A Wide‐Angle Tail Radio Galaxy in the COSMOS Field: Evidence for Cluster Formation

Smolčić, Vernesa; Schinnerer, E.; Finoguenov, A.; Sakelliou, I.; Carilli, Christopher L.; Botzler, C. S.; Brusa, M.; Scoville, N. Z.; Ajiki, Masaru; Capak, P.; Guzzo, L.; Hasinger, G.; Impey, C. D.; Jahnke, K.; Kartaltepe, Jeyhan S.; McCracken, H. J.; Mobasher, Bahram; Murayama, Takashi; Sasaki, S.; Shioya, Yasuhiro; Taniguchi, Yoshiaki; Trump, Jonathan R.

doi:10.1086/516583

Cited by 46 publications

(51 citation statements)

References 79 publications

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“…Bent-tailed sources are of particular interest because they are known to inhabit galaxy clusters and can act as tracers of highredshift clusters and of cluster mergers (e.g. Blanton et al 2001;Smolčić et al 2007;Giacintucci & Venturi 2009;Mao et al 2010;Garon et al 2019, and references therein). The tails of these sources are believed to arise from a combination of the hosts moving through the intracluster medium (ICM), dragging the emission behind them, and strong cluster winds pushing the tails away from their hosts.…”

Section: Narrow and Wide Angle Tail Sourcesmentioning

confidence: 99%

Revisiting the Fanaroff–Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)

Mingo

Croston

Hardcastle

et al. 2019

Monthly Notices of the Royal Astronomical Society

190

223

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Abstract The relative positions of the high and low surface brightness regions of radio-loud active galaxies in the 3CR sample were found by Fanaroff and Riley to be correlated with their luminosity. We revisit this canonical relationship with a sample of 5805 extended radio-loud active galactic nuclei (AGN) from the LOFAR Two-Metre Sky Survey (LoTSS), compiling the most complete data set of radio-galaxy morphological information obtained to date. We demonstrate that, for this sample, radio luminosity does not reliably predict whether a source is edge-brightened (FRII) or centre-brightened (FRI). We highlight a large population of low-luminosity FRIIs, extending three orders of magnitude below the traditional FR break, and demonstrate that their host galaxies are on average systematically fainter than those of high-luminosity FRIIs and of FRIs matched in luminosity. This result supports the jet power/environment paradigm for the FR break: low-power jets may remain undisrupted and form hotspots in lower mass hosts. We also find substantial populations that appear physically distinct from the traditional FR classes, including candidate restarting sources and ‘hybrids’. We identify 459 bent-tailed sources, which we find to have a significantly higher SDSS cluster association fraction (at z < 0.4) than the general radio-galaxy population, similar to the results of previous work. The complexity of the LoTSS faint, extended radio sources not only demonstrates the need for caution in the automated classification and interpretation of extended sources in modern radio surveys, but also reveals the wealth of morphological information such surveys will provide and its value for advancing our physical understanding of radio-loud AGN.

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Section: Narrow and Wide Angle Tail Sourcesmentioning

confidence: 99%

Revisiting the Fanaroff–Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)

Mingo

Croston

Hardcastle

et al. 2019

Monthly Notices of the Royal Astronomical Society

190

223

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“…Previous studies indicated that bent-double radio sources are associated with galaxy clusters (Blanton et al , 2001(Blanton et al , 2003aSmolčić et al 2007;Kantharia et al 2009;Giacintucci & Venturi 2009;Oklopčić et al 2010). Identifying these sources in radio catalogs and then searching for optical counterparts can define a sample of radio-selected galaxy clusters.…”

Section: Selecting Radio Sourcesmentioning

confidence: 99%

Galaxy Cluster Environments of Radio Sources

Wing¹,

Blanton²

2011

The Astronomical Journal

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Using the Sloan Digital Sky Survey (SDSS) and the Faint Images of the Radio Sky at Twenty Centimeters (FIRST) catalogs, we examined the optical environments around double-lobed radio sources. Previous studies have shown that multi-component radio sources exhibiting some degree of bending between components are likely to be found in galaxy clusters. Often this radio emission is associated with a cD-type galaxy at the center of a cluster. We cross-correlated the SDSS and FIRST catalogs and measured the richness of the cluster environments surrounding both bent and straight multi-component radio sources. This led to the discovery and classification of a large number of galaxy clusters out to a redshift of z ∼ 0.5. We divided our sample into smaller subgroups based on their optical and radio properties. We find that FR I radio sources are more likely to be found in galaxy clusters than FR II sources. Further, we find that bent radio sources are more often found in galaxy clusters than non-bent radio sources. We also examined the environments around single-component radio sources and find that single-component radio sources are less likely to be associated with galaxy clusters than extended, multi-component radio sources. Bent, visually selected sources are found in clusters or rich groups ∼78% of the time. Those without optical hosts in SDSS are likely associated with clusters at even higher redshifts, most with redshifts of z > 0.7.

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“…Several previously unobserved clusters have been actually identified thanks to the detection of tailed sources (e.g. Blanton et al 2003;Smolčić et al 2007;Giacintucci & Venturi 2009;Kantharia et al 2009;Mao et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Discovery of large-scale diffuse radio emission and of a new galaxy cluster in the surroundings of MACS J0520.7-1328

Macario

Intema

Ferrari

et al. 2014

A&A

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We report the discovery of large-scale diffuse radio emission south-east of the galaxy cluster MACS J0520.7-1328, detected through high-sensitivity Giant Metrewave Radio Telescope 323 MHz observations. This emission is dominated by an elongated diffuse radio source and surrounded by other features of lower surface brightness. Patches of these faint sources are marginally detected in a 1.4 GHz image obtained through a re-analysis of archival NVSS data. Interestingly, the elongated radio source coincides with a previously unclassified extended X-ray source. We perform a multi-wavelength analysis based on archival infrared, optical, and X-ray Chandra data. We find that this source is a low-temperature (∼3.6 keV) cluster of galaxies, with indications of a disturbed dynamical state, located at a redshift that is consistent with the one of the main galaxy cluster MACS J0520.7-132 (z = 0.336). We suggest that the diffuse radio emission is associated to non-thermal components in the intracluster and intergalactic medium in and around the newly detected cluster. We are planning deeper multi-wavelength and multi-frequency radio observations to accurately investigate the dynamical scenario of the two clusters and to address the nature of the complex radio emission more precisely.

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A Wide‐Angle Tail Radio Galaxy in the COSMOS Field: Evidence for Cluster Formation

Cited by 46 publications

References 79 publications

Revisiting the Fanaroff–Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)

Revisiting the Fanaroff–Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)

Galaxy Cluster Environments of Radio Sources

Discovery of large-scale diffuse radio emission and of a new galaxy cluster in the surroundings of MACS J0520.7-1328

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