Hintze Centre for Astrophysical Surveys

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A multi-wavelength study of GRS 1716-249 in outburst : constraints on its system parameters

(2022)

Authors:

Payaswini Saikia, David M Russell, MC Baglio, DM Bramich, Piergiorgio Casella, M Diaz Trigo, Poshak Gandhi, Jiachen Jiang, Thomas Maccarone, Roberto Soria, Hind Al Noori, Aisha Al Yazeedi, Kevin Alabarta, Tomaso Belloni, Marion Cadolle Bel, Chiara Ceccobello, Stephane Corbel, Rob Fender, Elena Gallo, Jeroen Homan, Karri Koljonen, Fraser Lewis, Sera B Markoff, James CA Miller-Jones, Jerome Rodriguez, Thomas D Russell, Tariq Shahbaz, Gregory R Sivakoff, Vincenzo Testa, Alexandra J Tetarenko
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On the robustness of triaxial Schwarzschild modelling: The effects of correcting the orbit mirroring

ArXiv 2205.04165 (2022)

Authors:

Sabine Thater, Prashin Jethwa, Behzad Tahmasebzadeh, Ling Zhu, Mark den Brok, Giulia Santucci, Yuchen Ding, Adriano Poci, Edward Lilley, P Tim de Zeeuw, Alice Zocchi, Thomas I Maindl, Fabio Rigamonti, Glenn van de Ven, Meng Yang, Katja Fahrion
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Long-term radio monitoring of the neutron star X-ray binary Swift J1858.6−0814

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 513:2 (2022) 2708-2718

Authors:

L Rhodes, RP Fender, S Motta, J van den Eijnden, DRA Williams, J Bright, GR Sivakoff
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Jet-cocoon geometry in the optically dark, very high energy gamma-ray burst 201216C

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 513:2 (2022) 1895-1909

Authors:

L Rhodes, AJ van der Horst, R Fender, DR Aguilera-Dena, JS Bright, S Vergani, DRA Williams
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The SAMI Galaxy Survey: the link between [α/Fe] and kinematic morphology

Monthly Notices of the Royal Astronomical Society Oxford University Press 513:4 (2022) 5076-5087

Authors:

Peter J Watson, Roger L Davies, Jesse van de Sande, Sarah Brough, Scott M Croom, Francesco D'Eugenio, Karl Glazebrook, Brent Groves, Angel R Lopez-Sanchez, Nicholas Scott, Sam P Vaughan, C Jakob Walcher, Joss Bland-Hawthorn, Julia J Bryant, Michael Goodwin, Jon S Lawrence, Nuria PF Lorente, Matt S Owers, Samuel Richards

Abstract:

We explore a sample of 1492 galaxies with measurements of the mean stellar population properties and the spin parameter proxy, λRe⁠, drawn from the SAMI Galaxy Survey. We fit a global [α/Fe]–σ relation, finding that [α/Fe]=(0.395±0.010)log10(σ)−(0.627±0.002)⁠. We observe an anti-correlation between the residuals Δ[α/Fe] and the inclination-corrected λeoRe⁠, which can be expressed as Δ[α/Fe]=(−0.057±0.008)λeoRe+(0.020±0.003)⁠. The anti-correlation appears to be driven by star-forming galaxies, with a gradient of Δ[α/Fe]∼(−0.121±0.015)λeoRe⁠, although a weak relationship persists for the subsample of galaxies for which star formation has been quenched. We take this to be confirmation that disc-dominated galaxies have an extended duration of star formation. At a reference velocity dispersion of 200 km s−1, we estimate an increase in half-mass formation time from ∼0.5 Gyr to ∼1.2 Gyr from low- to high-λeoRe galaxies. Slow rotators do not appear to fit these trends. Their residual α-enhancement is indistinguishable from other galaxies with λeoRe⪅0.4⁠, despite being both larger and more massive. This result shows that galaxies with λeoRe⪅0.4 experience a similar range of star formation histories, despite their different physical structure and angular momentum.
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