A two-sided jet structure in the 'steep-spectrum core' of 3C293

Akujor, C. E.; Leahy, J. P.; Garrington, S. T.; Sanghera, H. S.; Spencer, R. E.; Schilizzi, R. T.

doi:10.1093/mnras/278.1.1

Cited by 35 publications

(93 citation statements)

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“…Although the WSRT observations cannot resolve the complex nuclear structure of 3C 293 (see above) and therefore exactly locate where the broad H i is occurring, we know that some interaction between the radio plasma and the ISM is taking place. Evidence was found that the broadest optical lines are seen in coincidence with the region of the most intense radio emission, which is a radio hot spot about 1.4 kpc east of the core, as determined by VLBI observations (Akujor et al 1996). New optical spectra (B. H. C. Emonts et al 2003, in preparation) show that in this location, the optical emission lines contain a broad component that is very similar to the broad H i absorption (see Fig.…”

Section: The Origin Of the Broad H I Absorptionmentioning

confidence: 66%

Fast Outflow of Neutral Hydrogen in the Radio Galaxy 3C 293

Morganti¹,

Oosterloo²,

Emonts³

et al. 2003

ApJ

101

120

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We report the detection of very broad H i absorption against the central regions of the radio galaxy 3C 293. The absorption profile, obtained with the Westerbork Synthesis Radio Telescope, has a full width at zero intensity of about 1400 km s Ϫ1, and most of this broad absorption (∼1000 km s Ϫ1) is blueshifted relative to the systemic velocity. This absorption represents a fast outflow of neutral gas from the central regions of this active galactic nucleus. Possible causes for such an outflow are discussed. We favor the idea that the interaction between the radio jet and the rich interstellar medium produces this outflow. Some of the implications of this scenario are considerebd.

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Section: The Origin Of the Broad H I Absorptionmentioning

confidence: 66%

Fast Outflow of Neutral Hydrogen in the Radio Galaxy 3C 293

Morganti¹,

Oosterloo²,

Emonts³

et al. 2003

ApJ

101

120

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“…Estimations based on spectral aging show that the large radio source was triggered 20 Myr ago and stopped ∼0.35 Myr ago, while the compact source was triggered 0.18 Myr ago (Akujor et al 1996;Joshi et al 2011). The time-lapse between the two activity epochs probably lasted only 0.1 Myr (Joshi et al 2011).…”

Section: C 293mentioning

confidence: 97%

Fueling the central engine of radio galaxies

Labiano

García‐Burillo

Combes

et al. 2014

A&A

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Context. Powerful radio galaxies show evidence of ongoing active galactic nuclei (AGN) feedback, mainly in the form of fast, massive outflows. But it is not clear how these outflows affect the star formation of their hosts. Aims. We investigate the different manifestations of AGN feedback in the evolved, powerful radio source 3C 293 and their impact on the molecular gas of its host galaxy, which harbors young star-forming regions and fast outflows of H i and ionized gas.Methods. We study the distribution and kinematics of the molecular gas of 3C 293 using high spatial resolution observations of the 12 CO(1−0) and 12 CO(2−1) lines, and the 3 mm and 1 continuum taken with the IRAM Plateau de Bure interferometer. We mapped the molecular gas of 3C 293 and compared it with the dust and star-formation images of the host. We searched for signatures of outflow motions in the CO kinematics, and re-examined the evidence of outflowing gas in the H i spectra. We also derived the star formation rate (SFR) and star formation efficiency (SFE) of the host with all available SFR tracers from the literature, and compared them with the SFE of young and evolved radio galaxies and normal star-forming galaxies. Results. The 12 CO(1−0) emission line shows that the molecular gas in 3C 293 is distributed along a massive (M(H 2 ) ∼ 2.2 × 10 10 M ) ∼24 (21 kpc-) diameter warped disk, that rotates around the AGN. Our data show that the dust and the star formation are clearly associated with the CO disk. The 12 CO(2−1) emission is located in the inner 7 kpc (diameter) region around the AGN, coincident with the inner part of the 12 CO(1−0) disk. Both the 12 CO(1−0) and 12 CO(2−1) spectra reveal the presence of an absorber against the central regions of 3C 293 that is associated with the disk. We do not detect any fast ( 500 km s −1 ) outflow motions in the cold molecular gas. The host of 3C 293 shows an SFE consistent with the Kennicutt-Schmidt law of normal galaxies and young radio galaxies, and it is 10-50 times higher than the SFE estimated with the 7.7 μm PAH emission of evolved radio galaxies. Our results suggest that the apparently low SFE of evolved radio galaxies may be caused by an underestimation of the SFR and/or an overestimation of the molecular gas densities in these sources. Conclusions. The molecular gas of 3C 293, while not incompatible with a mild AGN-triggered flow, does not reach the high velocities ( 500 km s −1 ) observed in the H i spectrum. We find no signatures of AGN feedback in the molecular gas of 3C 293.

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“…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%

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 two-sided jet structure in the 'steep-spectrum core' of 3C293

Cited by 35 publications

References 0 publications

Fast Outflow of Neutral Hydrogen in the Radio Galaxy 3C 293

Fast Outflow of Neutral Hydrogen in the Radio Galaxy 3C 293

Fueling the central engine of 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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