Pulsars, transients and relativistic astrophysics

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A fast radio burst with frequency-dependent polarization detected during Breakthrough Listen observations

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 486:3 (2019) 3636-3646

Authors:

DC Price, G Foster, M Geyer, W van Straten, V Gajjar, G Hellbourg, A Karastergiou, EF Keane, APV Siemion, I Arcavi, R Bhat, M Caleb, S-W Chang, S Croft, D DeBoer, I de Pater, J Drew, JE Enriquez, W Farah, N Gizani, JA Green, H Isaacson, J Hickish, A Jameson, M Lebofsky, DHE MacMahon, A Möller, CA Onken, E Petroff, D Werthimer, C Wolf, SP Worden, YG Zhang
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SN 2017gmr: An energetic Type II-P supernova with asymmetries

(2019)

Authors:

Jennifer E Andrews, DJ Sand, S Valenti, Nathan Smith, Raya Dastidar, DK Sahu, Kuntal Misra, Avinash Singh, D Hiramatsu, PJ Brown, G Hosseinzadeh, S Wyatt, J Vinko, GC Anupama, I Arcavi, Chris Ashall, S Benetti, Marco Berton, KA Bostroem, M Bulla, J Burke, S Chen, L Chomiuk, A Cikota, E Congiu, B Cseh, Scott Davis, N Elias-Rosa, T Faran, Morgan Fraser, L Galbany, C Gall, A Gal-Yam, Anjasha Gangopadhyay, M Gromadzki, J Haislip, DA Howell, EY Hsiao, C Inserra, E Kankare, H Kuncarayakti, V Kouprianov, Brajesh Kumar, Xue Li, Han Lin, K Maguire, P Mazzali, C McCully, P Milne, Jun Mo, N Morrell, M Nicholl, P Ochner, F Olivares, A Pastorello, F Patat, M Phillips, G Pignata, S Prentice, A Reguitti, DE Reichart, Ó Rodríguez, Liming Rui, Pankaj Sanwal, K Sárneczky, M Shahbandeh, Mridweeka Singh, S Smartt, J Strader, MD Stritzinger, R Szakáts, L Tartaglia, Huijuan Wang, Lingzhi Wang, Xiaofeng Wang, JC Wheeler, Danfeng Xang, O Yaron, DR Young, Junbo Zhang
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Accretion and Outflow in V404 Cyg

(2019)

Authors:

J Casares, T Muñoz-Darias, D Mata Sanchez, PA Charles, MAP Torres, M Armas Padilla, RP Fender, J Garcia-Rojas
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Cosmic ray acceleration by shocks: spectral steepening due to turbulent magnetic field amplification

(2019)

Authors:

Anthony Bell, James Matthews, Katherine Blundell
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Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070

Astrophysical Journal Letters IOP Science 879:1 (2019) L4

Authors:

T Munoz-Darias, F Jimenez-Ibarra, G Panizo-Espinar, J Casares, D Mata Sanchez, G Ponti, Rp Fender, Dah Buckley, P Garnavich, Map Torres, M Armas Padilla, Pa Charles, Jm Corral-Santana, Jje Kajava, Ej Kotze, C Littlefield, J Sanchez-Sierras, D Steeghs, J Thomas

Abstract:

We report on a detailed optical spectroscopic follow-up of the black hole (BH) transient MAXI J1820+070 (ASASSN-18ey). The observations cover the main part of the X-ray binary outburst, when the source alternated between hard and soft states following the classical pattern widely seen in other systems. We focus the analysis on the He i emission lines at 5876 and 6678 as well as on Hα. We detect clear accretion disk wind features (P-Cyg profiles and broad emission line wings) in the hard state, both during outburst rise and decay. These are not witnessed during the several months long soft state. However, our data suggest that the visibility of the outflow might be significantly affected by the ionization state of the accretion disk. The terminal velocity of the wind is above ∼1200 km s , which is similar to outflow velocities derived from (hard-state) optical winds and (soft-state) X-ray winds in other systems. The wind signatures, in particular the P-Cyg profiles, are very shallow, and their detection has only been possible thanks to a combination of source brightness and intense monitoring at very high signal-to-noise. This study indicates that cold, optical winds are most likely a common feature of BH accretion, and therefore, that wind-like outflows are a general mechanism of mass and angular momentum removal operating throughout the entire X-ray binary outburst. -1
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