Wikipedia

PKS 0458-020

PKS 0458-020 also known as PKS 0458-02, is a quasar located in the constellation of Orion. It has a redshift of (z) 2.286[1][2] and was first identified as an astronomical radio source during the radio survey conducted by Parkes Observatory in 1966.[3] Subsequently the source was shown to display optical behavior[4] before being classfied as a blazar via an optical polarimetry study in 1985.[5] This source also shows radio spectrum appearing to be flat, hence making it a flat-spectrum radio quasar (FRSQ).[6]

PKS 0458-020
The quasar/blazar PKS 0458-020.
Observation data (J2000.0 epoch)
ConstellationOrion
Right ascension05h 01m 12.809s
Declination−01° 59′ 14.256″
Redshift2.286000
Heliocentric radial velocity685,326 km/s
Distance10.447 Gly
Apparent magnitude (V)18.06
Apparent magnitude (B)19.1
Characteristics
TypeBlazar, HPQ, FRSQ
Other designations
4C -02.19, PKS 0458-02, TXS 0458-020, LEDA 2818086, DA 157, OF -098, 4FGL J0501.2-0158, S3 0458-02

Description

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PKS 0458-020 is found variable across the electromagnetic spectrum and a source of gamma ray activity.[7][8][9] It is known to show optical flares which was detected by Fermi Gamma-ray Space Telescope (Fermi LAT)[10] and by the Nordic Optical Telescope in September 2012, where it was reported to be 30 times brighter than its daily flux of (E > 100 MeV) when recorded by Fermi LAT.[11] A near infrared flare was detected in January 2015.[12]

The radio structure of PKS 0458-020 is extended across a wide scale range. Radio images of the object produced via Very Large Array (VLA), showed two unique components separated by 1.8 arcseconds with a position angle of -127°. A jet can seen heading northwest before veering southwest.[1] This jet also appears to have a sharp bend by around 60° based on 15 and 43 GHz imaging.[13][14] There is a strong compact radio core straddled by extended emission which yields a projected angular size of 3.5 arcseconds.[15] A secondary structure is located southwest from the core with a bridge-like structure almost connecting it. There is also some lobe luminosity located on the side of the counterjet with the jet's side having halo emission.[16]

The supermassive black hole in PKS 0458-020 is estimated to be 8 x 108 Mʘ based on an Ld value corresponding to the peaking of a disk spectrum with the disk luminosity being Ld ~ 2 x 1046 erg s-1.[17]

Two absorption line systems located at redshifts (z) 2.039 and (z) 2.04 were detected towards the object with the former having the largest known redshift at radio wavelengths.[18][19]

