Observations of the radio jets in NGC 5090 (PKS B1318 -- 434)

Lloyd, Ben D.; Jones, P. A.; Haynes, R. F.

doi:10.1093/mnras/279.4.1197

Cited by 10 publications

(8 citation statements)

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“…This is a typical FR type I radio galaxy as can be seen from the radio images presented in Morganti et al (1993) and Lloyd, Jones & Haynes (1996). In Fig.…”

Section: Resultsmentioning

confidence: 57%

H I absorption in radio galaxies: effect of orientation or interstellar medium?

Morganti¹,

Oosterloo²,

Tadhunter

et al. 2001

Monthly Notices of the Royal Astronomical Society

110

168

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A search for H i absorption has been made in 23 radio galaxies selected from a complete sample. The observations were made with the Australia Telescope Compact Array (ATCA), with the Very Large Array (VLA) and for one galaxy with the Westerbork Synthesis Radio Telescope (WSRT). In five galaxies H i absorption was detected. We investigate how the detection rate is distributed among galaxies with different radio and optical properties. Among the Fanaroff–Riley (FR) type I radio galaxies, only one object (10 per cent of the total) was detected in H i absorption. The H i absorption in these objects is likely to come from a nuclear disc, as found for other galaxies of this type (e.g. NGC 4261 and Hydra A). The low detection rate is consistent with the hypothesis (as suggested by optical and X‐ray data) that the ‘standard’ parsec‐scale, geometrically thick torus is not required in low‐luminosity radio galaxies. This is consistent with earlier optical work. In the case of FR type II powerful radio galaxies, no H i absorption has been detected in broad‐line radio galaxies, while three out of four narrow‐line radio galaxies have been detected (the one non‐detection having quite a high upper limit). All of these are compact or small radio galaxies. To first order this is consistent with the predictions of the unified schemes, assuming that the H i absorption is caused by an obscuring torus. However, the indications of this being the only cause of the absorption are not very strong. In particular, we find that in two of the three detected objects the H i is blueshifted compared with the systemic velocity. In the third galaxy (PKS 1549–79) two redshift systems (from the optical lines) are found. The uncertainty in the systemic velocity derived from optical lines is discussed. Finally, by also considering data available in the literature, we find a tendency for radio galaxies with a strong component of young stellar population and far‐infrared emission to show H i absorption. The overall richer interstellar medium that is likely to be present in these galaxies may be a factor in producing the absorption.

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“…This is a typical FR type I radio galaxy as can be seen from the radio images presented in Morganti et al (1993) and Lloyd, Jones & Haynes (1996). In Fig.…”

Section: Resultsmentioning

confidence: 57%

H I absorption in radio galaxies: effect of orientation or interstellar medium?

Morganti¹,

Oosterloo²,

Tadhunter

et al. 2001

Monthly Notices of the Royal Astronomical Society

110

168

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“…2) and 2 arcsec, without the gap often seen between the core and turn‐on of the jets (e.g. PKS B1318−434, Lloyd et al 1996).…”

Section: Atca Observations and Resultsmentioning

confidence: 99%

“…The southern jet has a low spreading rate along most of its length and the northern jet is faint and forms an edge‐brightened lobe. In contrast, PKS B1234−723 and B2148−555 (like PKS B1318−434: Lloyd et al 1996) have a more characteristic FR I structure with prominent jets on both sides with a high spreading rate.…”

Section: Equipartition Parametersmentioning

confidence: 96%

“…This is part of a larger study of FR I jets in southern radio galaxies (Lloyd 1996, 1997) which includes PKS B1318−434 (NGC 5090, Lloyd, Jones & Haynes 1996) and PKS B1343−601 (Centaurus B, Jones, Lloyd & McAdam 2001). These galaxies are all larger than 10 arcmin in angular size and selected from the Molonglo Reference Catalogue (MRC) sample of Jones & McAdam (1992) and McAdam (1991).…”

Section: Introductionmentioning

confidence: 99%

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

Lloyd¹,

Jones²

2002

Monthly Notices of the Royal Astronomical Society

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We present radio observations made with the Australia Telescope Compact Array to study the jets and lobes of three Fanaroff–Riley class I (FR I) radio galaxies: PKS B1234−723, 1452−517 and B2148−555. The total intensity and polarization radio images of the FR I jets are used to determine jet brightness and width variations, magnetic field structure and fractional polarization. The equipartition pressure is determined as a function of distance from the galaxies to probe the intergalactic medium.

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“…Many FR I or ‘weak‐flavour’ jets (e.g. PKS B1318−434, Lloyd et al 1996) propagate in the power law pressure gradient, without reaching the constant pressure region. In Centaurus B the pressure stays at ∼10 −13 h −4/7 Pa because the jets are not propagating in the intergalactic medium, but in the diffuse backflow lobes.…”

Section: Discussionmentioning

confidence: 99%

The radio galaxy Centaurus B

Jones

Lloyd

McAdam

2001

Monthly Notices of the Royal Astronomical Society

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Centaurus B (PKS B1343−601) is one of the brightest and closest radio galaxies, with flux density ∼250 Jy at 408 MHz and redshift 0.01215, but it has not been studied much because of its position (i) close to the Galactic plane (it is also known as G309.6+1.7 and Kes 19) and (ii) in the southern sky. It has recently been suggested as the centre of a highly obscured cluster behind the Galactic plane. We present radio observations made with the Australia Telescope Compact Array and Molonglo Observatory Synthesis Telescope to study the jets and lobes. The total intensity and polarization radio images of the FR I jets are used to determine the jet brightness and width variations, magnetic field structure and fractional polarization. The equipartition pressure calculated along the jets declines rapidly over the first 1 arcmin from the galaxy reaching a constant pressure of 10−13 h−4/7 Pa in the lobes blown in the intracluster medium.

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Observations of the radio jets in NGC 5090 (PKS B1318 -- 434)

Cited by 10 publications

References 0 publications

H I absorption in radio galaxies: effect of orientation or interstellar medium?

H I absorption in radio galaxies: effect of orientation or interstellar medium?

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

The radio galaxy Centaurus B

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