FR-type radio sources at 3 GHz VLA-COSMOS: Relation to physical properties and large-scale environment

Vardoulaki, E.; Andrade, Eric F. Jiménez; Delvecchio, I.; Smolčić, Vernesa; Schinnerer, E.; Sargent, M.; Gozaliasl, G.; Finoguenov, A.; Bondì, M.; Zamorani, G.; Badescu, T.; Leslie, S. K.; Ceraj, Lana; Tisanić, Krešimir; Karim, A.; Magnelli, B.; Bertoldi, F.; Romano-Díaz, Emilio; Harrington, Kevin

doi:10.1051/0004-6361/202039488

Cited by 21 publications

(31 citation statements)

References 97 publications

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“…However, this does not directly translate to the same factor in bright, or detected, radio (or Xray) sources. Recent work looking at active galactic nucleus (AGN) galaxies in the COSMOS field (Schinnerer et al 2007;Vardoulaki et al 2021) did not find a significant difference in galaxy density when comparing field AGN with those in clusters or filaments. Therefore, for the detected signal to be caused by an overdensity of radio galaxies inside filaments, would mean it would have to be fainter sources (below those detected in the deep COSMOS data) and those fainter sources would have to have much higher numbers in filaments, both in comparison to brighter galaxies and fainter field galaxies.…”

Section: Source Contributionmentioning

confidence: 96%

Discovery of magnetic fields along stacked cosmic filaments as revealed by radio and X-ray emission

Vernstrom

Heald

Vazza

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Diffuse filaments connect galaxy clusters to form the cosmic web. Detecting these filaments could yield information on the magnetic field strength, cosmic ray population and temperature of intercluster gas, yet, the faint and large-scale nature of these bridges makes direct detections very challenging. Using multiple independent all-sky radio and X-ray maps we stack pairs of luminous red galaxies as tracers for cluster pairs. For the first time, we detect an average surface brightness between the clusters from synchrotron (radio) and thermal (X-ray) emission with ≳ 5σ significance, on physical scales larger than observed to date (≥3 Mpc). We obtain a synchrotron spectral index of α ≃ −1.0 and estimates of the average magnetic field strength of 30 ≤ B ≤ 60 nG, derived from both equipartition and Inverse Compton arguments, implying a 5 to 15 per cent degree of field regularity when compared with Faraday rotation measure estimates. While the X-ray detection is inline with predictions, the average radio signal comes out higher than predicted by cosmological simulations and dark matter annihilation and decay models. This discovery demonstrates that there are connective structures between mass concentrations that are significantly magnetised, and the presence of sufficient cosmic rays to produce detectable synchrotron radiation.

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Section: Source Contributionmentioning

confidence: 96%

Discovery of magnetic fields along stacked cosmic filaments as revealed by radio and X-ray emission

Vernstrom

Heald

Vazza

et al. 2021

Monthly Notices of the Royal Astronomical Society

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“…The sample is drawn from Vardoulaki et al [16], who classified the extended radio AGN at 3 GHz VLA-COSMOS based on the classification scheme of Fanaroff and Riley [17] as FRII or edge-brightened, FRI or edge darkened, and added to that a classification of hybrid FRI/FRII objects; the latter have a jet on one side and a lobe on the other. We deem objects that fall into these classes FR-type radio sources throughout the paper.…”

Section: Samplementioning

confidence: 99%

“…We deem objects that fall into these classes FR-type radio sources throughout the paper. From the 130 FRs reported in [16], we use 108 for the current analysis where bent angles (BA) are available. These were measured through visual inspection of the projected sources, which could add a source of uncertainty.…”

Section: Samplementioning

confidence: 99%

“…These were measured through visual inspection of the projected sources, which could add a source of uncertainty. The values can be found in [16]. The BA is given in degrees and is the angle formed between jets/lobes with respect to each other in a twosided source (Figure 1).…”

Section: Samplementioning

confidence: 99%

“…The BA is given in degrees and is the angle formed between jets/lobes with respect to each other in a twosided source (Figure 1). The Vardoulaki et al [16] sample also includes jet-less radio AGN and star-forming galaxies, which we do not include in this analysis due to their jet-less radio structure. [16] , for BA = 180 • (left), 139 • (middle), and 57 • (right).…”

Section: Samplementioning

confidence: 99%

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Bent It Like FRs: Extended Radio AGN in the COSMOS Field and Their Large-Scale Environment

et al. 2021

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A fascinating topic in radio astronomy is how to associate the complexity of observed radio structures with their environment in order to understand their interplay and the reason for the plethora of radio structures found in surveys. In this project, we explore the distortion of the radio structure of Fanaroff–Riley (FR)-type radio sources in the VLA-COSMOS Large Project at 3 GHz and relate it to their large-scale environment. We quantify the distortion by using the angle formed between the jets/lobes of two-sided FRs, namely bent angle (BA). Our sample includes 108 objects in the redshift range 0.08<z<3, which we cross-correlate to a wide range of large-scale environments (X-ray galaxy groups, density fields, and cosmic web probes) in the COSMOS field. The median BA of FRs in COSMOS at zmed∼0.9 is 167.5−37.5+11.5 degrees. We do not find significant correlations between BA and large-scale environments within COSMOS covering scales from a few kpc to several hundred Mpc, nor between BA and host properties. Finally, we compare our observational data to magnetohydrodynamical (MHD) adaptive-mesh simulations ENZO-MHD of two FR sources at z = 0.5 and at z = 1. Although the scatter in BA of the observed data is large, we see an agreement between observations and simulations in the bent angles of FRs, following a mild redshift evolution with BA. We conclude that, for a given object, the dominant mechanism affecting the radio structures of FRs could be the evolution of the ambient medium, where higher densities of the intergalactic medium at lower redshifts as probed by our study allow more space for jet interactions.

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Continuum Source Identification and Measurement

Hopkins,

Gordon,

Hardcastle

et al. 2024

Astrophysics and Space Science Library

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FR-type radio sources at 3 GHz VLA-COSMOS: Relation to physical properties and large-scale environment

Abstract: A et al. (2020) FR-type radio sources at 3 GHz VLA-COSMOS: relation to physical properties and large-scale environment. Astronomy and Astrophysics. pp. 1-49.

Cited by 21 publications

References 97 publications

Discovery of magnetic fields along stacked cosmic filaments as revealed by radio and X-ray emission

Discovery of magnetic fields along stacked cosmic filaments as revealed by radio and X-ray emission

Bent It Like FRs: Extended Radio AGN in the COSMOS Field and Their Large-Scale Environment

Continuum Source Identification and Measurement

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