A Giant Radio Jet Ejected by an Ultramassive Black Hole in a Single-lobed Radio Galaxy

Gopal-Krishna, . .; Krause, M.; Joshi, Santosh

doi:10.1086/524220

Cited by 19 publications

(13 citation statements)

References 26 publications

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“…Consequently, the total intensity measurement could include any other total intensity emission along the line of sight that is outside of the radio lobe itself, thus increasing S I in comparison to S P 10 . As a comparison, in distant EGRLs, values are only a few percent at this frequency (Tucci & Toffolatti 2012, and references therein), possibly because of poorer linear resolution for the more distant sources (but see also Bagchi et al (2007)). However, higher percentages have been seen in other nearby spiral galaxies, for example the similar galaxy, NGC 4388 (Damas-Segovia et al 2016).…”

Section: Interaction With the Ism And Physical Parametersmentioning

confidence: 99%

CHANG-ES – VIII. Uncovering hidden AGN activity in radio polarization

Irwin¹,

Schmidt²,

Damas-Segovia³

et al. 2016

Mon. Not. R. Astron. Soc.

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We report on C-band (5 -7 GHz) observations of the galaxy, NGC 2992, from the CHANG-ES sample. This galaxy displays an embedded nuclear double-lobed radio morphology within its spiral disk, as revealed in linearly polarized emission but not in total intensity emission. The radio lobes are kpc-sized, similar to what has been observed in the past for other Seyfert galaxies, and show ordered magnetic fields. NGC 2992 has shown previous evidence for AGN-related activity, but not the linearly polarized radio features that we present here. We draw attention to this galaxy as the first clear example (and prototype) of bipolar radio outflow that is revealed in linearly polarized emission only. Such polarization observations, which are unobscured by dust, provide a new tool for uncovering hidden weak AGN activity which may otherwise be masked by brighter unpolarized emission within which it is embedded. The radio lobes observed in NGC 2992 are interacting with the surrounding interstellar medium and offer new opportunities to investigate the interactions between nuclear outflows and the ISM in nearby galaxies. We also compare the radio emission with a new CHANDRA X-ray image of this galaxy. A new CHANG-ES image of NGC 3079 is also briefly shown as another example as to how much more obvious radio lobes appear in linear polarization as opposed to total intensity.

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Section: Interaction With the Ism And Physical Parametersmentioning

confidence: 99%

CHANG-ES – VIII. Uncovering hidden AGN activity in radio polarization

Irwin¹,

Schmidt²,

Damas-Segovia³

et al. 2016

Mon. Not. R. Astron. Soc.

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“…We conclude at an extremely strong, approaching galactic (pair-plasma) jet propagating through a rather thin circumstellar medium (CSM), so that its channel-wall material (or head) gets boosted to transrelativistic speeds. Another such blue-shifted jet source, CGCG 049-033, has been recently identified by Bagchi et al (2007); its receding lobe is unseen, most likely for causality reasons.…”

Section: Anomalous Redshifts and Jetsmentioning

confidence: 99%

Critical Thoughts on Cosmology

Kundt¹,

Novello²,

Perez³

2009

AIP Conference Proceedings

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Abstract. An overview is given in section 1, of uncertain building blocks of present-day cosmologies. Thereafter, these edited lecture notes deal with the following four special problems: (1) They advertise Wiltshire's result -making 'dark energy' obsolete -that accelerated cosmic expansion may be an artefact, due to an incorrect evaluation of the cosmic timescale in a Universe whose bulk matter is inhomogeneously distributed. (2) They cast doubt on Hawking's prediction of blackhole evaporation. (3) They point at various inconsistencies of the black-hole paradigm, in favour of nuclear-burning central engines of AGN. (4) They re-interpret (a best case of) 'anomalous redshifts' as non-cosmological, kinematic redshifts in strong jet sources.

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“…Despite the huge progress in understanding these objects, unresolved issues still remain; for instance, it is not clear yet why only a small percentage of AGN display jets or how they form. Jets can be extended up to ∼ 100 kpc, thus a fundamental question involves the collimation mechanism over such extended spatial scales, bigger than the typical host galaxy scales (Bagchi et al 2007;Hocuk & Barthel 2010). Jets and outflows injecting material far away from the nucleus may play a crucial role in AGN feedback, the self-regulating mechanism preventing the further growth of Super Massive Black Holes (SMBH).…”

Section: Introductionmentioning

confidence: 99%

A (likely) X-ray jet from NGC6217 observed by XMM–Newton

Falocco

Larsson

Nandi

2017

Monthly Notices of the Royal Astronomical Society

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NGC6217 is a nearby spiral galaxy with a starburst region near its center. Evidence for a low luminosity Active Galactic Nucleus (AGN) in its core has also been found in optical spectra. Intriguingly, X-ray observations by ROSAT revealed three knots aligned with the galaxy center, resembling a jet structure. This paper presents a study of XMM-Newton observations made to assess the hypothesis of a jet emitted from the center of NGC6217. The XMM data confirm the knots found with ROSAT and our spectral analysis shows that they have similar spectral properties with a hard photon index Γ ∼ 1.7. The core of NGC6217 is well fitted by a model with an AGN and a starburst component, where the AGN contributes at most 46% of the total flux. The candidate jet has an apparent length ∼ 15 kpc and a luminosity of ∼ 5 × 10 38 erg s −1 . It stands out by being hosted by a spiral galaxy, since jets are more widely associated with ellipticals. To explain the jet launching mechanism we consider the hypothesis of an advection dominated accretion flow with a low accretion rate. The candidate jet emitted from NGC6217 is intriguing since it represents a challenge to the current knowledge of the connection between AGN, jets and host galaxies.

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A Giant Radio Jet Ejected by an Ultramassive Black Hole in a Single-lobed Radio Galaxy

Cited by 19 publications

References 26 publications

CHANG-ES – VIII. Uncovering hidden AGN activity in radio polarization

CHANG-ES – VIII. Uncovering hidden AGN activity in radio polarization

Critical Thoughts on Cosmology

A (likely) X-ray jet from NGC6217 observed by XMM–Newton

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