Helical jets and the misalignment distribution for core-dominated radio sources

Conway, J. E.; Murphy, D. W.

doi:10.1086/172809

Cited by 99 publications

(112 citation statements)

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“…Using R > 27, βapp = 1.1, jet structural parameter p = 3 (for a continuous jet), and the relations listed in the Appendix of Urry & Padovani (1995), we derive an upper limit of θj 48 degrees. This result is consistent with the inclination estimated by Tingay et al (2000), who derived the jet inclination in a different manner, using the jet deflection model for a bent jet following Conway & Murphy (1993), finding an upper limit of θj < 51 • . Another estimate by Wilson et al (2001), incorporating projection relations from the radio maps of Perley et al (1997) …”

Section: Inclination Of the Radio Jetsupporting

confidence: 91%

Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A

Couto

Storchi‐Bergmann

Robinson

et al. 2016

Mon. Not. R. Astron. Soc.

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We present optical integral field spectroscopy of the inner 2.5 × 3.4 kpc 2 of the broadline radio galaxy Pictor A, at a spatial resolution of ≈ 400 pc. Line emission is observed over the whole field-of-view, being strongest at the nucleus and in an elongated linear feature (ELF) crossing the nucleus from the south-west to the north-east along PA ≈ 70 • . Although the broad double-peaked Hα line and the [O i]6300/Hα and [S ii]6717+31/Hα ratios are typical of AGNs, the [N ii]6584/Hα ratio (0.15 − 0.25) is unusually low. We suggest that this is due to the unusually low metallicity of the gas. Centroid velocity maps show mostly blueshifts to the south and redshifts to the north of the nucleus, but the velocity field is not well fitted by a rotation model. Velocity dispersions are low (< 100 km s −1 ) along the ELF, ruling out a jet-cloud interaction as the origin of this structure. The ELF shows both blueshifts and redshifts in channel maps, suggesting that it is close to the plane of the sky. The ELF is evidently photoionized by the AGN, but its kinematics and inferred low metallicity suggest that this structure may have originated in a past merger event with another galaxy. We suggest that the gas acquired in this interaction may be feeding the ELF.

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Section: Inclination Of the Radio Jetsupporting

confidence: 91%

Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A

Couto

Storchi‐Bergmann

Robinson

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Small intrinsic changes can therefore appear as large-angle misalignments between the jet axes observed on parsec and kiloparsec scales. Indeed, large-angle misalignments have been observed in some core-dominated radio sources (e.g., 3C 309.1; Wilkinson et al 1986), and the distribution of jet misalignment angles has been extensively studied (e.g., Pearson & Readhead 1988;Wehrle et al 1992;Conway & Murphy 1993;Appl, Sol, & Vicente 1996). While the distribution is known to have a bimodal shape, with a main peak of misalignment angles near 0 and a secondary peak near 90 (Pearson & Readhead 1988;Conway & Murphy 1993), misalignment angles larger than 120 are quite rare.…”

Section: Introductionmentioning

confidence: 99%

PKS 1510−089: A Head‐on View of a Relativistic Jet

Homan¹,

Wardle²,

Cheung³

et al. 2002

ApJ

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The gamma-ray blazar PKS 1510À089 has a highly superluminal milliarcsecond jet at a position angle (P.A.) of À28 and an arcsecond jet with an initial P.A. of 155 . With a DP.A. of 177 between the arcsecond and milliarcsecond jets, PKS 1510À089 is perhaps the most highly misaligned radio jet ever observed and serves as a graphic example of projection effects in a highly beamed relativistic jet. Here we present the results of observations designed to bridge the gap between the milliarcsecond and arcsecond scales. We find that a previously detected '' counterfeature '' to the arcsecond jet is directly fed by the milliarcsecond jet. This feature is located 0>3 from the core, corresponding to a deprojected distance of 30 kpc. The feature appears to be dominated by shocked emission and has an almost perfectly ordered magnetic field along its outside edge. We conclude that it is most likely a shocked bend, viewed end-on, where the jet crosses our line of sight to form the southern arcsecond jet. While the bend appears to be nearly 180 when viewed in projection, we estimate the intrinsic bending angle to be between 12 and 24 . The cause of the bend is uncertain; however, we favor a scenario where the jet is bent after it departs the galaxy, either by ram pressure due to winds in the intracluster medium or simply by the density gradient in the transition to the intergalactic medium.

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“…The cores are identified based on compactness, flat radio spectra, and strong flux density variability. Stronger misalignment between the parsec-scale and the kiloparsec-scale jets have been found for BL Lac objects compared to quasars (Conway & Murphy, 1993). No clear counter-jets have been found in core-dominated, i.e., presumably strongly boosted sources, but counter-jets are seen in some lobe-dominated objects, e.g., Cygnus A and 3C 84.…”

Section: Imaging Of Luminous Objectsmentioning

confidence: 90%

Parsec-Scale Structure of Compact Radio Sources

Zensus

1996

Symp. - Int. Astron. Union

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Abstract. High-dynamic range imaging and monitoring with Very Long Baseline Interferometry have considerably increased our knowledge of the parsec-scale properties of compact radio sources. I review some of the properties of individual sources in areas where particular progress has been made in the last few years. Imaging of Luminous ObjectsThe study of prominent flat-spectrum sources with Very Long Baseline Interferometry (VLBI) provides arguably the best opportunity for testing physical models of parsec-scale radio jets. Routine high-quality observations are possible with the Very Long Baseline Array (VLBA), the global VLBI campaigns with various other networks, and the "World Array" campaigns. At millimeter wavelengths, ad hoc arrays have been used to make images with highest resolution, albeit modest overall fidelity. Space VLBI missions in preparation bear the potential of imaging at yet higher resolution.For a review of the various VLBI surveys and for morphological classifications see Wilkinson (1995), and Vermeiden (these Proceedings) for a statistical analysis of superluminal motions. Here, I will focus on several recent results from various ongoing studies of individual objects. I will then review some of the results from detailed VLBI monitoring studies of specific sources.The high-luminosity VLBI sources typically have well collimated corejet structure at centimeter and millimeter wavelengths. The cores are identified based on compactness, flat radio spectra, and strong flux density variability. Stronger misalignment between the parsec-scale and the kiloparsec-

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Helical jets and the misalignment distribution for core-dominated radio sources

Cited by 99 publications

References 0 publications

Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A

Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A

PKS 1510−089: A Head‐on View of a Relativistic Jet

Parsec-Scale Structure of Compact Radio Sources

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