Jets in the Fanaroff-Riley class I radio galaxies PKS B1234−723, MRC 1452−517 and PKS B2148−555

Lloyd, Ben D.; Jones, P. A.

doi:10.1046/j.1365-8711.2002.05239.x

Cited by 10 publications

(7 citation statements)

References 34 publications

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“…However, Figure 1 definitely shows diffuse X-ray emission in the field of view (FOV) of this radio source. As reported by Lloyd & Jones (2002), this FR I radio galaxy is the brightest galaxy in Abell cluster A3816, with a largest angular size of 14′.…”

Section: The Case Of Pks B2148-555supporting

confidence: 77%

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A Swift X-Ray View of the SMS4 Sample—X-Ray Properties of 31 Quasars and Radio Galaxies

Maselli¹,

Forman²,

Jones³

et al. 2022

ApJS

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We present Neil Gehrels Swift Observatory (hereafter Swift) observations of 31 sources from the SMS4 catalog, a sample of 137 bright radio sources originally designed to extend the well-studied 3CRR radio sample to the Southern Hemisphere. All these sources had no Chandra or XMM-Newton observations: 24 of these were observed with Swift through a dedicated proposal in 2015, and data for the remaining seven were retrieved from the Swift archive. The reduction and analysis of data collected by the Swift X-ray Telescope (XRT) led to 20 detections in the 0.3–10 keV band. We provide details of the X-ray emission in this band for these 20 detections, as well as upper limits for the remaining 11 SMS4 sources. When statistics allowed, we investigated the extent of the X-ray emission and the hardness ratio, and we carried out a spectral analysis. We matched the 20 X-ray-detected sources with infrared (AllWISE, CatWISE2020) and optical (GSC 2.3.2, DES DR2) catalogs to establish associations with infrared and optical sources and compared our results with previously published counterparts in these bands. Requiring a detection in both the infrared and optical bands to establish a candidate counterpart for our X-ray detections, we obtain reliable counterparts for 18 sources, while the remaining two sources need further investigation to establish firm identifications. In the infrared, we confirm 12 previously established counterparts and provide six new candidates. In the optical, we find agreement with 13 previously established counterparts, while we provide an alternative candidate for five SMS4 sources. We find that ∼35% of all the SMS4 sources lie below the lower limit of 10.9 Jy for the flux density at 178 MHz established for the 3CRR sample, at variance with the values extrapolated using measurements at higher frequencies. Therefore, for future studies where flux-density-limited samples are needed, we encourage the use of the more recent G4Jy sample. We present the list of 56 SMS4 sources that in 2022 March remain to be observed in the X-rays with narrow-field instruments, to highlight interesting sources and organize further observational campaigns to achieve complete X-ray coverage for the whole SMS4 in the forthcoming years.

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Section: The Case Of Pks B2148-555supporting

confidence: 77%

“…We notice the presence, among these 28 sources, of PKS B2148−555, which is one of the 78 G4Jy sources with which, due to their extension, more than one GLEAM component was associated by W20. High-resolution ATCA maps in Lloyd & Jones (2002) show the details of the emission of this relevant radio galaxy.…”

Section: Description Of Our Sample Of Sms4 Sourcesmentioning

confidence: 99%

A Swift X-Ray View of the SMS4 Sample—X-Ray Properties of 31 Quasars and Radio Galaxies

Maselli¹,

Forman²,

Jones³

et al. 2022

ApJS

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“…Previous studies of polarisation inside the jets have shown that fractional polarisation tends to increase near the jet edge (e.g. Roberts et al 2013, Lloyd & Jones 2002, i.e. the opposite of what we see here.…”

Section: Bright Knots: Internal Jet Structure?contrasting

confidence: 62%

Collimation of the kiloparsec-scale radio jets in NGC 2663

Velovic¹,

Filipović²,

Barnes³

et al. 2022

Preprint

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We present the discovery of highly-collimated radio jets spanning a total of 355 kpc around the nearby elliptical galaxy NGC 2663, and the possible first detection of recollimation on kiloparsec scales. The small distance to the galaxy (∼28.5 Mpc) allows us to resolve portions of the jets to examine their structure. We combine multiwavelength data: radio observations by the Murchison Widefield Array (MWA), the Australian Square Kilometre Array Pathfinder (ASKAP) and the Australia Telescope Compact Array (ATCA), and Xray data from Chandra, Swift and SRG/eROSITA. We present intensity, rotation measure, polarisation, spectral index and X-ray environment maps. Regions of the southern jet show simultaneous narrowing and brightening, which can be interpreted as a signature of the recollimation of the jet by external, environmental pressure, though it is also consistent with an intermittent Active Galactic Nuclei (AGN) or complex internal jet structure. X-ray data suggest that the environment is extremely poor; if the jet is indeed recollimating, the large recollimation scale (40 kpc) is consistent with a slow jet in a low-density environment.

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“…GKW00 made a search through the literature and classified six sources as HYMORS. Four out of six objects from their sample have higher resolution VLBI observations, and they possess core-jet structures with the jet pointing towards the FR I side (Pérez-Torres et al 2004;Beasley et al 2002;Giroletti et al 2004) or two-sided jets (Lloyd & Jones 2002). Two of the objects have been classified as BL Lacs with small viewing angles (Wu et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Orientation of the cores of hybrid morphology radio sources

Ceglowski

Gawroński

Kunert-Bajraszewska

2013

A&A

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Aims. The FR I/FR II dichotomy is a much debated issue in the astrophysics of extragalactic radio sources. Study of the properties of HYbrid MOrphology Radio Sources (HYMORS) may bring crucial information and lead to a step forward in understanding the origin of FR I/FR II dichotomy. HYMORS are a rare class of double-lobed radio sources where each of the two lobes clearly exhibits a different FR morphology. This article describes follow-up high resolution VLBA observations of the five discovered by us HYMORS. The main aim of the observations was to answer the questions of whether the unusual radio morphology is connected to the orientation of objects towards the observer. Methods. The milliarcsecond-scale structures are good probes of the galactic medium, the possible asymmetries, and orientation of the central engines of the sources. We obtained the high resolution radio maps of five hybrid radio morphology objects with the VLBA at C-band and L-band. Results. The cores of all five sources have been detected at both radio bands. Two of them revealed milliarcsecond core-jet structures, the next two objects showed hints of parsec-scale jets, and the last one remained point-like at both frequencies. Conclusions. We compared properties of observed milliarcsecond structures of hybrid sources with the larger scale ones previously detected with the VLA. We find that on both scales the fluxes of their central components are similar, which may indicate the lack of additional emission in the proximity of the nucleus. This suggests that jets present on the ∼1−10 kpc scale in those objects are FR II-like. When possible, the detected core-jet structures were used for estimating the core's spatial orientation. The result is that neither the FR I-like nor the FR II-like side is preferred, which may suggest that no specific spatial orientation of HYMORS is required to explain their radio morphology. Their estimated viewing angles indicate they are unbeamed objects. The 178/151 MHz luminosity of observed HYMORS exceed the traditional FR I/FR II break luminosity, indicating they have radio powers similar to FR IIs.

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Jets in the Fanaroff-Riley class I radio galaxies PKS B1234−723, MRC 1452−517 and PKS B2148−555

Cited by 10 publications

References 34 publications

A Swift X-Ray View of the SMS4 Sample—X-Ray Properties of 31 Quasars and Radio Galaxies

A Swift X-Ray View of the SMS4 Sample—X-Ray Properties of 31 Quasars and Radio Galaxies

Collimation of the kiloparsec-scale radio jets in NGC 2663

Orientation of the cores of hybrid morphology radio sources

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