The host galaxies of Compact Steep Spectrum and Gigahertz‐Peaked Spectrum radio sources

Holt, J.

doi:10.1002/asna.200811163

Cited by 13 publications

(16 citation statements)

References 43 publications

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“…If this is the case, the location of the CSS sources close to the RFIRC may actually be a consequence of the 1.4‐GHz luminosity being dominated by star formation, and the host galaxy being a composite object. This would be consistent with earlier work suggesting that CSS sources are actively star forming (O’Dea 1998; Labiano et al 2008; Holt 2009; Morganti et al 2009), and highlight this population as an ideal resource for exploring AGN feedback effects on star formation in galaxies. Only the use of radio discriminants (such as morphology or spectral index) will indicate whether the object hosts an AGN (Roy et al 1998; Norris, Middelberg & Boyle 2007).…”

Section: Discussionsupporting

confidence: 91%

Spectral index properties of milliJansky radio sources

Randall

Hopkins

Norris

et al. 2012

Monthly Notices of the Royal Astronomical Society

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At the faintest radio flux densities (S_1.4 < 10 mJy), conflicting results have arisen regarding whether there is a flattening of the average spectral index between a low radio frequency (325 or 610 MHz), and e.g. 1.4 GHz. We present a new catalogue of 843 MHz radio sources in the ELAIS-S1 field that contains the sources, their ATLAS counterparts, and the spectral index distributions of the sources as a function of flux density. We do not find any statistically significant evidence for a trend towards flatter spectral indices with decreasing flux density. We then investigate the spectral index distribution with redshift for those sources with reliable redshifts and explore the infrared properties. An initial sample of faint Compact Steep Spectrum sources in ATLAS is also presented, with a brief overview of their properties.Comment: Accepted for publication in MNRAS. 18 pages, 19 figures, 6 tables. The full version of Table 1 will be available in the online version of the articl

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Section: Discussionsupporting

confidence: 91%

Spectral index properties of milliJansky radio sources

Randall

Hopkins

Norris

et al. 2012

Monthly Notices of the Royal Astronomical Society

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“…It has been suggested (O'Dea 1998; Fanti 2009a; Holt 2009) that a significant fraction of CSS and GPS hosts are interacting. Of the 64 sources in the O'Dea sample, 57 per cent of the GPS sources show a disturbed nucleus and 13 per cent have a second nucleus nearby.…”

Section: Results and Interesting Sourcesmentioning

confidence: 99%

An unbiased sample of bright southern compact steep spectrum and gigahertz peaked spectrum sources

Randall¹,

Hopkins²,

Norris³

et al. 2011

Monthly Notices of the Royal Astronomical Society

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Compact Steep Spectrum (CSS) and Gigahertz Peaked Spectrum (GPS) sources are classes of compact, powerful, extragalactic objects. These sources are thought to be the earliest stages in the evolution of radio galaxies, capturing the ignition (or, in some cases, re‐ignition) of the active galactic nucleus. As well as serving as probes of the early stages of large‐scale radio sources, these sources are good, stable, amplitude calibrators for radio telescopes. We present an unbiased flux density limited (>1.5 Jy at 2.7 GHz) catalogue of these objects in the Southern hemisphere, including tabulated data, radio spectra, and where available, optical images and measurements. The catalogue contains 26 sources, consisting of two new candidates and 15 known CSS sources, and nine known GPS sources. We present new Australia Telescope Compact Array (ATCA) data on 10 of these 26 sources, and data on a further 42 sources which were excluded from our final sample. This bright sample will serve as a reference sample for comparison with subsequent faint (mJy level) samples of CSS and GPS candidates currently being compiled.

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“…Interactions of the radio source with the galaxy interstellar medium are clear from the study of the emission lines (see, e.g., Labiano et al 2005;Holt et al 2009). The presence of young stellar populations in these objects has been revealed several times (Holt 2009;Labiano et al 2008;deVries et al 2007;Tadhunter et al 2002). Their origin is attributed to the shocks generated by the young radio source expanding into the interstellar medium (Rees 1989;Mellema et al 2002;Bicknell et al 2000), and/or as the result of a galaxy merger process which, at some later epoch, also triggered the onset of the radio source (Raimann et al 2005;Holt 2009).…”

Section: Introductionmentioning

confidence: 95%

“…The presence of young stellar populations (YSP) in young radio galaxies has been pointed out by several authors (see, e.g., Holt 2009;Labiano et al 2008). Two major processes are invoked for their origin: jet induced star formation and galaxy merger.…”

Section: Young Stellar Population(s)?mentioning

confidence: 99%

The B3-VLA CSS sample

Fanti

Zanichelli

et al. 2011

A&A

120

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Context. Compact steep-spectrum radio sources and giga-hertz peaked spectrum radio sources (CSS/GPS) are generally considered to be mostly young radio sources. In recent years we studied at many wavelengths a sample of these objects selected from the B3-VLA catalog: the B3-VLA CSS sample. Only ≈60% of the sources were optically identified. Aims. We aim to increase the number of optical identifications and study the properties of the host galaxies of young radio sources. Methods. We cross-correlated the CSS B3-VLA sample with the Sloan Digital Sky Survey (SDSS), DR7, and complemented the SDSS photometry with available GALEX (DR 4/5 and 6) and near-IR data from UKIRT and 2MASS. Results. We obtained new identifications and photometric redshifts for eight faint galaxies and for one quasar and two quasar candidates. Overall we have 27 galaxies with SDSS photometry in five bands, for which we derived the ultraviolet-optical spectral energy distribution (UV-O-SED). We extended our investigation to additional CSS/GPS selected from the literature. Most of the galaxies show an excess of ultra-violet (UV) radiation compared with the UV-O-SED of local radio-quiet ellipticals. We found a strong dependence of the UV excess on redshift and analyzed it assuming that it is generated either from the nucleus (hidden quasar) or from a young stellar population (YSP). We also compare the UV-O-SEDs of our CSS/GPS sources with those of a selection of large size (LSO) powerful radio sources from the literature. Conclusions. If the major process of the UV excess is caused by a YSP, our conclusion is that it is the result of the merger process that also triggered the onset of the radio source with some time delay. We do not see evidence for a major contribution from a YSP triggered by the radio sources itself.

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The host galaxies of Compact Steep Spectrum and Gigahertz‐Peaked Spectrum radio sources

Cited by 13 publications

References 43 publications

Spectral index properties of milliJansky radio sources

Spectral index properties of milliJansky radio sources

An unbiased sample of bright southern compact steep spectrum and gigahertz peaked spectrum sources

The B3-VLA CSS sample

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