Blazar in the constellation Centaurus
PKS 1424-418 is ablazar [ 1] constellation ofCentaurus . It has aredshift of 1.522[ 2] [ 3] Keith Peter Tritton who identified the object asultraviolet -excessive.[ 4] polarized with a compact radio source.[ 5] radio spectrum of this source appears flat, making it a flat-spectrum radio quasar.[ 6]
PKS 1424-418 is found optically variable on theelectromagnetic spectrum .[ 7] gamma rays .[ 8] [ 9] GeV energies. The flares have a high correlation between the energy ranges with the exception of one flare that occurred at the same time it showed low gamma activity.[ 10] MeV ) > 3 x 10−6 ph cm−2 s−1 . According toLarge Area Telescope observations, thisemission originated beyond its broad-line region.[ 11] near-infrared flare was witnessed in PKS 1424–418 in January 2018.[ 12] optical bands .[ 13]
PKS 1424-418 contains a radio structure, comprising a strong radio core and a weaker component with aposition angle of 260°.[ 5] [ 14] spectral index of -0.04.[ 5] jet is seen extending west from the core before becoming diffused.[ 15]
Between May 2009 and September 2019, the gamma ray emission from PKS 1424-418 was found to undergo aquasi-periodic oscillation with a 353-day flux oscillation period.[ 16] [ 17] significance level is also confirmed by adoptingtime domain methods.[ 18] orbital motion of abinary supermassive black hole system with the mass of a primary black hole being M ~ 3.5 x 108 - 5.5 x 109 Mʘ .[ 19]
^ Abhir, J.; Joseph, J.; Patel, S. R.; Bose, D. (2021-02-01)."Multi-frequency temporal and spectral variability study of blazar PKS 1424-418" .Monthly Notices of the Royal Astronomical Society .501 (2):2504– 2511.arXiv :2009.08220 Bibcode :2021MNRAS.501.2504A .doi :10.1093/mnras/staa3639 ISSN 0035-8711 . ^ Yang, Jianping; Cao, Gang; Zhou, Bing; Qin, Longhua (2021-01-26)."Quasi-periodic Oscillation of Blazar PKS 1424–418 in γ-Ray Band" .Publications of the Astronomical Society of the Pacific .133 (1020): 024101.Bibcode :2021PASP..133b4101Y .doi :10.1088/1538-3873/abd152 .ISSN 0004-6280 . ^ White, Graeme L.; Jauncey, David L.; Wright, Alan E.; Batty, Michael J.; Savage, Ann; Peterson, Bruce A.; Gulkis, Sam (April 1988)."Redshifts of southern radio sources. VII" .The Astrophysical Journal .327 : 561.Bibcode :1988ApJ...327..561W .doi :10.1086/166216 .ISSN 0004-637X . ^ Tritton, K. P. (1971-12-01)."Spectroscopy and Photography of Southern Hemisphere Quasar Identifications" .Monthly Notices of the Royal Astronomical Society .155 (1):1P – 2P .doi :10.1093/mnras/155.1.1p ISSN 0035-8711 . ^a b c 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. (April 1998)."A 5 GHz Southern Hemisphere VLBI Survey of Compact Radio Sources. II" .The Astronomical Journal .115 (4):1357– 1370.arXiv :astro-ph/9803104 Bibcode :1998AJ....115.1357S .doi :10.1086/300284 . ^ Ciprini, Stefano; Cutini, Sara (2013-01-01)."Swift detection of increased X-ray activity from gamma-ray flaring blazar PKS 1424-41" .The Astronomer's Telegram .4770 : 1.Bibcode :2013ATel.4770....1C . ^ Shun, Zhang; Tingfeng, Yi; Zhiyuan, Pu; Na, Wang; Zhihui, Chen; Junping, Chen; Li, Ma (2023-07-15)."Study on Optical Variability of Blazar PKS 1424-41 in Multiband" .Astronomical Techniques and Instruments .20 (4):275– 282.doi :10.14005/j.cnki.issn1672-7673.20230428.003 .ISSN 2097-3675 . ^ Verrecchia, F.; Pittori, C.; Piano, G.; Tavani, M.; Panebianco, G.; Bulgarelli, A.; Fioretti, V.; Parmiggiani, N.; Addis, A.; Baroncelli, L.; Di Piano, A.; Lucarelli, F.; Vercellone, S.; Cardillo, M.; Ursi, A. (2022-12-01)."AGILE detection of increasing gamma-ray activity of blazar PKS 1424-418" .The Astronomer's Telegram .15818 : 1.Bibcode :2022ATel15818....1V . ^ D'Ammando, F.; Orienti, M.; Longo, F.; Jankowsky, F.; Schwemmer, S.; Wagn, S. (2013-01-01)."Detection of a strong optical and gamma-ray flare from blazar PKS 1424-41" .The Astronomer's Telegram .4714 : 1.Bibcode :2013ATel.4714....1D . ^ Buson, S.; Longo, F.; Larsson, S.; Cutini, S.; Finke, J.; Ciprini, S.; Ojha, R.; D’Ammando, F.; Donato, D.; Thompson, D. J.; Desiante, R.; Bastieri, D.; Wagner, S.; Hauser, M.; Fuhrmann, L. (2014-09-01)."Unusual flaring activity in the blazar PKS 1424−418 during 2008−2011" .Astronomy & Astrophysics .569 : A40.arXiv :1407.0299 Bibcode :2014A&A...569A..40B .doi :10.1051/0004-6361/201423367 .ISSN 0004-6361 . ^ Tavecchio, F.; Pacciani, L.; Donnarumma, I.; Stamerra, A.; Isler, J.; MacPherson, E.; Urry, C. M. (2013-07-22)."The far emission region of the γ-ray blazar PKS B1424–418" .Monthly Notices of the Royal Astronomical Society: Letters .435 (1):L24 – L28 .arXiv :1306.0734 doi :10.1093/mnrasl/slt087 ISSN 1745-3933 . ^ Nesci, R.; Ojha, R.; Kadler, M. (2018-01-01)."Exceptional NIR flare in gamma-ray loud FSRQ PKS B1424-418" .The Astronomer's Telegram .11235 : 1.Bibcode :2018ATel11235....1N . ^ Kadler, Matthias; Stevens, Jamie; Ojha, Roopesh; Edwards, Philip G.; Roesch, Florian (2022-08-01)."ATCA finds a long-term radio outburst of PKS1424-418 coincident with optical/gamma-ray flaring activity" .The Astronomer's Telegram .15536 : 1.Bibcode :2022ATel15536....1K . ^ Dodson, R.; Fomalont, E. B.; Wiik, K.; Horiuchi, S.; Hirabayashi, H.; Edwards, P. G.; Murata, Y.; Asaki, Y.; Moellenbrock, G. A.; Scott, W. K.; Taylor, A. R.; Gurvits, L. I.; Paragi, Z.; Frey, S.; Shen, Z.-Q. (April 2008)."The VSOP 5 GHz Active Galactic Nucleus Survey. V. 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(January 2005)."AChandra Survey of Quasar Jets: First Results" .The Astrophysical Journal Supplement Series .156 (1):13– 33.arXiv :astro-ph/0409566 Bibcode :2005ApJS..156...13M .doi :10.1086/425578 .ISSN 0067-0049 . ^ Bhatta, Gopal; Dhital, Niraj (March 2020)."The Nature of γ-Ray Variability in Blazars" .The Astrophysical Journal .891 (2): 120.arXiv :1911.08198 Bibcode :2020ApJ...891..120B .doi :10.3847/1538-4357/ab7455 ISSN 0004-637X . ^ Bhatta, Gopal; Dhital, Niraj (March 2020)."The Nature of γ-Ray Variability in Blazars" .The Astronomical Journal .891 (2): 120.arXiv :1911.08198 Bibcode :2020ApJ...891..120B .doi :10.3847/1538-4357/ab7455 ^ Chen, Junping; Yu, Jinjie; Huang, Weitian; Ding, Nan (2024-02-08)."Transient quasi-periodic oscillations in the gamma-ray light curves of bright blazars" .Monthly Notices of the Royal Astronomical Society .528 (4):6807– 6822.arXiv :2401.10658 doi :10.1093/mnras/stae416 ISSN 0035-8711 . ^ Yang, Jianping; Cao, Gang; Zhou, Bing; Qin, Longhua (2021-01-26)."Quasi-periodic Oscillation of Blazar PKS 1424–418 in γ-Ray Band" .Publications of the Astronomical Society of the Pacific .133 (1020): 024101.Bibcode :2021PASP..133b4101Y .doi :10.1088/1538-3873/abd152 .ISSN 0004-6280 .
