Exploring the properties of low-frequency radio emission and magnetic fields in a sample of compact galaxy groups using the LOFAR Two-Metre Sky Survey (LoTSS)
Journal article, 2019

We use the LOFAR Two-metre Sky Survey (LoTSS) Data Release I to identify the groups of galaxies (and individual galaxies) from the Hickson compact groups (HCG) and magnitude-limited compact groups (MLCG) samples that emit at the frequency of 150 MHz, characterise their radio emission (extended or limited to the galaxies), and compare new results to earlier observations and theoretical predictions. The detection of 73 systems (and 7 more - probably) out of 120, of which as many as 17 show the presence of extended radio structures, confirms the previous hypothesis of the common character of the magnetic field inside galaxy groups and its detectability. In order to investigate the future potential of low-frequency radio studies of galaxy groups, we also present a more detailed insight into four radio-emitting systems, for which the strength of the magnetic field inside their intergalactic medium (IGM) is calculated. The estimated values are comparable to that found inside star-forming galaxies, suggesting a dynamical and evolutionary importance of the magnetic field in galaxy groups.

Galaxies: magnetic fields

Galaxies: groups: general

Radio continuum: galaxies

Magnetic fields


N. Nikiel-Wroczynski

Jagiellonian University in Kraków

A. Berger

Ruhr-Universität Bochum

N. Herrera Ruiz

Ruhr-Universität Bochum

D. Bomans

Ruhr-Universität Bochum

S. Blex

Ruhr-Universität Bochum

Cathy Horellou

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Extragalactic Astrophysics

R. Paladino

INAF OAS Bologna

A. Becker

Ruhr-Universität Bochum

A. Miskolczi

Ruhr-Universität Bochum

R. Beck

Max Planck Society

K. T. Chy

Jagiellonian University in Kraków

R. -J. Dettmar

Ruhr-Universität Bochum

G. Heald

CSIRO Astronomy and Space Science

V. Heesen

Universität Hamburg

M. Jamrozy

Jagiellonian University in Kraków

T. W. Shimwell

Netherlands Institute for Radio Astronomy (ASTRON)

C. Tasse

Paris Diderot University

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 622 201833934

Subject Categories

Astronomy, Astrophysics and Cosmology

Other Physics Topics

Biomedical Laboratory Science/Technology



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