Megaparsec-scale Radio Structure Associated with a Hybrid Blazar SBS B1646+499: Episodic Jet Activity with Precessing Axis

Pajdosz-Śmierciak, Urszula; Jamrozy, M.; Soida, M.; Stawarz, Ł.

doi:10.3847/1538-4357/aae1a9

Cited by 5 publications

(2 citation statements)

References 88 publications

(93 reference statements)

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“…Furthermore, the lobe axis would be largely misaligned (by ∼90 • ) with respect to the tail. Such misalignment could hint at precession of the jet axis (e.g., [55]). Among the mechanisms that may lead to a reorientation of the radio jets, the presence of a binary supermassive black hole has been proposed as a possible driver of jet misalignment in some double-double radio galaxies (e.g., [56]) and of jet reorientation in X-shaped radio sources ( [57]).…”

Section: A Diffuse Radio Tail Hinting At Jet Precession?mentioning

confidence: 99%

Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948

et al. 2021

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We present VLA Low-band Ionosphere and Transient Experiment (VLITE) 338 MHz observations of the galaxy cluster CL 0838+1948. We combine the VLITE data with Giant Metrewave Radio Telescope 610 MHz observations and survey data. The central galaxy hosts a 250 kpc source whose emission is dominated by two large lobes at low frequencies. At higher frequencies, a pair of smaller lobes (∼30 kpc) is detected within the galaxy optical envelope. The observed morphology is consistent with a restarted radio galaxy. The outer lobes have a spectral index αout=1.6, indicating that they are old, whereas the inner lobes have αinn=0.6, typical for an active source. Spectral modeling confirms that the outer emission is a dying source whose nuclear activity switched off not more than 110 Myr ago. Using archival Chandra X-ray data, we compare the radio and hot gas emission. We find that the active radio source is contained within the innermost and X-ray brightest region, possibly a galactic corona. Alternatively, it could be the remnant of a larger cool core whose outer layers have been heated by the former epoch of activity that has generated the outer lobes.

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Section: A Diffuse Radio Tail Hinting At Jet Precession?mentioning

confidence: 99%

Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948

et al. 2021

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“…Another exceptional case of restarting activity is the giant radio galaxy J2333−2343 (Hernandez-Garcia et al 2017) where the direction of the jet has changed in the new episode of nuclear activity; it points almost towards us now which makes this source a radio galaxy with a blazar host. J1647+4950 (SBS B1646+499; Pajdosz-Śmierciak et al 2018) with large-scale diffuse lobes is also hosted by a blazar. Surprisingly, a relatively small number of DDRSs were thoroughly studied.…”

Section: Introductionmentioning

confidence: 99%

Multifrequency study of a double-double radio galaxy J0028+0035

Marecki,

Jamrozy,

Machalski

et al. 2020

Preprint

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We report the discovery of a double-double radio source (DDRS) J0028+0035. We observed it with LOFAR, GMRT, and the VLA. By combining our observational data with those from the literature, we gathered an appreciable set of radio flux density measurements covering the range from 74 MHz to 14 GHz. This enabled us to carry out an extensive review of physical properties of the source and its dynamical evolution analysis. In particular, we found that, while the age of the large-scale outer lobes is about 245 Myr, the renewal of the jet activity, which is directly responsible for the double-double structure, took place only about 3.6 Myr ago after about 11 Myr long period of quiescence. Another important property typical for DDRSs and also present here is that the injection spectral indices for the inner and the outer pair of lobes are similar. The jet powers in J0028+0035 are similar too. Both these circumstances support our inference that it is, in fact, a DDRS which was not recognized as such so far because of the presence of a coincident compact object close to the inner double so that the centre of J0028+0035 is apparently a triple.

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Multifrequency study of a double–double radio galaxy J0028+0035

Marecki

Jamrozy

Machalski

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We report discovery of a double–double radio source (DDRS) J0028+0035. We observed it with LOFAR, GMRT, and the VLA. By combining our observational data with those from the literature, we gathered an appreciable set of radio flux density measurements covering the range from 74 MHz to 14 GHz. This enabled us to carry out an extensive review of physical properties of the source and its dynamical evolution analysis. In particular, we found that, while the age of the large-scale outer lobes is about 245 Myr, the renewal of the jet activity, which is directly responsible for the double–double structure, took place only about 3.6 Myr ago after about 11 Myr long period of quiescence. Another important property typical for DDRSs and also present here is that the injection spectral indices for the inner and the outer pair of lobes are similar. The jet powers in J0028+0035 are similar too. Both these circumstances support our inference that it is in fact a DDRS which was not recognized as such so far because of the presence of a coincident compact object close to the inner double so that the centre of J0028+0035 is apparently a triple.

show abstract

Megaparsec-scale Radio Structure Associated with a Hybrid Blazar SBS B1646+499: Episodic Jet Activity with Precessing Axis

Cited by 5 publications

References 88 publications

Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948

Radio and X-ray Observations of the Restarted Radio Galaxy in the Galaxy Cluster CL 0838+1948

Multifrequency study of a double-double radio galaxy J0028+0035

Multifrequency study of a double–double radio galaxy J0028+0035

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