A radio study of neutral gas and dust in the radio galaxy 3C 293

Beswick, R.; Pedlar, A.; Holloway, A. J.

doi:10.1046/j.1365-8711.2002.05024.x

Cited by 36 publications

(91 citation statements)

References 23 publications

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“…In this galaxy, very broad H I absorption has been detected against the central regions -this is in addition to the known and much narrower absorption; Haschick & Baan 1985, Beswick et al 2002 Left: a zoom-in of the [0111] and Ha+ [NII] lines in the Seyfert IC 5063. The radio image on a similar scale is also shown.…”

Section: Outflows Of Neutral Hydrogenmentioning

confidence: 83%

Gas Outflows in Radio Galaxies

Morganti¹,

Oosterloo²,

Emonts³

et al. 2004

Symp. - Int. Astron. Union

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Abstract.We present a summary of our recent results on gas outflows in radio galaxies. Fast outflows (up to 2000 km S-l) have been detected both in ionized and neutral gas. The latter is particularly surprising as it shows that, despite the extremely energetic phenomena occurring near an AGN, some of the outflowing gas remains, or becomes again, neutral. These results are giving new and important insights on the physical conditions of the gaseous medium around an AGN.

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Section: Outflows Of Neutral Hydrogenmentioning

confidence: 83%

Gas Outflows in Radio Galaxies

Morganti¹,

Oosterloo²,

Emonts³

et al. 2004

Symp. - Int. Astron. Union

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“…Since our observations, four sources have been studied with other telescopes. NGC 315 is presented in Morganti et al (2009); 3C 293 was observed at high resolution by Beswick et al (2002); and NGC 5141 and NGC 7052 were observed at lower resolution in Emonts et al (2010). Only NGC 7052 was not detected, and a stringent upper-limit was set.…”

Section: Vla Observationsmentioning

confidence: 97%

A relation between circumnuclear H I, dust, and optical cores in low-power radio galaxies

Bemmel

Morganti

Oosterloo

et al. 2012

A&A

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From new observations and literature data we investigate the presence of H i, dust, and optical cores in the central kiloparsec of low-power radio galaxies. The goal of this pilot study is to identify physical relations between these components, which can help us to study kinematics and feeding mechanisms in future samples of active galaxies. Our results are consistent with neutral gas being associated with dust on sub-kiloparsec scales. Objects that have H i absorption always have significant amounts of dust in their host galaxy. If there is no visible dust in the host galaxy, there is also no H i absorption. The presence of an unresolved optical core correlates with the H i column density, with the core being absent in high-column density sources. This work opens a path for studying the kinematics of cold material in the central regions of active galaxies by combining information of H i absorption and molecular lines. Consistent with previous work, we find no evidence for a compact, parsec-scale obscuring torus in low-power radio galaxies.

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“…These images (except Fig. 3(d), which is reproduced directly from Beswick, Pedlar & Holloway (2002)), are obtained reducing the archival VLA data in a standard manner using the AIPS package. Figure 2 shows the 1.36 GHz VLA B-array (project code GP022) image of the outer lobes (this map is similar to that shown by Beswick et al 2004 in their Fig.…”

Section: Radio Maps and Datamentioning

confidence: 99%

“…In particular, Lanz et al extracted the spectrum of the nuclear region in the circular 3. 5 aperture (radius of ∼ 3 kpc) centred at the radio core precisely determined with the MERLIN/VLA/VLBI observations (Beswick, Pedlar & Holloway 2002;Beswick et al 2004) and discovered that it could be fitted with a model consisting of a thermal component with a temperature of 1.03 ± 0.10 keV, and two power-law components: one absorbed (N H = 9.4 × 10 22 cm −2 ) with the photon index of 1.32 ± 0.36, and the other one unabsorbed with the photon index of 0.57 ± 0.87. The authors associated the absorbed power-law component with the active nucleus, while the unabsorbed power law and the thermal components with an off-nuclear source and a diffuse emission around the nuclear region, respectively.…”

Section: Hot Gaseous Environmentmentioning

confidence: 99%

“…More recently, this core region was resolved with the MERLIN array (Akujor et al 1996;Beswick, Pedlar & Holloway 2002), which revealed a compact (∼ 2 arcsec) pair of symmetric and steep-spectrum lobes supplied by small-scale jets, and extending in an east-west direction, with adjacent less luminous tail-like feature bending out of the galactic disk. The angular size of this feature is about 4 arcsec, i.e., about 4 kpc in projection.…”

Section: Introductionmentioning

confidence: 99%

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Dynamical analysis of the complex radio structure in 3C 293: clues on a rapid jet realignment in X-shaped radio galaxies

Machalski

Jamrozy

Stawarz

et al. 2016

A&A

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Context. Radio galaxies classified as X-shaped/winged, are characterised by two pairs of extended and misaligned lobes, which suggest a rapid realignment of the jet axis, for which a potential cause (including binary supermassive black holes, a black hole merger, or a Lense-Thirring precession) is still under debate. Aims. Here we analyse the complex radio structure of 3C 293 winged source hosted by the post-merger galaxy UGC 8782, which uniquely displays a significant asymmetry between the sizes (and therefore the ages) of the two pairs of lobes, indicating that an episode of jet realignment took place only very recently. This allows us to tightly constrain the corresponding timescales, and therefore to discriminate between different models proposed for the formation of X-shaped radio galaxies in general.Methods. Based on all the available and carefully re-analysed radio data for 3C 293, we have performed a detailed spectral modelling for the older and younger lobes in the system, using the existing evolutionary DYNAGE algorithm. In this way we derived the lobes' ages and jet energetics, which we then compared to the accretion power in the source. Results. We found that the 200 kpc-scale outer lobes of 3C 293 are ∼ 60 Myr old and, until very recently, have been supplied with fresh electrons and magnetic field by the jets, i.e., jet activity related to the formation of the outer lobes ceased within the last Myr. Meanwhile, the inner 4 kpc-scale lobes, tilted by ∼ 40• with respect to the outer ones, are only about ∼ 0.3 Myr old. Interestingly, the best model fits also return identical values of the jet power supplying the outer and the inner structures. This power, moreover, is of the order of the maximum kinetic luminosity of a Blandford-Znajek jet for a given black hole mass and accretion rate, but only in the case of relatively low values of a black hole spin, a ∼ 0.2. Conclusions. The derived jet energetics and timescales, along with the presence of two optical nuclei in UGC 8782, all provide a strong support to the Lense-Thirring precession model in which the supermassive black hole spin, and therefore the jet axis, flips rapidly owing to the interactions with the tilted accretion disk in a new tidal interaction episode of the merging process. We further speculate that, in general, X-shape radio morphology forms in post-merger systems that are rich in cold molecular gas, and only host slowly spinning supermassive black holes.

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A radio study of neutral gas and dust in the radio galaxy 3C 293

Cited by 36 publications

References 23 publications

Gas Outflows in Radio Galaxies

Gas Outflows in Radio Galaxies

A relation between circumnuclear H I, dust, and optical cores in low-power radio galaxies

Dynamical analysis of the complex radio structure in 3C 293: clues on a rapid jet realignment in X-shaped radio galaxies

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