PKS 1151−348

PKS 1151−348
DESI Legacy Surveys image of PKS 1151−348
Observation data (J2000.0 epoch)
ConstellationHydra
Right ascension11h 54m 21.78s[1]
Declination−35° 05′ 29.06″[1]
Redshift0.258000[1]
Heliocentric radial velocity77,346 km/s[1]
Distance3.127 Gly
Apparent magnitude (V)17.84
Characteristics
TypeSy1[1]
Size~181,000 ly (55.6 kpc) (estimated)[1]
Other designations
2MASS J11542178−3505290, 2MASX J11542180−3505293, G4Jy 0965, LEDA 2826932, OM −386, NVSS J115421−350529, MRC 1151−348, TXS 1151−348, WB J1154− 3505, PAPER J178.59−35.04[1]

PKS 1151−348 is a quasar and a radio galaxy[2] located in the constellation of Hydra. The redshift of the object is (z) 0.258[1] and it was first discovered by astronomers conducting the Parkes Catalogue survey in September 1964.[3] It is also classified as a compact steep spectrum (CSS) quasar since the radio spectrum is mainly both compact and steep.[4][5][6]

Description

PKS 1151−348 is suggested to have a disturbed morphology based on evidence of an extended structure towards the direction of northwest. When imaged, it has either has presence of a tidal tail or an arc feature found connecting north with the secondary nucleus by 27 kiloparsecs from the host. A broad fan of radio emission is described elongating east from the nucleus with an extent of 38 kiloparsecs. This disturbed morphology indicates the host galaxy is currently interacting with a barred spiral galaxy companion in the early stages, with their nuclei yet to merge together.[7]

The optical spectrum of the galaxy mainly displays characteristics that are similar to broad-line radio galaxies. Based on results, the Balmer series lines are classified to be rich, strong with narrow-line features that contain high ionization.[5]

Radio imaging made by Very Long Baseline Interferometry (VLBI), found the source has two radio lobe structures that are measuring 0.2 kiloparsecs in extent with a much steeper spectrum measured for the south-western component compared to the north-western component. Both components also display 70% of the total flux density of the source. There is no evidence of a flat-spectrum component.[8] A radio core is found, indicated to have variability with a measured modulation index of 1.9% at 843 MHz frequencies.[9]

References

  1. ^ a b c d e f g h "NED Search results for PKS 1158-248". NASA/IPAC Extragalactic Database. Retrieved 2025-11-01.
  2. ^ Santoro, F.; Tadhunter, C.; Baron, D.; Morganti, R.; Holt, J. (2020-12-01). "AGN-driven outflows and the AGN feedback efficiency in young radio galaxies". Astronomy & Astrophysics. 644: A54. arXiv:2009.11175. Bibcode:2020A&A...644A..54S. doi:10.1051/0004-6361/202039077. ISSN 0004-6361.
  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. ^ Steppe, H.; Jeyakumar, S.; Saikia, D. J.; Salter, C. J. (November 1995). "Millimeter-wavelength observations of compact steep-spectrum sources". Astronomy and Astrophysics Supplement Series. 113: 409. ISSN 0365-0138.
  5. ^ a b Tadhunter, C. N.; Morganti, R.; di Serego Alighieri, S.; Fosbury, R. a. E.; Danziger, I. J. (August 1993). "Optical spectroscopy of a complete sample of southern 2-Jy radio sources". Monthly Notices of the Royal Astronomical Society. 263 (4): 999–1022. doi:10.1093/mnras/263.4.999. ISSN 0035-8711.
  6. ^ Middelberg, E.; Norris, R. P.; Tingay, S.; Mao, M. Y.; Phillips, C. J.; Hotan, A. W. (2008-11-01). "The first VLBI image of an infrared-faint radio source" (PDF). Astronomy & Astrophysics. 491 (2): 435–439. arXiv:0809.4922. Bibcode:2008A&A...491..435M. doi:10.1051/0004-6361:200810454. ISSN 0004-6361.
  7. ^ 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.
  8. ^ Tzioumis, A.; King, E.; Morganti, R.; Dallacasa, D.; Tadhunter, C.; Fanti, C.; Reynolds, J.; Jauncey, D.; Preston, R.; McCulloch, P.; Tingay, S.; Edwards, P.; Costa, M.; Jones, D.; Lovell, J. (2002-09-01). "A sample of southern Compact Steep Spectrum radio sources: The VLBI observations" (PDF). Astronomy & Astrophysics. 392 (3): 841–850. arXiv:astro-ph/0207495. Bibcode:2002A&A...392..841T. doi:10.1051/0004-6361:20020964. ISSN 0004-6361.
  9. ^ Bell, M. E.; Murphy, Tara; Hancock, P. J.; Callingham, J. R.; Johnston, S.; Kaplan, D. L.; Hunstead, R. W.; Sadler, E. M.; Croft, S.; White, S. V.; Hurley-Walker, N.; Chhetri, R.; Morgan, J. S.; Edwards, P. G.; Rowlinson, A. (January 2019). "The Murchison Widefield Array Transients Survey (MWATS). A search for low-frequency variability in a bright Southern hemisphere sample". Monthly Notices of the Royal Astronomical Society. 482 (2): 2484–2501. arXiv:1810.10152. doi:10.1093/mnras/sty2801. ISSN 0035-8711.
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