Pulsars, transients and relativistic astrophysics: publications

A numerical study of stellar discs in galactic nuclei

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2022)

Authors:

Taras Panamarev, Bence Kocsis

Abstract:

Abstract We explore the dynamics of stellar discs in the close vicinity of a supermassive black hole (SMBH) by means of direct N-body simulations. We show that an isolated nuclear stellar disc exhibits anisotropic mass segregation meaning that massive stars settle to lower orbital inclinations and more circular orbits than the light stars. However, in systems in which the stellar disc is embedded in a much more massive isotropic stellar cluster, anisotropic mass segregation tends to be suppressed. In both cases, an initially thin stellar disc becomes thicker, especially in the inner parts due to the fluctuating anisotropy in the spherical component. We find that vector resonant relaxation is quenched in the disc by nodal precession, but it is still the most efficient relaxation process around SMBHs of mass 106 M⊙ and above. Two body relaxation may dominate for less massive SMBHs found in dwarf galaxies. Stellar discs embedded in massive isotropic stellar clusters ultimately tend to become isotropic on the local two-body relaxation time-scale. Our simulations show that the dynamics of young stars at the centre of the Milky Way is mostly driven by vector resonant relaxation leading to an anticorrelation between the scatter of orbital inclinations and distance from the SMBH. If the S-stars formed in a disc less than 10 Myr ago, they may coexist with a cusp of stellar mass black holes or an intermediate mass black hole with mass up to 1000 M⊙ to reproduce the observed scatter of angular momenta.

The rise and fall of the iron-strong nuclear transient PS16dtm

(2022)

Authors:

T Petrushevska, G Leloudas, D Ilic, M Bronikowski, P Charalampopoulos, GK Jaisawal, E Paraskeva, M Pursiainen, N Rakic, S Schulze, K Taggart, CK Wedderkopp, JP Anderson, T de Boer, K Chambers, TW Chen, G Damljanovic, M Fraser, H Gao, A Gomboc, M Gromadzki, N Ihanec, K Maguire, B Marcun, TE Muller-Bravo, M Nicholl, F Onori, TM Reynolds, SJ Smartt, J Sollerman, KW Smith, T Wevers, L Wyrzykowski

Comprehensive coverage of particle acceleration and kinetic feedback from the stellar mass black hole V404 Cygni

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 518:1 (2022) 1243-1259

Authors:

RP Fender, KP Mooley, SE Motta, JS Bright, DRA Williams, AP Rushton, RJ Beswick, JCA Miller-Jones, M Kimura, K Isogai, T Kato

The Dark Energy Survey supernova program: cosmological biases from supernova photometric classification

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 518:1 (2022) 1106-1127

Authors:

M Vincenzi, M Sullivan, A Möller, P Armstrong, BA Bassett, D Brout, D Carollo, A Carr, TM Davis, C Frohmaier, L Galbany, K Glazebrook, O Graur, L Kelsey, R Kessler, E Kovacs, GF Lewis, C Lidman, U Malik, RC Nichol, B Popovic, M Sako, D Scolnic, M Smith, G Taylor, BE Tucker, P Wiseman, M Aguena, S Allam, J Annis, J Asorey, D Bacon, E Bertin, D Brooks, DL Burke, A Carnero Rosell, J Carretero, FJ Castander, M Costanzi, LN da Costa, MES Pereira, J De Vicente, S Desai, HT Diehl, P Doel, S Everett, I Ferrero, B Flaugher, P Fosalba, J Frieman, J García-Bellido, DW Gerdes, D Gruen, G Gutierrez, SR Hinton, DL Hollowood, K Honscheid, DJ James, K Kuehn, N Kuropatkin, O Lahav, TS Li, M Lima, MAG Maia, JL Marshall, R Miquel, R Morgan, RLC Ogando, A Palmese, F Paz-Chinchón, A Pieres, AA Plazas Malagón, K Reil, A Roodman, E Sanchez, M Schubnell, S Serrano, I Sevilla-Noarbe, E Suchyta, G Tarle, C To, TN Varga, J Weller, RD Wilkinson

The Thousand-Pulsar-Array program on MeerKAT -- IX. The time-averaged properties of the observed pulsar population

(2022)

Authors:

B Posselt, A Karastergiou, S Johnston, A Parthasarathy, LS Oswald, RA Main, A Basu, MJ Keith, X Song, P Weltevrede, C Tiburzi, M Bailes, S Buchner, M Geyer, M Kramer, R Spiewak, V Venkatraman Krishnan

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