An optical study of compact steep-spectrum radio sources. 1: The spectroscopic data

Gelderman, Richard; Whittle, M.

doi:10.1086/191946

Cited by 181 publications

(177 citation statements)

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“…See text for more details. We added samples of more powerful compact sources (orange crosses: Gelderman et al 1994;magenta plus: Morganti et al 1997), to verify the optical-radio correlation. Moreover, we superimposed the 3CR LEG and HEG sources (gray and cyan small squares, Buttiglione et al 2010) to compare compact sources with extended ones.…”

Section: Optical-radio Correlationmentioning

confidence: 99%

Compact sources in the Bologna Complete Sample: high-resolution VLA observations and optical data

Liuzzo

Buttiglione

Giovannini

et al. 2013

A&A

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Context. Among radio galaxies, compact sources are a class of objects that are not yet well understood, and most of them cannot be included in classical populations of compact radio sources (flat-spectrum or compact steep-spectrum sources). Aims. Our main goal is to analyze the radio and optical properties of a sample of compact sources and compare them with Faranoff-Riley I and II extended radio galaxies. Methods. We selected in the Bologna Complete Sample a subsample of compact sources, naming it the C BCS sample. We collected new and literature subarcsecond resolution multi-frequency VLA images and optical data. We compared total and nuclear radio power with optical emission line measurements. Results. The [OIII] luminosity − 408 MHz total power relation found in high-and low-excitation galaxies as well as in young (CSS) sources holds also for the C BCSs. However, C BCSs present higher [OIII] luminosity than expected at a given total radio power, and they show the same correlation as core radio galaxies, but with a higher radio power. Conclusions. The C BCSs appear to be the high-power tail of core radio galaxies. For most of the C BCSs, the morphology seems to be strongly dependent on the presence of dense environments (e.g., cluster or HI-rich galaxies) and on a young age or restarted radio activity.

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Section: Optical-radio Correlationmentioning

confidence: 99%

Compact sources in the Bologna Complete Sample: high-resolution VLA observations and optical data

Liuzzo

Buttiglione

Giovannini

et al. 2013

A&A

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“…In order to do this we have used the information from references quoted in Sect. 2 and the following ones, which were useful for classification according to stellar population and/or emitting gas characteristics: Heckman et al (1980);Caldwell (1984); Dahari (1985); Filippenko & Sargent (1985); Bica & Alloin (1987a,b); Davies et al (1987); Bettoni & Buson (1987); Gregg (1989); Bonatto et al (1989);Terlevich et al (1991);Bica et al (1991); Buson et al (1993); Osterbrock & Martel (1993); Goudfrooij et al (1994);Gelderman & Whittle (1994); Storchi-Bergmann et al (1995).…”

Section: Spectral Groupsmentioning

confidence: 99%

Ultraviolet properties of early-type galaxies

Bonatto

Bica

Pastoriza

et al. 1996

Astron. Astrophys. Suppl. Ser.

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Abstract. -We analyse the UV properties of early-type galaxies from their UV spectra in the IUE library, including both normal and active nuclei. We co-added the spectra, and hence the objects into groups of similar spectral properties in the UV, also taking into account their properties in the visible/near-infrared ranges. Although, owing to the presence of a residual fixed pattern noise, IUE data cannot be improved by co-addition as expected for spectra containing only random noise, this procedure still provided spectra of higher signal/noise ratio than in previous studies, often based on individual spectra and therefrom derived colour indices. Thanks to the co-adding procedure, information on spectral features can now be assessed. The red stellar population groups exhibit a far-UV flux at different levels. The higher ones denote the presence of the UV turnup, which possibly exhibits absorption features, at least as detected through the IUE aperture. As to the blue stellar population groups and/or AGNs, we have carried out simple syntheses with UV star cluster templates and galaxy spectra in order to infer the properties such as burst ages and contamination by an active nucleus. It has been possible to derive information on the extinction law affecting some internally reddened galaxies; there are cases where the presence of the λ2200Å absorption feature suggests a reddening law similar to the Galactic one, and others without the λ2200Å feature, suggesting that it is rather an SMC type law which applies, then.

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“…Broad [O iii] λ 5007 Å line emission suggests strong interaction between the radio source and host galaxy interstellar medium (ISM). Figure 6 shows the distribution of [O iii] λ 5007 Å linewidths for the compact radio-excess objects compared with other classes of objects, including CSS sources (Gelderman & Whittle 1997). The broad linewidths in the radio-excess IRAS galaxies are similar to those in CSS sources, consistent with strong interaction between the embedded radio source and host galaxy ISM, and presumably relating to the driving of radiative shocks into the ambient gas.…”

Section: Weak Radio Jets?mentioning

confidence: 86%

Radio-Excess IRAS Galaxies: Low Power CSS/GPS Sources?

Drake

McGregor

Bicknell

et al. 2003

Publ. – Astron. Soc. Aust

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Amongst our sample of radio-excess IRAS galaxies, we have identified compact steep spectrum radio sources that fall into the classes of CSS or GPS sources, but have not previously been identified as such. The sample includes objects that have radio powers as low as ∼10 22 WHz −1 . We suggest that these are low-power analogues of CSS and GPS sources, with weaker radio jets. These may be precursors to FR i radio galaxies or may 'fade' into radio-quiet galaxies.

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An optical study of compact steep-spectrum radio sources. 1: The spectroscopic data

Cited by 181 publications

References 0 publications

Compact sources in the Bologna Complete Sample: high-resolution VLA observations and optical data

Compact sources in the Bologna Complete Sample: high-resolution VLA observations and optical data

Ultraviolet properties of early-type galaxies

Radio-Excess IRAS Galaxies: Low Power CSS/GPS Sources?

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