PKS 0442−28

PKS 0442−28
DESI Legacy Surveys image of PKS 0442−28
Observation data (J2000.0 epoch)
ConstellationEridanus
Right ascension04h 44m 37.70s[1]
Declination−28° 09′ 54.36″[1]
Redshift0.151468[1]
Heliocentric radial velocity45,409 km/s[1]
Distance1.965 Gly
Apparent magnitude (B)18.5
Characteristics
TypeElliptical NLRG[1]
Size~360,000 ly (110 kpc) (estimated)[1]
Other designations
2MASX J04443770−2809544, LEDA 745026, OF −271, MRSS 421−046487, TXS 0442−028, G4Jy 0492, PAPER J071.19−28.21, Cul 0442−082[1]

PKS 0442−28 is a narrow-line radio galaxy located in the constellation of Eridanus. The redshift of the galaxy is (z) 0.151[1] and it was first discovered as an astronomical radio source by astronomers lead by J.G. Bolton in December 1965.[2]

Description

PKS 0442−28 is classified as a Type 2 Fanaroff-Riley Class radio galaxy.[3][4][5] Its host is an elliptical galaxy based on a de Vaucouleurs model.[6] The total dust mass of the galaxy is estimated to be <6.5 Mʘ.[7] It also has been classified as a Seyfert type 2 galaxy.[8] It has a total flux density of 22.0 ± 0.3 mJy at 24 ɥm and 31.0 ± 5.0 at 70 ɥm.[9]

The host galaxy has a shell-like structure 50 kiloparsecs from the central nucleus in a southwest direction. The shell has an estimated surface brightness of around 25.7 magnitude per arcsecond. Several other galaxies are found within the field of the host galaxy, suggested to be interacting with it.[4]

Radio imaging made with the Very Large Array (VLA) have shown the source has a complex morphology. The source has both radio lobes and a compact radio core, however there are no signs of a radio jet.[10] An image made by the Chandra X-ray Observatory showed there is also radio emission extended and surrounding the base of its northern radio lobe. A bright region is found in the northern radio lobe in addition.[11] There are more detections of radio emission in the galaxy's other regions and hot spot features.[12]

References

  1. ^ a b c d e f g h "PKS 0442-28". NASA/IPAC Extragalactic Database. Retrieved 2025-10-20.
  2. ^ Bolton, J. G.; Clarke, Margaret E.; Ekers, R. D. (December 1965). "Identification of extragalactic radio sources between declinations -20° and -44°". Australian Journal of Physics. 18 (6): 627. Bibcode:1965AuJPh..18..627B. doi:10.1071/PH650627. ISSN 0004-9506.
  3. ^ Percival, W. J.; Miller, L.; McLure, R. J.; Dunlop, J. S. (2001), "The Host Galaxies of Luminous Radio-Quiet Quasars", QSO Hosts and Their Environments, Boston, MA: Springer US, pp. 21–26, doi:10.1007/978-1-4615-0695-9_3, ISBN 978-1-4613-5199-3, retrieved 2025-10-20{{citation}}: CS1 maint: work parameter with ISBN (link)
  4. ^ a b Ramos Almeida, C.; Tadhunter, C. N.; Inskip, K. J.; Morganti, R.; Holt, J.; Dicken, D. (October 2010). "The optical morphologies of the 2 Jy sample of radio galaxies: evidence for galaxy interactions". Monthly Notices of the Royal Astronomical Society: no. arXiv:1008.2683. doi:10.1111/j.1365-2966.2010.17542.x. ISSN 0035-8711.
  5. ^ Dicken, D.; Tadhunter, C.; Morganti, R.; Axon, D.; Robinson, A.; Magagnoli, M.; Kharb, P.; Ramos Almeida, C.; Mingo, B.; Hardcastle, M.; Nesvadba, N. P. H.; Singh, V.; Kouwenhoven, M. B. N.; Rose, M.; Spoon, H. (2014-05-28). "SPITZERMID-IR SPECTROSCOPY OF POWERFUL 2Jy AND 3CRR RADIO GALAXIES. II. AGN POWER INDICATORS AND UNIFICATION". The Astrophysical Journal. 788 (2): 98. arXiv:1405.0670. Bibcode:2014ApJ...788...98D. doi:10.1088/0004-637x/788/2/98. ISSN 0004-637X.
  6. ^ Inskip, K. J.; Tadhunter, C. N.; Morganti, R.; Holt, J.; Ramos Almeida, C.; Dicken, D. (2010-07-15). "A near-IR study of the host galaxies of 2 Jy radio sources at 0.03 ≲z≲ 0.5 - I. The data★". Monthly Notices of the Royal Astronomical Society. 407 (3): 1739–1766. arXiv:1005.2195. doi:10.1111/j.1365-2966.2010.17002.x. ISSN 0035-8711.
  7. ^ Tadhunter, C; Oosterloo, T; Morganti, R; Almeida, C Ramos; Martín, M Villar; Emonts, B; Dicken, D (2024-07-17). "An ALMA CO(1-0) survey of the 2Jy sample: large and massive molecular discs in radio AGN host galaxies". Monthly Notices of the Royal Astronomical Society. 532 (4): 4463–4485. doi:10.1093/mnras/stae1745. hdl:10261/409028. ISSN 0035-8711.
  8. ^ Bassani, L.; Venturi, T.; Molina, M.; Malizia, A.; Dallacasa, D.; Panessa, F.; Bazzano, A.; Ubertini, P. (2016-06-20). "Soft γ-ray selected radio galaxies: favouring giant size discovery". Monthly Notices of the Royal Astronomical Society. 461 (3): 3165–3171. arXiv:1606.05456. doi:10.1093/mnras/stw1468. ISSN 0035-8711.
  9. ^ "Correction to: Deep Herschel observations of the 2 Jy sample: assessing the non-thermal and AGN contributions to the far-IR continuum". Monthly Notices of the Royal Astronomical Society. 523 (3): 3286. 2023-06-08. doi:10.1093/mnras/stad1479. ISSN 0035-8711.
  10. ^ Morganti, R.; Oosterloo, T.; Tadhunter, C. N.; Aiudi, R.; Jones, P.; Villar-Martin, M. (December 1999). "The radio structures of southern 2-Jy radio sources: New ATCA and VLA radio images". Astronomy and Astrophysics Supplement Series. 140 (3): 355–372. arXiv:astro-ph/9910150. Bibcode:1999A&AS..140..355M. doi:10.1051/aas:1999427. ISSN 0365-0138.
  11. ^ Mingo, B.; Hardcastle, M. J.; Ineson, J.; Mahatma, V.; Croston, J. H.; Dicken, D.; Evans, D. A.; Morganti, R.; Tadhunter, C. (2017-05-29). "An X-ray survey of the 2 Jy sample – II. X-ray emission from extended structures". Monthly Notices of the Royal Astronomical Society. 470 (3): 2762–2779. arXiv:1705.09578. doi:10.1093/mnras/stx1307. ISSN 0035-8711.
  12. ^ Dicken, D.; Tadhunter, C.; Morganti, R.; Buchanan, C.; Oosterloo, T.; Axon, D. (2008-05-10). "The Origin of the Infrared Emission in Radio Galaxies. I. New Mid- to Far-Infrared and Radio Observations of the 2 Jy Sample". The Astrophysical Journal. 678 (2): 712–728. arXiv:0803.1623. Bibcode:2008ApJ...678..712D. doi:10.1086/529544. ISSN 0004-637X.
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