8332-2529-1 is in a binary, and has a line-of-sight radial velocity amplitude of 43 km s−1. We also observe a spectral feature in antiphase with the K-type sub-giant, with a line-of-sight radial velocity amplitude of ∼ 12 ± 10 km s−1, whose origins cannot currently be explained. Further observations and investigation are required to determine the nature of the MKT J170456.2−482100 system.
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Probing the non-thermal emission in the Perseus cluster with the JVLA

Proceedings of the International Astronomical Union (2020) 44-52

Authors:

M Gendron-Marsolais, J Hlavacek-Larrondo, RJ Van Weeren, T Clarke, AC Fabian, HT Intema, GB Taylor, KM Blundell, JS Sanders

Abstract:

© International Astronomical Union 2020. We present deep low radio frequency (230-470 MHz) observations from the Karl G. Jansky Very Large Array of the Perseus cluster, probing the non-thermal emission from the old particle population of the AGN outflows. Our observations of this nearby relaxed cool core cluster have revealed a multitude of new structures associated with the mini-halo, extending to hundreds of kpc in size. Its irregular morphology seems to have been influenced both by the AGN activity and by the sloshing motion of the cluster' gas. In addition, it has a filamentary structure similar to that seen in radio relics found in merging clusters. These results illustrate the high-quality images that can be obtained with the new JVLA at low radio-frequencies.
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Full orbital solution for the binary system in the northern Galactic disc microlensing event Gaia16aye⋆

Astronomy & Astrophysics EDP Sciences 633 (2020) a98

Authors:

Ł Wyrzykowski, P Mróz, KA Rybicki, M Gromadzki, Z Kołaczkowski, M Zieliński, P Zieliński, N Britavskiy, A Gomboc, K Sokolovsky, ST Hodgkin, L Abe, GF Aldi, A AlMannaei, G Altavilla, A Al Qasim, GC Anupama, S Awiphan, E Bachelet, V Bakış, S Baker, S Bartlett, P Bendjoya, K Benson, IF Bikmaev, G Birenbaum, N Blagorodnova, S Blanco-Cuaresma, S Boeva, AZ Bonanos, V Bozza, DM Bramich, I Bruni, RA Burenin, U Burgaz, T Butterley, HE Caines, DB Caton, S Calchi Novati, JM Carrasco, A Cassan, V Čepas, M Cropper, M Chruślińska, G Clementini, A Clerici, D Conti, M Conti, S Cross, F Cusano, G Damljanovic, A Dapergolas, G D’Ago, JHJ de Bruijne, M Dennefeld, VS Dhillon, M Dominik, J Dziedzic, O Erece, MV Eselevich, H Esenoglu, L Eyer, R Figuera Jaimes, SJ Fossey, AI Galeev, SA Grebenev, AC Gupta, AG Gutaev, N Hallakoun, A Hamanowicz, C Han, B Handzlik, JB Haislip, L Hanlon, LK Hardy, DL Harrison, HJ van Heerden, VL Hoette, K Horne, R Hudec, M Hundertmark, N Ihanec, EN Irtuganov, R Itoh, P Iwanek, MD Jovanovic, R Janulis, M Jelínek, E Jensen, Z Kaczmarek, D Katz, IM Khamitov, Y Kilic, J Klencki, U Kolb, G Kopacki, VV Kouprianov, K Kruszyńska, S Kurowski, G Latev, C-H Lee, S Leonini, G Leto, F Lewis, Z Li, A Liakos, SP Littlefair, J Lu, CJ Manser, S Mao, D Maoz, A Martin-Carrillo, JP Marais, M Maskoliūnas, JR Maund, PJ Meintjes, SS Melnikov, K Ment, P Mikołajczyk, M Morrell, N Mowlavi, D Moździerski, D Murphy, S Nazarov, H Netzel, R Nesci, C-C Ngeow, AJ Norton, EO Ofek, E Pakštienė, L Palaversa, A Pandey, E Paraskeva, M Pawlak, MT Penny, BE Penprase, A Piascik, JL Prieto, JKT Qvam, C Ranc, A Rebassa-Mansergas, DE Reichart, P Reig, L Rhodes, J-P Rivet, G Rixon, D Roberts, P Rosi, DM Russell, R Zanmar Sanchez, G Scarpetta, G Seabroke, BJ Shappee, R Schmidt, Y Shvartzvald, M Sitek, J Skowron, M Śniegowska, C Snodgrass, PS Soares, B van Soelen, ZT Spetsieri, A Stankevičiūtė, IA Steele, RA Street, J Strobl, E Strubble, H Szegedi, LM Tinjaca Ramirez, L Tomasella, Y Tsapras, D Vernet, S Villanueva, O Vince, J Wambsganss, IP van der Westhuizen, K Wiersema, D Wium, RW Wilson, A Yoldas, R Ya Zhuchkov, DG Zhukov, J Zdanavičius, S Zoła, A Zubareva
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