Optical CCD imaging of GHz-peaked-spectrum radio sources

Stanghellini, C.; O'dea, C. P.; Baum, S. A.; Laurikainen, E.

doi:10.1086/191812

Cited by 78 publications

(105 citation statements)

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“…3) (Fig. 4) confirms the earlier identification of this well known GPS radio source (also known as CTA21), by Stanghellini et al (1993). We find a rather compact host, and note that the object seen 8 NNW of the CTA21 identification in the Stanghellini et al image is unrelated.…”

Section: B0008-421supporting

confidence: 85%

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

Labiano

Barthel²,

O’Dea

et al. 2006

A&A

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Aims. We identify optical counterparts, address uncertain identifications and measure previously unknown redshifts of the host galaxies of candidate GPS radio sources, and study their stellar populations. Methods. Long slit spectroscopy and deep optical imaging in the B, V and R bands, obtained with the Very Large Telescope. Results. We obtain new redshifts for B0316+161, B0407-658, B0904+039, B1433-040, and identify the optical counterparts of B0008-421 and B0742+103. We confirm the previous identification for B0316+161, B0407-658, B0554-026, and B0904+039, and find that the previous identification for B0914+114 is incorrect. Using updated published radio spectral information, we classify as non GPS the following sources: B0407-658, B0437-454, B1648+015. The optical colors of typical GPS sources are consistent with single instantaneous burst stellar population models but do not yield useful information on age or metallicity. A new master list of GPS sources is presented.

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Section: B0008-421supporting

confidence: 85%

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

Labiano

Barthel²,

O’Dea

et al. 2006

A&A

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“…Other faint objects are present a few arcseconds away, suggesting 1604+315 is a member of a cluster (Stanghellini et al 1993). Our VLBI image shows no details (Fig.…”

Section: +315 (J1606+3124)mentioning

confidence: 96%

EVN observations of candidate Compact Symmetric Objects

Ling¹,

Stanghellini

Dallacasa

et al. 2002

A&A

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Abstract. We present pc-scale images of ten Compact Symmetric Objects (CSO) candidates observed with the European VLBI network (EVN). Five radio sources have been observed at 1.6 GHz, and five more at 2.3/8.4 GHz, the latter subsample with the inclusion in the VLBI array of 3 antennae normally used for geodesy. These objects were selected from existing samples of GHz Peaked Spectrum (GPS) radio sources with the purpose to find and/or confirm the CSO classification. These new VLBI observations allow us to confirm the classification of two CSO candidates, and to find a few new ones. The association of GPS radio galaxies with a CSO morphology is strengthened by our findings, and this result suggests an efficient way to increase the number of known CSOs by means of VLBI observations of compact radio galaxies showing a convex radio spectrum.

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“…Our sample is chosen to be representative of GPS and CSS sources with z < ∼ 0.5, and nearby enough to eliminate strong effects due to evolution with cosmic time. The objects are drawn primarily from the well-defined samples of Fanti et al (1990), Fanti et al (2001), Stanghellini (1992) and Stanghellini et al (1997). The comparison sample of large 3CR sources consists of FR I and FR II sources with redshifts less than 0.1 observed in the near-UV by Allen et al (2002).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

“…A long known peaked spectrum radio source (e.g., Véron 1971). The counterpart of this GPS source is a m R = 15.5 galaxy (e.g., Stanghellini et al 1993) at z = 0.12174 1 The Sersic profiles are used to parameterize the data. It does not necessarily imply that these UV components are galaxies.…”

Section: Notes On Individual Sourcesmentioning

confidence: 99%

Star formation in the hosts of GHz peaked spectrum and compact steep spectrum radio galaxies

Labiano¹,

O’Dea

Barthel³

et al. 2007

A&A

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Aims. We are searching for star formation regions in the hosts of potentially young radio galaxies (gigahertz peaked spectrum and compact steep spectrum sources). Methods. We used near-UV imaging with the Hubble Space Telescope Advanced Camera for Surveys. Results. We find near-UV light could be the product of recent star formation in five of the nine observed sources, though other explanations are not currently ruled out. An additional two sources show marginal detections. The UV luminosities of the GPS and CSS sources are similar to those of a sample of nearby large-scale radio galaxies. Stellar-population synthesis models are consistent with a burst of recent star formation occurring before the formation of the radio source. However, observations at other wavelengths and colors are needed to definitively establish the nature of the observed UV light. In the CSS source 1443+77, the near-UV light is aligned with and is co-spatial with the radio source. We suggest that the UV light in this source is produced by star formation triggered and/or enhanced by the radio source.

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Optical CCD imaging of GHz-peaked-spectrum radio sources

Cited by 78 publications

References 0 publications

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

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

EVN observations of candidate Compact Symmetric Objects

Star formation in the hosts of GHz peaked spectrum and compact steep spectrum radio galaxies

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