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.

Liuzzo E., Buttiglione S., Giovannini G., Giroletti M., Capetti A., Taylor G. B. (2013). Compact sources in the Bologna Complete Sample: high-resolution VLA observations and optical data. ASTRONOMY & ASTROPHYSICS, 550, 76-91 [10.1051/0004-6361/201220012].

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

LIUZZO, ELISABETTA;GIOVANNINI, GABRIELE;GIROLETTI, MARCELLO;
2013

Abstract

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.
2013
Liuzzo E., Buttiglione S., Giovannini G., Giroletti M., Capetti A., Taylor G. B. (2013). Compact sources in the Bologna Complete Sample: high-resolution VLA observations and optical data. ASTRONOMY & ASTROPHYSICS, 550, 76-91 [10.1051/0004-6361/201220012].
Liuzzo E.; Buttiglione S.; Giovannini G.; Giroletti M.; Capetti A.; Taylor G. B.
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/133901
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 4
social impact