Skip to main content
Log in

Decoding the giant extragalactic radio sources

  • Scientific Review
  • Published:
Journal of Astrophysics and Astronomy Aims and scope Submit manuscript

Abstract

Giant radio sources (GRSs) defined to be >0.7 Mpc are the largest single objects in the Universe and can be associated with both galaxies (GRGs) and quasars (GRQs). They are important for understanding the evolution of radio galaxies and quasars whose sizes range from pc to Mpc scales and are also valuable probes of their environment. These radio-loud active galactic nuclei (RLAGN) interact with the interstellar medium of the host galaxy on small scales and the large-scale intracluster or intergalactic medium for the GRSs. With several new and sensitive surveys over the last few years, the number of known GRSs has increased many fold, which has led a resurgence of interest in the field. This review article summarises our current understanding of these sources based on nearly five decades of research, and discusses the importance of the Square Kilometer Array (SKA) in addressing some of the outstanding questions.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

Similar content being viewed by others

Notes

  1. Defined as \(S(\nu ) \propto \nu ^{-\alpha }\), where S\((\nu )\) is the flux density at a frequency \(\nu \). We use this convention throughout this paper unless specified otherwise.

  2. https://www.skao.int/en.

  3. https://radio.galaxyzoo.org.

  4. https://www.radathomeindia.org.

  5. https://www.zooniverse.org/projects/chrismrp/radio-galaxy-zoo-lofar.

  6. https://sites.google.com/site/anantasakyatta/saganSAGAN: Search and Analysis of GRGs with Associated Nuclei.

  7. Kaiser et al. (1997).

  8. However, most of the estimation of GRS as well as normal-sized radio sources was either carried before (e.g., see Mack et al. 1998) this or have not used it.

  9. https://icecube.wisc.edu/about-us/overview/.

References

Download references

Acknowledgements

We thank the anonymous referee for her/his valuable comments and suggestions. We are thankful to Naoki Isobe (JAXA) for providing us with the data from his papers. We thank Martijn Oei for sharing his results from LoTSS DR2. We thank Heinz Andernach, Marek Jamrozy, Agnieszka Kuźmicz and Sagar Sethi for their valuable feedback. We also thank Shishir Sankhyayan for his help. We gratefully acknowledge the use of Edward (Ned) Wright’s online Cosmology Calculator. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in Ochsenbein et al. (2000). This research has made use of the NASA/IPAC Extragalactic Database (NED), which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. Hubble space telescope images have been obtained from the Hubble legacy archive: http://hla.stsci.edu. We acknowledge the use of the data from the legacy surveys: https://www.legacysurvey.org/acknowledgment/. We acknowledge that this work has made use of ASTROPY (Astropy Collaboration et al. 2013).

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Pratik Dabhade.

Additional information

This article is part of the Special Issue on “Indian Participation in the SKA”.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Dabhade, P., Saikia, D.J. & Mahato, M. Decoding the giant extragalactic radio sources. J Astrophys Astron 44, 13 (2023). https://doi.org/10.1007/s12036-022-09898-5

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s12036-022-09898-5

Keywords

Navigation