B1524-136: A CSS quasar with two-sided radio jets

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Abstract:The role of radio polarimetry in the understanding of GPS and CSS sources is explored. After an initial discussion of what can be learned from polarimetry, the expectations of a simple evolutionary sequence of GPS/CSO to CSS to FR i/FR ii sources are explored. Observational results are then compared with the expectations. Conclusions include: the GPS category is likely not a single homogeneous class of objects; Faraday depth effects are very strong inside the inner 3 kpc of CSS and CSO sources; in at least 3C 138 the Faraday screen has very fine scale (subparsec) structure; and there is evidence for increased ionisation near bends in some CSS jets probably due to jet-ISM interaction. New results on 3C 138, 3C 43, and 3C 454 are given.

“…This could possibly be caused by the jet nearly drilling through the deflecting cloud reducing the Faraday screen. A similar effect has been seen in B1524-136 (Mantovani et al 2002).…”

Section: Observations: Css Sourcessupporting

confidence: 82%

Section: Observations: Css Sourcesmentioning

confidence: 92%

Polarimetry of GPS and CSS Sources

Cotton

Dallacasa

Fanti

et al. 2003

Self Cite

“…Taylor (2000) noted that in coredominated QSOs the highest RMs are to be found in the inner 20 pc of the nuclear region. In both the quasars reported by Mantovani et al (2002) large RMs are also found in the jets at distances of a few 100 pc where the radio-emitting material is interacting with dense gas. In 3C 43, the core is unpolarised and the high RM is also likely to be from the bent jet.…”

Section: Resultsmentioning

confidence: 85%

“…Results for the first two CSS quasars observed in this project, 0548+165 and 1524−136, are available in Mantovani et al (2002). Data analysis of VLBA observations is still in progress for the sources 3C 119, 3C 147, 3C 318, 3C 343, and 4C 24.61.…”

Section: Introductionmentioning

confidence: 99%

The Polarised Bent Jet of 3C 43

Mantovani¹,

Junor²,

Saikia³

et al. 2003

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Radio observations of linear polarisation provide a useful probe of the physical conditions in the gaseous environments of compact steep spectrum (CSS) sources. Here, we present polarimetric VLBA observations at 8.4 GHz of the CSS quasar 3C 43. The jet in this source curves gently up to about 220 mas from the core, at which point it bends sharply, probably due to a jet-cloud encounter. Regions of polarised emission are detected along the jet, while the core component shows no significant polarisation.

“…VLA observations at 5 GHz show B1524−136 to be slightly extended, while at 15 GHz it is resolved into a double source (Mantovani et al 1994). Observations with the VLBA show the northern region to have a very high rotation measure in the range of −3000 to −10000 rad m −2 in the rest frame of the source (Mantovani et al 2002).…”

Section: Introductionmentioning

confidence: 94%

Two-Sided Radio Jets in B1524–136

Mantovani

Bondì

Saikia

et al. 2003

Self Cite

Abstract:We present global VLBI and VLBA observations of the compact steep spectrum quasar B1524−136. These observations reveal well-defined radio jets on both sides of the active nucleus. Also, the overall radio structure appears highly distorted and asymmetric with the counter-jet exhibiting several oscillations. A possible scenario is one in which jet and counter-jet are inclined at about 25 • and 75 • to the line of sight respectively and an environment which is dense on the jet side. Possible implications of these results are discussed.