The Square Kilometre Array (SKA)

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On the relationship between the cosmic web and the alignment of galaxies and AGN jets

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025)

Authors:

S Lyla Jung, IH Whittam, MJ Jarvis, CL Hale, MN Tudorache, T Yasin

Abstract:

Abstract The impact of active galactic nuclei (AGN) on the evolution of galaxies explains the steep decrease in the number density of the most massive galaxies in the Universe. However, the fueling of the AGN and the efficiency of this feedback largely depend on their environment. We use data from the Low Frequency Array (LOFAR) Two-metre Sky Survey Data Release 2 (LoTSS DR2), the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys, and the Sloan Digital Sky Survey (SDSS) DR12 to make the first study of the orientations of radio jets and their optical counterpart in relation to the cosmic web environment. We find that close to filaments ($\lesssim 11 \, \rm Mpc$), galaxies tend to have their optical major axes aligned with the nearest filaments. On the other hand, radio jets, which are generally aligned perpendicularly to the optical major axis of the host galaxy, show more randomised orientations with respect to host galaxies within $\lesssim 8 \, \rm Mpc$ of filaments. These results support the scenario that massive galaxies in cosmic filaments grow by numerous mergers directed along the orientation of the filaments while experiencing chaotic accretion of gas onto the central black hole. The AGN-driven jets consequently have a strong impact preferentially along the minor axes of dark matter halos within filaments. We discuss the implications of these results for large-scale radio jet alignments, intrinsic alignments between galaxies, and the azimuthal anisotropy of the distribution of circumgalactic medium and anisotropic quenching.
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A MeerKAT survey of nearby dwarf novae: I. New detections

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025) staf556

Authors:

J Kersten, E Körding, PA Woudt, PJ Groot, DRA Williams, I Heywood, DL Coppejans, C Knigge, JCA Miller-Jones, GR Sivakoff, R Fender
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Anomaly Detection and Radio-frequency Interference Classification with Unsupervised Learning in Narrowband Radio Technosignature Searches

The Astronomical Journal American Astronomical Society 169:4 (2025) 206

Authors:

Ben Jacobson-Bell, Steve Croft, Carmen Choza, Alex Andersson, Daniel Bautista, Vishal Gajjar, Matthew Lebofsky, David HE MacMahon, Caleb Painter, Andrew PV Siemion
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New Constraints on the Evolution of the MH i−M⋆ Scaling Relation Combining CHILES and MIGHTEE-H i Data

The Astrophysical Journal American Astronomical Society 982:2 (2025) 82

Authors:

Alessandro Bianchetti, Francesco Sinigaglia, Giulia Rodighiero, Ed Elson, Mattia Vaccari, DJ Pisano, Nicholas Luber, Isabella Prandoni, Kelley Hess, Maarten Baes, Elizabeth AK Adams, Filippo M Maccagni, Alvio Renzini, Laura Bisigello, Min Yun, Emmanuel Momjian, Hansung B Gim, Hengxing Pan, Thomas A Oosterloo, Richard Dodson, Danielle Lucero, Bradley S Frank, Olivier Ilbert, Luke JM Davies, Ali A Khostovan, Mara Salvato
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Publisher Correction: Sporadic radio pulses from a white dwarf binary at the orbital period

Nature Astronomy Springer Nature (2025) 1-1

Authors:

I de Ruiter, KM Rajwade, CG Bassa, A Rowlinson, RAMJ Wijers, CD Kilpatrick, G Stefansson, JR Callingham, JWT Hessels, TE Clarke, W Peters, RAD Wijnands, TW Shimwell, S ter Veen, V Morello, GR Zeimann, S Mahadevan
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