PKS 0805-07

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PKS 0805-07
Pan-STARRS image of PKS 0805-07.jpg
PKS 0805-07 captured by Pan-STARRS
Observation data (J2000.0 epoch)
Constellation Monoceros
Right ascension 08h 08m 15.54s
Declination −07° 51′ 09.89″
Redshift 1.837000
Heliocentric radial velocity 550,719 km/s
Distance 10.053 Gly (light travel time distance)
Apparent magnitude  (V)0.388
Apparent magnitude  (B)0.513
Surface brightness 18.4
Characteristics
Type Blazar, FSRQ
Notable features Blazar 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]

Contents

Characteristics

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

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]

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References

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  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. arXiv: 1707.05829 . doi: 10.1093/mnras/stx1742 . ISSN   0035-8711.
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  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.
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  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.
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  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.
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  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. Bibcode:2009ATel.2048....1C.
  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. Bibcode:2022ATel15768....1B.
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