A Study of the Decimetric Emission and Polarization of Centaurus A

Cooper, Barry; Price, R. M.; Cole, D. J. A.

doi:10.1071/ph650589

Cited by 71 publications

(61 citation statements)

References 14 publications

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“…PKS B1318À434: Complex double source, with bent edgedarkened lobes, lying behind the southern lobe of Centaurus A (Cooper et al 1965;Haynes et al 1983).…”

Section: Comments On Individual Sourcesmentioning

confidence: 99%

The Molonglo Southern 4 Jy Sample (MS4). I. Definition

Burgess

Hunstead

2006

Astron J

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We have defined a complete sample of 228 southern radio sources at 408 MHz with integrated flux densities S 408 > 4:0 Jy, Galactic latitude jbj > 10 , and declination À85 < < À30 . The main finding survey used was the Molonglo Reference Catalogue. We describe in detail how the Molonglo Southern 4 Jy sample (MS4) was assembled and its completeness assessed. Sources in the sample were imaged at 843 MHz with the Molonglo Observatory Synthesis Telescope to obtain positions accurate to about 1 00 , as well as flux densities and angular sizes; follow-up radio and optical observations are presented in Paper II. Radio spectra for the MS4 have been compiled from the literature and used to estimate flux densities at 178 MHz. The strong-source subset of MS4, with S 178 > 10:9 Jy (SMS4), provides a southern sample closely equivalent to the well-studied northern 3CRR sample. Comparison of SMS4 with 3CRR shows a reassuring similarity in source density and median flux density between the two samples.

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“…PKS B1318À434: Complex double source, with bent edgedarkened lobes, lying behind the southern lobe of Centaurus A (Cooper et al 1965;Haynes et al 1983).…”

Section: Comments On Individual Sourcesmentioning

confidence: 99%

The Molonglo Southern 4 Jy Sample (MS4). I. Definition

Burgess

Hunstead

2006

Astron J

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“…Vast regions of fainter emission extend beyond the inner lobes. In projection, the outer lobes comprise the largest object on the sky, extending across 10¡ (Cooper, Price, & Cole 1965). Morganti et al (1999) studied the radio emission emanating from the northern middle lobe and its immediate surroundings.…”

Section: Previous Observationsmentioning

confidence: 99%

The Centaurus A Northern Middle Lobe as a Buoyant Bubble

Saxton

Sutherland

Bicknell

2001

ApJ

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We model the northern middle radio lobe of Centaurus A (NGC 5128) as a buoyant bubble of plasma deposited by an intermittently active jet. The extent of the rise of the bubble and its morphology imply that the ratio of its density to that of the surrounding ISM is less than 10~2, consistent with our knowledge of extragalactic jets and minimal entrainment into the precursor radio lobe. Using the morphology of the lobe to date the beginning of its rise through the atmosphere of Cen A, we conclude that the bubble has been rising for approximately 140 Myr. This timescale is consistent with that proposed by Quillen and coworkers for the settling of postmerger gas into the presently observed large-scale disk in NGC 5128, suggesting a strong connection between the delayed reestablishment of radio emission and the merger of NGC 5128 with a small gas-rich galaxy. This suggests a connection, for radio galaxies in general, between mergers and the delayed onset of radio emission. In our model, the elongated X-ray emission region discovered by Feigelson and coworkers, part of which coincides with the northern middle lobe, is thermal gas that originates from the interstellar medium below the bubble and that has been uplifted and compressed. The "" large-scale jet ÏÏ appearing in the radio images of Morganti and coworkers may be the result of the same pressure gradients that cause the uplift of the thermal gas, acting on much lighter plasma, or may represent a jet that did not turn o † completely when the northern middle lobe started to buoyantly rise. We propose that the adjacent emission-line knots (the "" outer Ðlaments ÏÏ) and star-forming regions result from the disturbance, in particular the thermal trunk, caused by the bubble moving through the extended atmosphere of NGC 5128.

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“…Its popularity is not only due to its brightness, but also to its many unusual features: (i) there is a prominent dust band containing young stars and Hii regions (Unger et al 2000;Wild & Eckart 2000;Graham 1979); (ii) there is an active nucleus with a radio and X-ray jet, radio lobes and optical filaments (Cooper et al 1965;Feigelson et al 1981;Kraft et al 2000;Schreier et al 1981;Clarke et al 1992;Blanco et al 1975;Dufour & van den Bergh 1978); (iii) Malin et al (1983) discovered a large number of faint narrow shells of stars surrounding the galaxy; (iv) Schiminovich et al (1994) detected 4 × 10 8 M of Hi gas associated with the stellar shells, but slightly displaced outside the shells; and (v) most recently, molecular CO gas has been found associated with the Hi gas and the stellar shells (Charmandaris et al 2000). All of these are clear indications of a recent interaction with a gas-rich galaxy.…”

Section: Introductionmentioning

confidence: 99%

Stellar populations in NGC 5128 with the VLT: Evidence for recent star formation

Rejkuba

Minniti²,

Silva

et al. 2001

A&A

107

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Abstract. We resolve stars of the nearest giant elliptical galaxy NGC 5128 using VLT with FORS1 and ISAAC. We construct deep U , V and Ks color-magnitude and color-color diagrams in two different halo fields (in the halo and in the north-eastern diffuse shell). In the outer, shell field, at ∼14 kpc from the center of the galaxy, there is a significant recent star formation with stars as young as 10 Myr, approximately aligned with the prominent radio and X-ray jet from the nucleus of the host AGN. Ionized gas filaments are evident in ultraviolet images near the area where neutral Hi and CO molecular gas was previously observed. The underlying stellar population of the halo of the giant elliptical is predominantly old with a very broad metallicity distribution. The presence of an extended giant branch reaching M bol = −5 mag suggests the existence of a significant intermediate-age AGB population in the halo of this galaxy.

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A Study of the Decimetric Emission and Polarization of Centaurus A

Cited by 71 publications

References 14 publications

The Molonglo Southern 4 Jy Sample (MS4). I. Definition

The Molonglo Southern 4 Jy Sample (MS4). I. Definition

The Centaurus A Northern Middle Lobe as a Buoyant Bubble

Stellar populations in NGC 5128 with the VLT: Evidence for recent star formation

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