Breakdown of spatial parallel coding in children's drawing

Bruyn, Bart De; Davis, Alyson

doi:10.1111/j.1467-7687.2005.00411.x

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…J0313+413: the large‐scale structure of this broad line radio galaxy (Marchã et al 1996) was presented by de Bruyn (1989) with rather coarse resolution. Subsequent published observations with the VLA and VLBI have revealed a prominent core and a weak jet‐like extension (Patnaik et al 1992; Henstock et al 1995; Taylor et al 1996; Schoenmakers et al 2000a; Fey & Charlot 2000).…”

Section: Observational Resultsmentioning

confidence: 99%

Radio observations of a few giant sources

Konar

Saikia

Ishwara‐Chandra

et al. 2004

Monthly Notices of the Royal Astronomical Society

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We present multifrequency observations with the Giant Metrewave Radio Telescope (GMRT) and the Very Large Array (VLA) of a sample of seventeen largely giant radio sources (GRSs). These observations have either helped clarify the radio structures or provided new information at a different frequency. The broad line radio galaxy, J0313+413, has an asymmetric, curved radio jet and a variable radio core, consistent with a moderate angle of inclination to the line of sight. We attempt to identify steep spectrum radio cores (SSCs), which may be a sign of recurrent activity, and find four candidates. If confirmed, this would indicate a trend for SSCs to occur preferentially in GRSs. From the structure and integrated spectra of the sources we suggest that the lobes of emission in J0139+399 and J0200+408 may be due to an earlier cycle of nuclear activity. We find that inverse-Compton losses with the cosmic microwave background radiation dominate over synchrotron radiative losses in the lobes of all the sources, consistent with earlier studies. We also show that prominence of the bridge emission decreases with increasing redshift, possibly due to inverse-Compton losses. This could affect the appearance and identification of GRSs at large redshifts.Comment: 11 pages, 2 figures (Figure 1 shows the images of 17 sources), 4 tables. accepted for publication in Monthly Notice

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Section: Observational Resultsmentioning

confidence: 99%

Radio observations of a few giant sources

Konar

Saikia

Ishwara‐Chandra

et al. 2004

Monthly Notices of the Royal Astronomical Society

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“…This source was already studied by Hocuk & Barthel (2010), that estimated a viewing angle of 57 degrees, and a core variability up to 25% in ten years. Another two sources, B3 0309+411B and 4C 74.26, are known to have a variable core flux density from previous works: the first was presented by Saikia et al (1984) andde Bruyn (1989), who show an inverted spectrum up to 100 GHz with a variable core flux density, while the latter was investigated by Riley et al (1989), Pearson et al (1992), and Konar et al (2004), who found a variability of ∼50% at 5 GHz over 14 years.…”

Section: Variabilitymentioning

confidence: 99%

A Discovery of Young Radio Sources in the Cores of Giant Radio Galaxies Selected at Hard X-Rays

Bruni

Panessa

Bassani³

et al. 2019

ApJ

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Giant Radio Galaxies (GRG) are the largest single entities in the Universe, having a projected linear size exceeding 0.7 Mpc, which implies that they are also quite old objects. They are not common, representing a fraction of only ∼6% in samples of bright radio galaxies. While a census of about 300 of these objects has been built in the past years, still no light has been shed on the conditions necessary to allow such an exceptional growth, whether of environmental nature or linked to the inner accretion properties. Recent studies found that samples of radio galaxies selected from hard X-ray AGN catalogs selected from INTEGRAL/IBIS and Swift/BAT (thus at energies >20 keV) present a fraction of GRG four times larger than what found in radio-selected samples.We present radio observations of 15 nuclei of hard X-ray selected GRG, finding for the first time a large fraction (61%) of young radio sources at the center of Mpc-scale structures. Being at the center of GRG, these young nuclei may be undergoing a restarting activity episode, suggesting a link between the detected hard X-ray emission -due to the ongoing accretion -and the reactivation of the jets.

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“…QSO B0241+62 and IGR J13109−5552) are well‐known BLRG [see Table 1 and NASA/IPAC Extragalactic Database (NED); Ballantyne 2005 and Molina et al 2007] and show a morphology with two lobes extending from the central nucleus [see e.g. NRAO/VLA Sky Survey (NVSS) contour maps available in NED]; the extension of the lobes for B3 0309+411 and 4C 74.26 is more than 1 Mpc, hence their classification as giant radio galaxies (Riley et al 1988; de Bruyn 1989). These double‐lobed objects are classified in the literature as FR II galaxies, with the exception of 4C 74.26 and S5 2116+81, which still have an uncertain/unknown nature.…”

Section: The Samplementioning

confidence: 99%

A broad-band spectral analysis of eight radio-loud type 1 active galactic nuclei selected in the hard X-ray band

Molina¹,

Bassani

Malizia

et al. 2008

Monthly Notices of the Royal Astronomical Society

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Starting from a complete sample of type 1 active galactic nuclei (AGN) observed by INTEGRAL in the 20–40 keV band, we have selected a set of eight AGN which can be classified as radio‐loud objects according to their 1.4 GHz power density, radio‐to‐hard X‐ray flux density ratio and radio morphology. The sample contains six broad‐line radio Galaxies and two candidate ones. Most of the objects in our sample display a double‐lobe morphology, both on small and large scales. For all the objects, we present broad‐band (1–110 keV) spectral analysis using INTEGRAL observations together with archival XMM–Newton, Chandra, Swift/XRT and Swift/BAT data. We constrain the primary continuum (photon index and cut‐off energy), intrinsic absorption and reprocessing features (iron line and reflection) in most of the objects. The sources analysed here show remarkable similarities to radio‐quiet type 1 AGN with respect to most of the parameters analysed; we only find marginal evidence for weaker reprocessing features in our objects compared to their radio‐quiet counterparts. Similarly, we do not find any correlation between the spectral parameters studied and the source core dominance or radio to 20–100 keV flux density ratios, suggesting that what makes our objects radio loud has no effect on their high‐energy characteristics.

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Breakdown of spatial parallel coding in children's drawing

Cited by 4 publications

References 15 publications

Radio observations of a few giant sources

Radio observations of a few giant sources

A Discovery of Young Radio Sources in the Cores of Giant Radio Galaxies Selected at Hard X-Rays

A broad-band spectral analysis of eight radio-loud type 1 active galactic nuclei selected in the hard X-ray band

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