PKS 0727-11

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PKS 0727-11
Image of quasar PKS 0727-11.png
SDSS image of blazar PKS 0727-11.
Observation data (J2000.0 epoch)
Constellation Puppis
Right ascension 07h 30m 19.11s
Declination −11° 41′ 12.60″
Redshift 1.591000
Heliocentric radial velocity 476,970 km\s
Distance 9.556 Gly
Apparent magnitude  (V)20.30
Characteristics
Type FSRQ
Other designations
NVSS J073019-114112, TXS 0727-115, PKS J0730-1141, 3FGL J0730.2-1141

PKS 0727-11 is a blazar [1] located in southern constellation of Puppis. The redshift of the object has been determined as (z) 1.591, [2] with it first being discovered during the Parkes survey conducted at the Parkes Observatory in 1966. [3] The radio spectrum of the object is flat, classifying it a flat-spectrum radio source. [4] [5] [6]

Contents

Description

PKS 0727-11 has been found variable on the electromagnetic spectrum. It is noted for its variable flux density near 5 GHz and at the 10.6 GHz mark when it was observed between 1968 and 1969, with evidence of rapid variations at 2.3 GHz in 1971. [7] It also had an amplitude outburst at 2 Jy, which subsequently peaked in 1975 at frequencies ranging from 10.6 to 2.7 GHz. [8]

A gamma-ray flare was detected from PKS 0727-11 on 21 September 2010 by Fermi Gamma-ray Space Telescope with its daily gamma-ray flux reaching levels of 1.4 ± 0.4 x 10−6 photons cm2, an increase of 3.5 in factor. [9] Increased gamma-ray flux reached around 5.0 ± -0.8 x 10−7 photons cm−2 s−1 back in January 2009. [10] The source of the quasar is mainly core-dominated with a jet shown, having either a 90° or a large bend. [11] [12]

The quasar is classified as a polarization rotator. When observed in 1981 by Hugh Aller, it is found to display a systemic time change in polarization which began in middle of 1977. Although on average with a change rate of +106°, it did not occur in linear manner according to Aller. However it is noted to occur in a series of jumps in position angles, with observed large differences of +55° in April 1978, +70° in January 1979, +82° in June 1979 and +68° by September of 1980. Aller also noted the polarization degree of PKS 0727-11 at 4.8 and 8.0 GHz frequencies, appeared fluctuated at a time-scale on the order of half-year. [13] A series of outbursts also occurred in PKS 0727-11 beginning late 1973, with a change of position angle of 90°. [8]

In February 2025, PKS 0727-11 is found to undergo a quasi-periodic oscillation with a period of 168 days. [2] [14] This is likely explained by non-ballistic helical motion in its jet, which in turn is driven by orbital motion of its binary supermassive black hole system. The mass for the primary black hole in PKS 0727-11 is estimated in the range between 3.66 x 108 and 5.79 x 109 Mʘ. [2]

