GPS radio sources: new optical observations and an updated master list

Labiano, Á.; Barthel, Pieter; O’Dea, C. P.; Vries, W. H. de; Pérez, I. de la Calle; Baum, Stefi A.

doi:10.1051/0004-6361:20066183

Cited by 67 publications

(88 citation statements)

References 58 publications

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“…In our plot the large majority of galaxies are distributed within the two limiting lines by Labiano et al (2007) and are slightly brighter than a typical GPS. We note two galaxies out of those boundaries.…”

Section: Hubble Diagramsmentioning

confidence: 70%

“…the old red magnitudes (Col. 3 of Table A.1). We also plot two lines from a recent plot of radio galaxies with z ≤ 1 (Labiano et al 2007), which includes more than 90% of those plotted objects. We also show the best-fit line for GPS galaxies by Snellen et al (2002).…”

Section: Hubble Diagramsmentioning

confidence: 99%

“…We supplemented the B3-VLA CSS sample with a set of CSOs/MSOs with SDSS photometry, both quasars and galaxies (11 and 12 respectively), taken from the 3C and PW catalogs (Fanti et al 1995), from Labiano et al (2007) and 9C catalog (Inskip et al 2006b). All these sources are reported in Table D.1.…”

Section: Uv-optical Spectral Energy Distributions Of Csos/msosmentioning

confidence: 99%

“…All these sources are reported in Table D.1. The samples are separated by horizontal lines and are, in the order from top to bottom: B3-VLA, 3C, PW, Labiano et al (2007) and 9C. We transformed the SDSS magnitudes into flux densities following the prescriptions given in the SDSS site.…”

Section: Uv-optical Spectral Energy Distributions Of Csos/msosmentioning

confidence: 99%

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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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Section: Hubble Diagramsmentioning

confidence: 70%

Section: Hubble Diagramsmentioning

confidence: 99%

Section: Uv-optical Spectral Energy Distributions Of Csos/msosmentioning

confidence: 99%

Section: Uv-optical Spectral Energy Distributions Of Csos/msosmentioning

confidence: 99%

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The B3-VLA CSS sample

Fanti

Zanichelli

et al. 2011

A&A

120

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“…Labiano et al (2007) have compiled a master list of 172 GPS and HFPs. Here, the main problem is still discussing the optical counterpart: 59 sources are hosted by QSOs, 82 by galaxies, and 31 are still empty fields.…”

Section: Statisticsmentioning

confidence: 99%

Samples and statistics of CSS and GPS sources

Giroletti

Polatidis

2009

Astron Nachr

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The dates of receipt and acceptance should be inserted later Several samples have been proposed in the last years in order to study the properties of intrinsically small sources. In this paper, we review the properties of the main samples that are currently available, both selected on the basis of spectral index and of morphology. As a result of the work in this area, large numbers of intrinsically small sources have been found. We summarize the present status of hot spot advance measurements, listing 18 sources with available VLBI data. The mean hot spot separation velocity is vsep = (0.19 ± 0.11)h −1 c and the kinematic ages span the range from 20 to 3000 years. Finally, we present a brief outlook on the use of future instrumentation in order to improve our understanding of radio source evolution. Prospects for VSOP2, e-VLA, e-MERLIN, LOFAR, ALMA, and Fermi are suggested.

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Structure, spectra and variability of some GPS radio sources

Liu¹,

Song

Cui

2009

Astron Nachr

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We report the results of multifrequency-VLBI observations of GHz-Peaked-Spectrum (GPS) radio sources. The VLBI structure and component spectra of some GPS sources are presented. Our VLBI results show that about 80% of the GPS galaxies exhibit a compact double or CSO-like structure, while the GPS quasars tend to show a core-jet. The component spectra of the GPS galaxies are often steep/convex, and the core has a flat spectrum but it is usually hidden or weak. In addition, we studied the variability of GPS sources by comparing new flux density measures, acquired with the Urumqi 25m telescope at 4.85 GHz, with previous 87GB data. The results show that 44% of the GPS quasars varied higher than 10% in passed 20 years, while the fraction is only 12% for the GPS galaxies meaning that the GPS quasars are much more variable than GPS galaxies. In total, 25% of GPS sources show >10% variability at 4.85 GHz in our sample.Comment: 4 pages, 7 figure

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GPS radio sources: new optical observations and an updated master list

Cited by 67 publications

References 58 publications

The B3-VLA CSS sample

The B3-VLA CSS sample

Samples and statistics of CSS and GPS sources

Structure, spectra and variability of some GPS radio sources

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