Intergalactic magnetic fields in Stephan's Quintet

Abstract

We present results of the VLA radio continuum total power and polarised intensity observations of Stephan's Quintet at 1.43 and 4.86 GHz along with complementary 4.85 and 8.35 GHz Effelsberg observations. Our study shows a large envelope of radio emission encompassing all the member galaxies and hence a large volume of intergalac- tic matter. Infall of the galaxy NGC 7318B produces a ridge of intergalactic, polarised emission, for which the magnetic field strength was estimated as 11.0 \pm 2.2 μG, with an ordered component of 2.6 \pm 0.8 μG. The energy density of the field within the ridge area is of the same order as estimates of the thermal component, implying a significant role of the magnetic field in the dynamics of the intergalactic matter. We also report that the tidal dwarf galaxy candidate SQ-B possesses a strong and highly anisotropic magnetic field with the total strength being equal to 6.5 \pm 1.9 μG and an ordered component reaching 3.5 \pm 1.2 μG, which is comparable to that found in normal-sized galaxies.

10 pages, 8 figures, accepted for publication in MNRAS

References in corpus (4)

• Powerful High Velocity-Dispersion Molecular Hydrogen Associated with an Intergalactic Shock Wave in Stephan's Quintet
• Magnetic fields and ionized gas in nearby late type galaxies
• The magnetic fields of large Virgo cluster spirals: Paper II
• Synthetic X-ray and radio maps for two different models of Stephan's Quintet

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• Detection of a Coherent Magnetic Field in the Magellanic Bridge through Faraday Rotation
• Generation of large-scale magnetic fields, non-Gaussianity, and primordial gravitational waves in inflationary cosmology
• The origin of the X-ray, radio and HI structures in the NGC 5903 galaxy group
• Fast magnetic field amplification in the early Universe: growth of collisionless plasma instabilities in turbulent media
• Revealing the Faraday Depth Structure of Radio Galaxy NGC 612 with Broad-Band Radio Polarimetric Observations
• 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)
• WEAVE First Light Observations: Origin and Dynamics of the Shock Front in Stephan's Quintet
• Gas and stellar dynamics in Stephan's Quintet: Mapping the kinematics in a closely interacting compact galaxy group
• A search for extended radio emission from selected compact galaxy groups
• A large-scale, regular intergalactic magnetic field associated with Stephan's Quintet?
• Multiwavelength study of the radio emission from a tight galaxy pair Arp 143
• Somewhere in between: Tracing the Radio Emission from Galaxy Groups (or Why Does the Future of Observing Galaxy Groups with Radio Telescopes Look Promising?)
• Searching for the magnetised Tidal Dwarf Galaxies in Hickson Compact Groups: HCG 26, 91, and 96
• Radio continuum emission from a tidal dwarf galaxy
• Redshift effects implications on revised models of Stephan's quintet