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PKS 0805-07

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PKS 0805-07
PKS 0805-07 captured by Pan-STARRS
Observation data (J2000.0 epoch)
ConstellationMonoceros
Right ascension08h 08m 15.54s
Declination-07d 51m 09.89s
Redshift1.837000
Heliocentric radial velocity550,719 km/s
Distance10.053 Gly (light travel time distance)
Apparent magnitude (V)0.388
Apparent magnitude (B)0.513
Surface brightness18.4
Characteristics
TypeBlazar, FSRQ
Notable featuresBlazar emitting gamma rays
Other designations
WMAP 133, TXS 0805-077, PGC 2825379, PKS B0805-077, NVSS J080815-075109, 3FGL J0808.2-0751, 4FGL J0808.2-0751, PMN J0808-0751, MRC 0805-077, 2MASSi J0808155-075109, Cul 0805-076, IRCF J080815.5-075109

PKS 0805-07 also known as PMN J0808-0751 and 4FGL J0808.2-0751, is a quasar located in the constellation of Monoceros. With a redshift of 1.83, light has taken at least 10 billion light-years to reach Earth.[1]

Characteristics[edit]

Classified a high redshift blazar,[2][3] a type of powerful radio-loud active galactic nuclei containing a relativistic jet, pointing towards the direction of Earth,[4] PKS 0805-07 shows emitted radiation, mainly detected in gamma-rays (E>~100 MeV)[5] as detected by Large Area Telescope.[6] The quasar is known to have an extreme variability across its entire electromagnetic spectrum.[7][8] Based on the strength of optical spectral lines, which the equivalent width (EW) of the spectral line is found greater or less than 5 Å, PKS 0805-07 is further classified a flat-spectrum radio quasar (FSRQ) containing strong emission-lines.[9][10][11]

Like many other FSRQs, PKS 0805-07 contains characteristics like a high bolometric luminosity,[12] and thermal activity that is related to an accretion disk in the quasar's optical and ultraviolet (UV) spectra.[13][14] It is also known to have characteristic radio polarization at 1.4 GHz, P1.4 > 1%[15] and a spinning black hole.[16]

As studied by researchers for its emission properties, PKS 0805-07 exhibits lower electron energy (γ p ≲ 1.6 × 103) compared to BL Lacertae objects (BL Lacs) with a separation of Γ = -0.127 log ly + 8.18 in γ-ray luminosity versus photon index plane with a success rate of 88.6\%.[17] It also has a stronger magnetic field (B) with smaller electron-to-magnetic energy ratio (U e/U B) than BL Lacs.[18] Moreover, PKS 0805-07 shows a core-jet morphology with at least five observing epochs at 15 GHz between January 1996, and August 2019, observed by Very Long Baseline Array.[19] The quasar also has a core-dominated source, showing asymmetric features than lobe-dominated sources, which is caused by modest relativistic motion (β ≡ 0.20) within its radio lobes.[20]

Observations[edit]

Since April 2009, PKS 0805-07 was shown to have high levels of gamma-ray activity when detected by Large Area Telescope. Amongst other quasars, PKS 0805-07 has one of the fastest superluminal motions at that time.[21]

Between 17 and 19, November 2022, an ongoing bright gamma-ray from PKS 0805-07 was observed by AGILE satellite. This source had a flux measured of F( > 100 MeV) = (2.7 +/- 0.8) x 10-6 photons/cm2/s and around 6 sigma.[22]

References[edit]

