Identification of a new low-redshift GHz-peaked spectrum radio source and implications for the GHz-peaked spectrum class

Tingay, S. J.; Edwards, Philip; Tzioumis, A. K.

doi:10.1046/j.1365-2966.2003.07098.x

Cited by 19 publications

(36 citation statements)

References 45 publications

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“…Tingay et al (2003b) identified PKS 2254−367 (D=20.5 Mpc) as one of three low redshift GPS radio galaxies, along with PKS 1718−649 (D=59 Mpc) and NGC 1052 (D=17.2 Mpc). PKS 1718−649 has a so-called classical double morphology.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to the peaked radio spectrum, PKS B2254−367 displays all of the typical characteristics of GPS sources, with compact structure seen on the maximum ATCA 6 km baselines, low fractional polarisation, and low variability over the 3.5 year period of the ATCA monitoring (Tingay, Edwards & Tzioumis 2003b;Edwards & Tingay 2004). In general, GPS objects have marginal variability, representing the variations due to the evolution of a jet originating from a black hole and accretion disk system.…”

Section: Introductionmentioning

confidence: 99%

“…NGC 1052 (z=0.005037) at 17.2 Mpc and PKS 1718−649 (NGC 6328: 0.014428) at 59 Mpc, in the same frame of reference, are the only two other GPS radio sources within 100 Mpc, for which the detailed kinematics of the host galaxies can be studied (see, e.g., Labiano et al 2007). All three galaxies present strong evidence for merger activity, an actively fuelled black hole, and high density environments with which the radio sources interact (Tingay et al 2003b).…”

Section: Introductionmentioning

confidence: 99%

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The multifrequency parsec-scale structure of PKS 2254−367 (IC 1459): a luminosity-dependent break in morphology for the precursors of radio galaxies?

Tingay¹,

Edwards²

2015

Monthly Notices of the Royal Astronomical Society

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We present the first multi-frequency VLBI images of PKS 2254−367, a Gigahertz-Peaked Spectrum (GPS) radio source hosted by the nearby galaxy IC 1459 (D=20.5 Mpc). PKS 2254−367 and the radio source in NGC 1052 (PKS 0238−084; D=17.2 Mpc) are the two closest GPS radio sources to us, far closer than the next closest example, PKS 1718−649 (D = 59 Mpc). As such, IC 1459 and NGC 1052 offer opportunities to study the details of the pc-scale radio sources as well as the environments that the radio sources inhabit, across the electromagnetic spectrum. Given that some models for the origin and evolution of GPS radio sources require a strong connection between the radio source morphology and the gaseous nuclear environment, such opportunities for detailed study are important. Our VLBI images of PKS 2254−367 show that the previously identified similarities between IC 1459 and NGC 1052 continue onto the pc-scale. Both compact radio sources appear to have symmetric jets of approximately the same luminosity, much lower than typically noted in compact double GPS sources. Similarities between PKS 2254−367 and NGC 1052, and differences with respect to other GPS galaxies, lead us to speculate that a sub-class of GPS radio sources, with low luminosity and with jet-dominated morphologies, exists and would be largely absent from radio source surveys with ∼1 Jy flux density cutoffs. We suggest that this possible low-luminosity, jet-dominated population of GPS sources could be an analog of the FR-I radio galaxies, with the higher luminosity lobe-dominated GPS sources being the analog of the FR-II radio galaxies.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The multifrequency parsec-scale structure of PKS 2254−367 (IC 1459): a luminosity-dependent break in morphology for the precursors of radio galaxies?

