Galaxy formation and evolution

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Quantification of Unknown Unknowns in Astronomy and Physics

ArXiv 2207.13993 (2022)
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First Insights into the ISM at $z>8$ with JWST: Possible Physical Implications of a High [O III]$\mathbf{\lambda 4363}$/[O III]$\mathbf{\lambda 5007}$

(2022)

Authors:

Harley Katz, Aayush Saxena, Alex J Cameron, Stefano Carniani, Andrew J Bunker, Santiago Arribas, Rachana Bhatawdekar, Rebecca AA Bowler, Kristan NK Boyett, Giovanni Cresci, Emma Curtis-Lake, Francesco D'Eugenio, Nimisha Kumari, Tobias J Looser, Roberto Maiolino, Hannah Ubler, Chris Willott, Joris Witstok
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The curious case of the "Heartworm" Nebula

Astrophysical Journal IOP Publishing 934:1 (2022) 78

Authors:

WD Cotton, F Camilo, W Becker, JJ Condon, J Forbrich, Ian Heywood, B Hugo, S Legodi, T Mauch, P Predehl, P Slane, MA Thompson

Abstract:

The curious Galactic features near G357.2−0.2 were observed with the MeerKAT radio interferometer array in the UHF and L bands (0.56–1.68 GHz). There are two possibly related features: a newly identified faint heart-shaped partial shell (the "heart"), and a series of previously known but now much better imaged narrow, curved features (the "worm") interior to the heart. Polarized emission suggests that much of the emission is nonthermal and is embedded in a dense plasma. The filaments of the worm appear to be magnetic structures powered by embedded knots that are sites of particle acceleration. The morphology of the worm broadly resembles some known pulsar wind nebulae (PWNe) but there is no known pulsar or PWN which could be powering this structure. We also present eROSITA observations of the field; no part of the nebula is detected in X-rays, but the current limits do not preclude the existence of a pulsar/PWN of intermediate spin-down luminosity.
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MIGHTEE: the nature of the radio-loud AGN population

ArXiv 2207.12379 (2022)

Authors:

IH Whittam, MJ Jarvis, CL Hale, M Prescott, LK Morabito, I Heywood, NJ Adams, J Afonso, Fangxia An, Y Ao, RA Bowler, JD Collier, RP Deane, J Delhaize, B Frank, M Glowacki, PW Hatfield, N Maddox, L Marchetti, AM Matthews, I Prandoni, S Randriamampandry, Z Randriamanakoto, DJB Smith, AR Taylor, NL Thomas, M Vaccari
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The chemical enrichment in the early Universe as probed by JWST via direct metallicity measurements at z~8

(2022)

Authors:

M Curti, F D'Eugenio, S Carniani, R Maiolino, L Sandles, J Witstok, WM Baker, JS Bennett, JM Piotrowska, S Tacchella, S Charlot, K Nakajima, G Maheson, F Mannucci, A Amiri, S Arribas, F Belfiore, NR Bonaventura, AJ Bunker, J Chevallard, G Cresci, E Curtis-Lake, C Hayden-Pawson, N Kumari, I Laseter, TJ Looser, A Marconi, MV Maseda, GC Jones, J Scholtz, R Smit, H Ubler, IEB Wallace
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