  1. ^ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-06-25.
  2. ^ Raiteri, C. M.; Ghisellini, G.; Villata, M.; de Francesco, G.; Lanteri, L.; Chiaberge, M.; Peila, A.; Antico, G. (1998-02-01). "Optical photometric monitoring of gamma -ray loud blazars. II. Observations from November 1995 to June 1996". Astronomy and Astrophysics Supplement Series. 127 (3): 445–454. Bibcode:1998A&AS..127..445R. doi:10.1051/aas:1998372. ISSN 0365-0138.
  3. ^ Prokhorov, D. A.; Moraghan, A. (November 2017). "A search for cyclical sources of gamma-ray emission on the period range from days to years in the Fermi-LAT sky". Monthly Notices of the Royal Astronomical Society. 471 (3): 3036–3042. doi:10.1093/mnras/stx1742. ISSN 0035-8711.
  4. ^ Urry, C. Megan; Padovani, Paolo (1995-09-01). "Unified Schemes for Radio-Loud Active Galactic Nuclei". Publications of the Astronomical Society of the Pacific. 107: 803. arXiv:astro-ph/9506063. Bibcode:1995PASP..107..803U. doi:10.1086/133630. ISSN 0004-6280.
  5. ^ Fossati, G.; Maraschi, L.; Celotti, A.; Comastri, A.; Ghisellini, G. (1998-09-01). "A unifying view of the spectral energy distributions of blazars". Monthly Notices of the Royal Astronomical Society. 299 (2): 433–448. arXiv:astro-ph/9804103. Bibcode:1998MNRAS.299..433F. doi:10.1046/j.1365-8711.1998.01828.x. ISSN 0035-8711.
  6. ^ La Mura, G. (2022-10-01). "Fermi-LAT detection of enhanced gamma-ray activity from the FSRQ PKS 0805-07". The Astronomer's Telegram. 15676: 1. Bibcode:2022ATel15676....1L.
  7. ^ Fromm, C. M.; Fuhrmann, L.; Perucho, M. (2015-08-01). "Multi-frequency properties of synthetic blazar radio light curves within the shock-in-jet scenario". Astronomy & Astrophysics. 580: A94. arXiv:1412.7194. Bibcode:2015A&A...580A..94F. doi:10.1051/0004-6361/201424815. ISSN 0004-6361.
  8. ^ Abrahamyan, H. V.; Mickaelian, Areg M.; Paronyan, G. M.; Mikayelyan, G. A. (2019-06-01). "Optical variability of blazars". Astronomische Nachrichten. 340 (5): 437–444. Bibcode:2019AN....340..437A. doi:10.1002/asna.201913603. ISSN 0004-6337.
  9. ^ Duncan, R. A.; White, G. L.; Wark, R.; Reynolds, J. E.; Jauncey, D. L.; Norris, R. P.; Taaffe, L. (1993-01-01). "A survey of 526 southern flat-spectrum radio sources with the Parkes-Tidbinbilla interferometer". Publications of the Astronomical Society of Australia. 10 (4): 310. Bibcode:1993PASA...10..310D. doi:10.1017/S1323358000025923. ISSN 0066-9997.
  10. ^ Mickaelian, A. M.; Abrahamyan, H. V.; Paronyan, G. M.; Mikayelyan, G. A.; Sukiasyan, A. G.; Mkrtchyan, V. K. (2024-05-01). "Classification of Flat Spectrum Radio Quasars by Optical Activity Types". Astrophysics. 67 (1): 1–8. Bibcode:2024Ap.....67....1M. doi:10.1007/s10511-024-09811-8. ISSN 0571-7256.
  11. ^ Mavrides, S.; Mutus, H. (1984-02-01). "One more sample supporting the cosmological evolution of flat-spectrum quasars". Astronomy and Astrophysics. 131: 81–86. Bibcode:1984A&A...131...81M. ISSN 0004-6361.
  12. ^ Chen, Liang (2014-06-05). "Curvature of the Spectral Energy Distributions of Blazars". The Astrophysical Journal. 788 (2): 179. arXiv:1405.1140. Bibcode:2014ApJ...788..179C. doi:10.1088/0004-637x/788/2/179. ISSN 0004-637X.
  13. ^ Smith, P. S.; Balonek, T. J.; Heckert, P. A.; Elston, R. (1986-06-01). "The Optical and Near-Infrared Polarization Properties of the OVV Quasar 3C 345". The Astrophysical Journal. 305: 484. Bibcode:1986ApJ...305..484S. doi:10.1086/164261. ISSN 0004-637X.
  14. ^ Smith, Paul S.; Elston, Richard; Berriman, Graham; Allen, Richard G.; Balonek, Thomas J. (1988-03-01). "Evidence for Accretion Disks in Highly Polarized Quasars". The Astrophysical Journal. 326: L39. Bibcode:1988ApJ...326L..39S. doi:10.1086/185119. ISSN 0004-637X.
  15. ^ Iler, Amber L.; Schachter, Jonathan F.; Birkinshaw, Mark (1997-09-01). "Radio Polarization in EGRET Blazars". The Astrophysical Journal. 486 (1): 117–125. Bibcode:1997ApJ...486..117I. doi:10.1086/304500. ISSN 0004-637X.
  16. ^ Liodakis, I. (2018-08-01). "Toy model for the acceleration of blazar jets". Astronomy and Astrophysics. 616: A93. arXiv:1804.07772. Bibcode:2018A&A...616A..93L. doi:10.1051/0004-6361/201832766. ISSN 0004-6361.
  17. ^ Chen, Liang (2018-04-01). "On the jet properties of the gamma-ray loud active galactic nuclei". The Astrophysical Journal Supplement Series. 235 (2): 39. arXiv:1803.05715. Bibcode:2018ApJS..235...39C. doi:10.3847/1538-4365/aab8fb. ISSN 0067-0049.
  18. ^ Fan, Junhui; Xiao, Hubing; Yang, Wenxin; Zhang, Lixia; Strigachev, Anton A.; Bachev, Rumen S.; Yang, Jianghe (2023-09-01). "Characterizing the Emission Region Properties of Blazars". The Astrophysical Journal Supplement Series. 268 (1): 23. arXiv:2307.07163. Bibcode:2023ApJS..268...23F. doi:10.3847/1538-4365/ace7c8. ISSN 0067-0049.
  19. ^ Zobnina, D. I.; Aller, H. D.; Aller, M. F.; Homan, D. C.; Kovalev, Y. Y.; Lister, M. L.; Pashchenko, I. N.; Pushkarev, A. B.; Savolainen, T. (2023-08-01). "MOJAVE - XXI. Decade-long linear polarization variability in AGN jets at parsec scales". Monthly Notices of the Royal Astronomical Society. 523 (3): 3615–3628. arXiv:2211.15624. Bibcode:2023MNRAS.523.3615Z. doi:10.1093/mnras/stad1481. ISSN 0035-8711.
  20. ^ Browne, I. W. A.; Perley, R. A. (1986-09-01). "Extended radio emission round core-dominated quasars - constraints onrelativistic beaming models". Monthly Notices of the Royal Astronomical Society. 222: 149–166. Bibcode:1986MNRAS.222..149B. doi:10.1093/mnras/222.1.149. ISSN 0035-8711.
  21. ^ Ciprini, S. (2009-05-01). "Fermi LAT detection of recent activity in the new gamma-ray blazar PKS 0805-07". The Astronomer's Telegram. 2048: 1.
  22. ^ Bulgarelli, A.; Di Piano, A.; Pittori, C.; Piano, G.; Panebianco, G.; Verrecchia, F.; Tavani, M.; Fioretti, V.; Parmiggiani, N.; Addis, A.; Baroncelli, L.; Di Piano, A.; Lucarelli, F.; Vercellone, S.; Cardillo, M. (2022-11-01). "Ongoing gamma-ray flare from the PKS 0805-07 detected by AGILE". The Astronomer's Telegram. 15768: 1.
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