References

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  1. ^ a b Shen, Z. -Q.; Wan, T. -S.; Moran, J. M.; Jauncey, D. L.; Reynolds, J. E.; Tzioumis, A. K.; Gough, R. G.; Ferris, R. H.; Sinclair, M. W.; Jiang, D. -R.; Hong, X. -Y.; Liang, S. -G.; Costa, M. E.; Tingay, S. J.; McCulloch, P. M. (1997-11-01). "A 5-GHz Southern Hemisphere VLBI Survey of Compact Radio Sources.I." The Astronomical Journal. 114: 1999. doi:10.1086/118621. ISSN 0004-6256.
  2. ^ Sapre, A. K.; Mishra, V. D. (1985). "Redshifts of the brightest X-ray QSO's". Astrophysics and Space Science. 115 (1): 107–118. doi:10.1007/bf00653831. ISSN 0004-640X.
  3. ^ Shimmins, A.J.; Day, G.A.; Ekers, R.D.; Cole, D.J. (1966). "The Parkes Catalogue Of Radio Sources Declination Zone 0° To -20°". Australian Journal of Physics. 19 (6): 837. doi:10.1071/ph660837. ISSN 0004-9506.
  4. ^ Scott, R. L.; Leacock, R. J.; McGimsey, B. Q.; Smith, A. G.; Edwards, P. L.; Hackney, K. R.; Hackney, R. L. (1976-01-01). "Optical behavior of 64 extragalactic radio sources". The Astronomical Journal. 81: 7–19. doi:10.1086/111846. ISSN 0004-6256.
  5. ^ Impey, C. D.; Tapia, S. (October 1988). "New blazars discovered by polarimetry". The Astrophysical Journal. 333: 666. doi:10.1086/166775. ISSN 0004-637X.
  6. ^ Ciprini, Stefano; Fermi Large Area Telescope Collaboration (2015-08-01). "Fermi LAT detection of renewed GeV activity from the high redshift blazar PKS 0458-02". The Astronomer's Telegram. 7952: 1.
  7. ^ Antolini, Elisa; Buson, Sara (2014-03-01). "Fermi LAT detection of GeV flares from blazars PKS 0458-02 and B2 1144+40". The Astronomer's Telegram. 5951: 1.
  8. ^ Dinesh, Adithiya (2023-07-01). "Fermi-LAT detection of renewed gamma-ray activity from the FSRQ S3 0458-02". The Astronomer's Telegram. 16110: 1.
  9. ^ Orienti, M.; D'Ammando, F. (2012-09-01). "Fermi LAT detection of a GeV flare from the high redshift blazar PKS 0458-02". The Astronomer's Telegram. 4396: 1.
  10. ^ D'Ammando, F.; Orienti, M.; Mountford, C. J. (2012-09-01). "Swift follow-up of the flaring high-redshift blazar PKS 0458-02". The Astronomer's Telegram. 4407: 1.
  11. ^ Pursimo, Tapio; Ojha, Roopesh; Kiaeerad, Fatemeh (2012-09-01). "Optical activity of the flaring gamma-ray blazar PKS 0458-02". The Astronomer's Telegram. 4402: 1.
  12. ^ Carrasco, L.; Miramon, J.; Porras, A.; Recillas, E.; Chavushyan, V.; Carraminana, A. (2015-01-01). "A New NIR Flare of the QSO PKS0458-02". The Astronomer's Telegram. 6995: 1.
  13. ^ 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. doi:10.1086/300308. ISSN 0004-6256.
  14. ^ Jorstad, Svetlana G.; Marscher, Alan P.; Mattox, John R.; Wehrle, Ann E.; Bloom, Steven D.; Yurchenko, Alexei V. (June 2001). "Multiepoch Very Long Baseline Array Observations of EGRET‐detected Quasars and BL Lacertae Objects: Superluminal Motion of Gamma‐Ray Bright Blazars". The Astrophysical Journal Supplement Series. 134 (2): 181–240. doi:10.1086/320858. ISSN 0067-0049.
  15. ^ Barthel, Peter D.; Vestergaard, Marianne; Lonsdale, Colin J. (2000-02-01). "Radio imaging of core-dominated high redshift quasars". Astronomy and Astrophysics. 354: 7–16. doi:10.48550/arXiv.astro-ph/9911474. ISSN 0004-6361.
  16. ^ Punsly, Brian (April 1995). "The extended morphology of ultraluminous radio cores". The Astronomical Journal. 109: 1555. doi:10.1086/117385. ISSN 0004-6256.
  17. ^ Ghisellini, G.; Perri, M.; Costamante, L.; Tagliaferri, G.; Sbarrato, T.; Campitiello, S.; Madejski, G.; Tavecchio, F.; Ghirlanda, G. (July 2019). "A NuSTAR view of powerful γ-ray loud blazars". Astronomy & Astrophysics. 627: A72. doi:10.1051/0004-6361/201935750. ISSN 0004-6361.
  18. ^ Wolfe, A. M.; Briggs, F. H.; Turnshek, D. A.; Davis, M. M.; Smith, H. E.; Cohen, R. D. (July 1985). "Detection of 21 centimeter absorption at Z = 2.04 in the QSO PKS 0458-02". The Astrophysical Journal. 294: L67. doi:10.1086/184511. ISSN 0004-637X.
  19. ^ Tsuboi, Masato; Nakai, Naomasa (1991-12-01). "A Search for the CO J=1-0 Absorption Line at z=2.04 toward the QSO PKS 0458-02". Publications of the Astronomical Society of Japan. 43: L65–L68. ISSN 0004-6264.
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