PKS J0116-4722

Last updated
PKS J0116-2722
DSS image of PKS J0116-4722.jpg
The radio galaxy PKS J0116-4722.
Observation data
Constellation Phoenix
Right ascension 01h 16m 25.039s [1]
Declination −47° 22′ 41.189″ [1]
Redshift 0.147800 [1]
Heliocentric radial velocity 44,309 km/s [1]
Distance 2.235 Gly (685.4 Mpc)
Apparent magnitude  (V)16.5
Characteristics
Type Elliptical, FR II, Giant Radio Source [1]
Size~346,000  ly (106.1  kpc) (estimated) [1]
Other designations
PKS 0114-47, Cul 0114-476, PGC 4603, GRS J0116-4722, 0114-47 [1]

PKS J0116-4722 also known as J0116-473 in literature, [2] is a radio galaxy located in the constellation of Phoenix. Its redshift is (z) 0.147800 [1] and it was first discovered as a radio source by astronomers who were conducting the Parkes Catalogue of Radio Sources survey in 1964, designated as PKS 0114-47. [3]

Contents

Description

PKS J0116-4722 is classified as a giant Fanaroff-Riley Type II radio galaxy with a total radio luminosity of 2.2 x 1026 W Hz -1 and a linear size of 2.1 megaparsecs. [4] [5] [2] It is located in a sparse galaxy environment with three galaxies encircling it. [6]

PKS J0116-4722 has a variable radio core described as a point-like source, with an X-ray spectrum best fitted with a double power law of 0.3-0.8 kiloelectron volts (KeV). [4] [7] A wiggled jet is seen emerging from the core, curving through a large angle and terminating at an emission-plateau. There is a peculiar feature shown as linear and intersecting the source between the jet's bright knot and the core. [8] Earlier observations described it, a giant complex source. [9]

Two massive radio lobes are found in PKS J0116-2722. They are described as edge-brightened and showing polarization on their outer boundaries. However, both ends of the lobes showed absence of compact hotspots; instead having warm spots in their place. Radio imaging observations by Australia Telescope Compact Array (ATCA), showed the galaxy has an inner set of radio lobes located north and south, with radio luminosities of 2 x 1025 W Hz-1. However the inner northern lobe is short and diffused, while the inner southern lobe is described as elongated, displaying radio emission peaks. These inner lobes in the galaxy are implied to be formed from renewed nuclear core activity, happening around (3-5) x 106 years ago. [2]

A bar-like feature has been discovered by ATCA in the southern radio lobe of PKS J0116-2722. When observed, it has a sharp bound along the galaxy's northern edge, appearing as a separate component. [2] This bar-like feature has high degree of fractional polarization [10] and a steep radio spectra index in its emission. [2] Should this feature be described as a wing feature, PKS J0116-2722 can be reclassified as an X-shaped radio galaxy. [11]

References

  1. 1 2 3 4 5 6 7 8 "NED search results for PKS J0116-4722". NASA/IPAC Extragalactic Database. Retrieved 2025-05-17.
  2. 1 2 3 4 5 Saripalli, Lakshmi; Subrahmanyan, Ravi; Udaya Shankar, N. (2002-01-20). "A Case for Renewed Activity in the Giant Radio Galaxy J0116−473". The Astrophysical Journal. 565 (1): 256–264. arXiv: astro-ph/0209570 . Bibcode:2002ApJ...565..256S. doi:10.1086/324600. ISSN   0004-637X.
  3. ↑ Bolton, J. G.; Gardner, F. F.; Mackey, M. B. (September 1964). "The Parkes catalogue of radio sources, declination zone -20° to -60°". Australian Journal of Physics. 17 (3): 340. Bibcode:1964AuJPh..17..340B. doi:10.1071/PH640340. ISSN   0004-9506.
  4. 1 2 Konar, C.; Hardcastle, M. J.; Jamrozy, M.; Croston, J. H. (2013-02-14). "Episodic radio galaxies J0116−4722 and J1158+2621: can we constrain the quiescent phase of nuclear activity?". Monthly Notices of the Royal Astronomical Society. 430 (3): 2137–2153. doi: 10.1093/mnras/stt040 . ISSN   1365-2966.
  5. ↑ Wan, Lin; Daly, Ruth A. (August 1996). "Classical Double Radio Galaxies and Their Gaseous Environments". The Astrophysical Journal. 467: 145. Bibcode:1996ApJ...467..145W. doi:10.1086/177590. ISSN   0004-637X.
  6. ↑ Malarecki, J. M.; Jones, D. H.; Saripalli, L.; Staveley-Smith, L.; Subrahmanyan, R. (2015-03-19). "Giant radio galaxies – II. Tracers of large-scale structure". Monthly Notices of the Royal Astronomical Society. 449 (1): 955–986. doi: 10.1093/mnras/stv273 . ISSN   1365-2966.
  7. ↑ Konar, C; Hardcastle, M J; Croston, J H; Jamrozy, M; Hota, Ananda; Das, Tapas K (2019-04-20). "Mode of accretion in episodic radio galaxies and the dynamics of their outer relic lobes". Monthly Notices of the Royal Astronomical Society. 486 (3): 3975–3991. doi: 10.1093/mnras/stz1089 . ISSN   0035-8711.
  8. ↑ Subrahmanyan, Ravi; Saripalli, Lakshmi; Hunstead, Richard W. (March 1996). "Morphologies in megaparsec-size powerful radio galaxies". Monthly Notices of the Royal Astronomical Society. 279 (1): 257–274. doi: 10.1093/mnras/279.1.257 . ISSN   0035-8711.
  9. ↑ Jones, Paul A.; McAdam, W. B. (May 1992). "The Structure of Southern Extragalactic Radio Sources". The Astrophysical Journal Supplement Series. 80: 137. Bibcode:1992ApJS...80..137J. doi:10.1086/191662. ISSN   0067-0049.
  10. ↑ Saikia, D. J.; Jamrozy, M. (September 2009). "Recurrent activity in Active Galactic Nuclei". Bulletin of the Astronomical Society of India. 37: 63–89. arXiv: 1002.1841 . Bibcode:2009BASI...37...63S. ISSN   0304-9523.
  11. ↑ Saripalli, Lakshmi; Subrahmanyan, Ravi (2009-03-30). "The Genesis of Morphologies in Extended Radio Sources: X-Shapes, Off-Axis Distortions, and Giant Radio Sources". The Astrophysical Journal. 695 (1): 156–170. arXiv: 0811.1907 . Bibcode:2009ApJ...695..156S. doi:10.1088/0004-637x/695/1/156. ISSN   0004-637X.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.