Tingay¹,

Edwards²

2015

Monthly Notices of the Royal Astronomical Society

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“…However Chandra observations of the supermassive black hole (SMBH) of IC 1459 show a weak X-ray source (L X = 8×10 40 ergs.s −1 , 0.3-8 keV, Fabbiano et al 2003) with a flux much lower than expected from a 2×10 9 M black hole (10x lower than normal radio loud galaxy, Cappellari et al 2002). IC1459 has also been found to be a Gigahertz-Peaked Spectrum (GPS) radio source (Tingay et al 2003) with a peak frequency of 2.5 GHz and low power. Serra & Oosterloo (2010) found that IC1459 has a SSP(single stellar population)-equivalent age of 3.5 +1.7 −0.4 Gyr using spectral line data from Tal et al (2009) and SSP models from Thomas et al (2003).…”

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confidence: 99%

SPECTRAL ENERGY DISTRIBUTION MAPPING OF TWO ELLIPTICAL GALAXIES ON SUB-kpc SCALES

Amblard¹,

Temi²,

Gaspari³

et al. 2016

ApJ

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We use high-resolution Herschel-PACS data of 2 nearby elliptical galaxies, IC1459 & NGC2768 to characterize their dust and stellar content. IC1459 & NGC2768 have an unusually large amount of dust for elliptical galaxies (1 to 3×10 5 M ), this dust is also not distributed along the stellar content. Using data from GALEX (ultra-violet) to PACS (far-infrared), we analyze the spectral energy distribution (SED) of these galaxies with CIGALEMC as a function of the projected position, binning images in 7.2" pixels. From this analysis, we derive maps of SED parameters, such as the metallicity, the stellar mass, the fraction of young star and the dust mass. The larger amount of dust in FIR maps seems related in our model to a larger fraction of young stars which can reach up to 4% in the dustier area. The young stellar population is fitted as a recent (∼ 0.5 Gyr) short burst of star formation for both galaxies. The metallicities, which are fairly large at the center of both galaxies, decrease with the radial distance with fairly steep gradient for elliptical galaxies.

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“…Spectral age constraints, energy supply arguments and, most convincingly, VLBI kinematic studies, are all consistent with the current radio activity in these objects having turned on less than about 1000 years ago (Conway 2002), although in some cases there is evidence that this is not the first instance of activity, but sources appear to have been re-activated after a period of quiescence (Baum et al 1990), perhaps by effect of merger activity (Tingay et al 2003). These sources thus offer the exciting opportunity of studying radio sources in early stages of development.…”

Section: Introductionmentioning

confidence: 66%

Constraints on evolutionary properties of GHz Peaked Spectrum galaxies

Tinti¹,

Zotti

2006

A&A

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We have used the available samples of Gigahertz Peaked Spectrum (GPS) galaxies to investigate their evolution properties in the framework of the "youth" scenario. Care was taken to properly allow for the different selection criteria used to define the samples. We find that the observed redshift and peak frequency distributions can be satisfactorily accounted for in terms of simple luminosity evolution of individual sources, along the lines discussed by Fanti et al. (1995, A&A, 302, 317) and Begelman (1996, in Proc. Cygnus A, Study of Radio Galaxy; 1999, in Proc. of KNAW Colloq.), although the derived parameter values have large uncertainties due to ambiguities in the selection of GPS sources and to the incompleteness of redshift measurements. However the simplest self-similar model, whereby the evolution is controlled only by the radial profile of the density of the ambient medium is not good enough and one additional parameter needs to be introduced. The fit requires a decrease of the emitted power and of the peak luminosity with source age or with decreasing peak frequency, at variance with the Snellen et al. (2000, MNRAS, 319, 445) model. On the other hand, our analysis confirms the rather flat slope of the luminosity function, found by Snellen et al. (2000) who also report indications of a high luminosity break, not required by the data sets we have used. Our results suggest that the GPS galaxies are the precursors of extended radio sources with luminosities below the break of the luminosity function. No cosmological evolution of the GPS galaxy population is required by presently available data.

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Identification of a new low-redshift GHz-peaked spectrum radio source and implications for the GHz-peaked spectrum class

Cited by 19 publications

References 45 publications

The multifrequency parsec-scale structure of PKS 2254−367 (IC 1459): a luminosity-dependent break in morphology for the precursors of radio galaxies?

The multifrequency parsec-scale structure of PKS 2254−367 (IC 1459): a luminosity-dependent break in morphology for the precursors of radio galaxies?

SPECTRAL ENERGY DISTRIBUTION MAPPING OF TWO ELLIPTICAL GALAXIES ON SUB-kpc SCALES

Constraints on evolutionary properties of GHz Peaked Spectrum galaxies

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