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PKS 1741-03

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PKS 1741-03
The blazar PKS 1741-03.
Observation data (J2000.0 epoch)
ConstellationOphiuchus
Right ascension17h 43m 58.8561s
Declination−03° 50′ 04.617″
Redshift1.054000
Heliocentric radial velocity315,981 km/s
Distance7.726 Gly
Apparent magnitude (V)20.40
Characteristics
TypeFSRQ, HPQ, Blazar
Other designations
PKS 1741-038, OHIO T -068, LEDA 2829362, INTREF 817, QSO B1741-038, CGRaBS J1743-0350, 4FGL J1744.2-0353

PKS 1741-03 is a blazar[1] located in the constellation of Ophiuchus. This is core-dominated quasar located at a redshift of (z) 1.054, found to be highly polarized.[2] It was first discovered in 1970 as an extragalactic radio source by astronomers[3] and has a radio spectrum appearing to be flat, making it a flat-spectrum source.[4]

Description

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PKS 1741-03 is found to undergo a period of extreme scattering event (ESE).[5][6] This is a dramatic change represented in flux density of radio sources, usually showing a decreasing trend in flux with a duration period of at least several weeks to months. During its ESE period, there was an increase in its angular diameter by 0.7 milliarcsecond.[6] When observed on timescales of few months, PKS 1741-03 exhibited extreme variations at 2.7 GHz but no traces of violent outbursts in its light curve.[7] Variability was also detected in the blazar at 1.49 GHz likely caused by refractive interstellar scintillation.[8]

Radio imaging made by Very Long baseline Interferometry shows PKS 1741-03 to be a simple but compact source, comprising of two components being dominated by a central radio core. There is presence of much weaker emission located south of the core which becomes noticed at high frequencies.[9] Imaging made by Very Long Baseline Array shows PKS 1741-03 has a weak component at both epochs.[10] Other VLBI observations at 2 and 8 GHz shows a bright component and a diffused jet structure.[2]

Seven components have been discovered inside the parsec-scale jet of PKS 1741-03. Based on interferometric imaging, the jet components display superluminal motion of various speeds with ranges of between 3.5 and 6.1c. Further evidence also shows they are moving ballistically with the exception of one component displaying signs of bent trajectory.[11]

In 2022, PKS 1741-03 was found to be a candidate source of a neutrino event. IceCube Observatory located at the South Pole detected a high-energy neutrino event, designated as 220205B above 200 TeV and found it to be associated with the blazar.[12] This observation occurred while PKS 1741-03 was undergoing a powerful flare.[13]

References

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  1. ^ Myserlis, Ioannis; Agudo, Ivan; Casadio, Carolina; Thum, Clemens; Traianou, Thalia; Escudero, Juan; Kram, Joana (February 2022). "Quasi-simultaneous, full-Stokes millimeter radio observations of the blazar PKS 1741-03 with the IRAM 30m Telescope in the proximity of the neutrino event IceCube-220205B". The Astronomer's Telegram. 15222: 1.
  2. ^ a b Wajima, Kiyoaki; Lovell, James E. J.; Kobayashi, Hideyuki; Hirabayashi, Hisashi; Fujisawa, Kenta; Tsuboi, Masato (April 2000). "Two-Epoch Space VLBI Observations of the Gamma-Ray Loud Quasar PKS 1741-038". Publications of the Astronomical Society of Japan. 52: 329. doi:10.1093/pasj/52.2.329. ISSN 0004-6264.
  3. ^ Kellermann, K. I.; Clark, B. G.; Jauncey, D. L.; Cohen, M. H.; Shaffer, D. B.; Moffet, A. T.; Gulkis, S. (September 1970). "High-Resolution Observations of Compact Radio Sources at 13 Centimeters". The Astrophysical Journal. 161: 803. doi:10.1086/150584. ISSN 0004-637X.
  4. ^ Vijayanarasimha, U.; Ananthakrishnan, S.; Swarup, G. (February 1985). "Interplanetary scintillation observations of 57 flat-spectrum sourcesat 327 MHz". Monthly Notices of the Royal Astronomical Society. 212: 601–608. doi:10.1093/mnras/212.3.601. ISSN 0035-8711.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  5. ^ Fiedler, R. L.; Johnston, K. J.; Waltman, E. B.; Ghigo, F. (May 1992). "QSO 1741-038". International Astronomical Union Circular. 5527: 2. ISSN 0081-0304.
  6. ^ a b Lazio, T. Joseph W.; Fey, A. L.; Dennison, Brian; Mantovani, F.; Simonetti, J. H.; Alberdi, Antonio; Foley, A. R.; Fiedler, R.; Garrett, M. A.; Hirabayashi, Hisashi; Jauncey, D. L.; Johnston, K. J.; Marcaide, Jon; Migenes, Victor; Nicolson, G. D. (2000-05-10). "The Extreme Scattering Event toward PKS 1741−038: VLBI Images". The Astrophysical Journal. 534 (2): 706–717. doi:10.1086/308779. ISSN 0004-637X.
  7. ^ Qian, S.J.; Britzen, S.; Witzel, A.; Krichbaum, T.P.; Wegner, R.; Waltman, E. (1995). "Flux density variability of 1741-038: Refractive scintillation and intrinsic variations". Astronomy & Astrophysics. 295 (1): 47–53. Bibcode:1995A&A...295...47Q. ISSN 0004-6361.
  8. ^ Hjellming, R. M.; Narayan, Ramesh (November 1986). "Refractive Interstellar Scintillation in 1741-038". The Astrophysical Journal. 310: 768. doi:10.1086/164729. ISSN 0004-637X.
  9. ^ Fey, Alan L.; Clegg, Andrew W.; Fiedler, Ralph L. (September 1996). "VLBI Observations of Eight Extreme Scattering Event Sources: Milliarcsecond-Scale Structure". The Astrophysical Journal. 468: 543. doi:10.1086/177713. ISSN 0004-637X.
  10. ^ 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.
  11. ^ Caproni, A.; Melo, I. Tosta e; Abraham, Z.; Monteiro, H.; Roland, J. (2014-06-11). "Kinematic study of the parsec-scale jet of the quasar PKS 1741–03". Monthly Notices of the Royal Astronomical Society. 441 (1): 187–202. doi:10.1093/mnras/stu536. ISSN 0035-8711.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  12. ^ Kovalev, Y.Y.; Plavin, A.V.; Troitsky, S.V.; Kovalev, Yu. A. (2022). "The radio-bright blazar PKS 1741-03 coincident with the high energy neutrino alert IceCube-220205B". The Astronomer's Telegram.
  13. ^ Plavin, A. V.; Kovalev, Y. Y.; Kovalev, Y. A.; Troitsky, S. V. (2023-05-12), Growing evidence for high-energy neutrinos originating in radio blazars, doi:10.48550/arXiv.2211.09631, retrieved 2024-12-22
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