References

  1. ↑ Carrasco, L.; Carramiñana, A.; Recillas, E.; Porras, A.; Valdes, J. R.; Escobedo, G.; Torres, I. (September 2010). "NIR flaring of the blazar PKSJ0730-1141". The Astronomer's Telegram. 2895: 1. Bibcode:2010ATel.2895....1C.
  2. 1 2 3 Shen, Yuncai; Yi, Tingfeng; Dhiman, Vinit; Mao, Lisheng; Dong, Liang (2025-02-10). "Multiwavelength Variability Analysis of the Blazar PKS 0727-11: An ~ 168 day Quasiperiodic Oscillation in the γ-Ray". The Astrophysical Journal. 980 (1): 153. arXiv: 2502.16110 . Bibcode:2025ApJ...980..153S. doi: 10.3847/1538-4357/ada775 . ISSN   0004-637X.
  3. ↑ Shimmins, A. J.; Clarke, Margaret E.; Ekers, R. D. (1966). "Accurate positions of 644 radio sources". Australian Journal of Physics. 19 (5): 649. Bibcode:1966AuJPh..19..649S. doi:10.1071/PH660649. ISSN   0004-9506.
  4. ↑ Robson, E. I.; Stevens, J. A.; Jenness, T. (November 2001). "Observations of flat-spectrum radio sources at λ850 μm from the James Clerk Maxwell Telescope - I. 1997 April to 2000 April". Monthly Notices of the Royal Astronomical Society. 327 (3): 751–770. Bibcode:2001MNRAS.327..751R. doi: 10.1046/j.1365-8711.2001.04729.x . ISSN   0035-8711.
  5. ↑ D'Ammando, F.; Sokolovsky, K. V. (October 2010). "Swift follow-up of the gamma-ray flaring blazar PKS 0727-11". The Astronomer's Telegram. 2901: 1. Bibcode:2010ATel.2901....1D.
  6. ↑ Abbasi, R.; Ackermann, M.; Adams, J.; Aguilar, J. A.; Ahlers, M.; Ahrens, M.; Alameddine, J. M.; Alves, A. A.; Amin, N. M.; Andeen, K.; Anderson, T.; Anton, G.; Argüelles, C.; Ashida, Y.; Athanasiadou, S. (October 2022). "Search for Astrophysical Neutrinos from 1FLE Blazars with IceCube". The Astrophysical Journal. 938 (1): 38. arXiv: 2207.04946 . Bibcode:2022ApJ...938...38A. doi: 10.3847/1538-4357/ac8de4 . ISSN   0004-637X.
  7. ↑ Macdonell, D. G.; Bridle, A. H. (November 1971). "Two Variable Radio Sources". Nature Physical Science. 234 (48): 88–90. Bibcode:1971NPhS..234...88M. doi:10.1038/physci234088a0. ISSN   2058-1106.
  8. 1 2 O'Dea, C. P.; Dent, W. A.; Balonek, T. J.; Kapitzky, J. E. (November 1983). "2.7-GHz observations of four radio polarization rotators". The Astronomical Journal. 88: 1616–1625. Bibcode:1983AJ.....88.1616O. doi:10.1086/113451. ISSN   0004-6256.
  9. ↑ D'Ammando, F. (September 2010). "Fermi LAT detection of a GeV flare from the FSRQ PKS 0727-11". The Astronomer's Telegram. 2860: 1. Bibcode:2010ATel.2860....1D.
  10. ↑ Horan, D.; Hays, E. Gurwell (January 2009). "Fermi-LAT detection of increased gamma-ray activity from the blazar PKS 0727-115". The Astronomer's Telegram. 1919: 1. Bibcode:2009ATel.1919....1H.
  11. ↑ Edwards, P. G.; Stevens, J.; Phillips, C.; Reynolds, C.; Kovalev, Y. Y.; Voitsik, P.; Sokolovsky, K.; McCallum, J.; Quick, J.; Ojha, R. (2020-01-15). "Do RadioAstron detections correlate with flaring states? An initial study of seven southern AGN" (PDF). Advances in Space Research. High-resolution space-borne radio astronomy. 65 (2): 739–744. Bibcode:2020AdSpR..65..739E. doi:10.1016/j.asr.2019.04.010. ISSN   0273-1177.
  12. ↑ Kellermann, K. I.; Vermeulen, R. C.; Zensus, J. A.; Cohen, M. H. (April 1998). "Sub-Milliarcsecond Imaging of Quasars and Active Galactic Nuclei". The Astronomical Journal. 115 (4): 1295–1318. arXiv: astro-ph/9801010 . Bibcode:1998AJ....115.1295K. doi:10.1086/300308. ISSN   0004-6256.
  13. ↑ Aller, H. D.; Hodge, P. E.; Aller, M. F. (August 1981). "Radio polarization rotators : BL Lacertae and 0727-115". The Astrophysical Journal. 248: L5 –L8. Bibcode:1981ApJ...248L...5A. doi:10.1086/183611. ISSN   0004-637X.
  14. ↑ Nowakowski, Tomasz; Phys.org. "Study investigates multiwavelength variability of blazar PKS 0727-11". phys.org. Retrieved 2025-07-05.
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