PKS 0805-07

Last updated
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]

Related Research Articles

<span class="mw-page-title-main">Blazar</span> Very compact quasi-stellar radio source

A blazar is an active galactic nucleus (AGN) with a relativistic jet directed very nearly towards an observer. Relativistic beaming of electromagnetic radiation from the jet makes blazars appear much brighter than they would be if the jet were pointed in a direction away from Earth. Blazars are powerful sources of emission across the electromagnetic spectrum and are observed to be sources of high-energy gamma ray photons. Blazars are highly variable sources, often undergoing rapid and dramatic fluctuations in brightness on short timescales. Some blazar jets appear to exhibit superluminal motion, another consequence of material in the jet traveling toward the observer at nearly the speed of light.

The Whole Earth Blazar Telescope (WEBT) is an international consortium of astronomers created in 1997, with the aim to study a particular category of Active Galactic Nuclei (AGN) called blazars, which are characterized by strong and fast brightness variability, on time scales down to hours or less.

<span class="mw-page-title-main">NGC 3862</span> Galaxy in the constellation Leo

NGC 3862 is an elliptical galaxy located 300 million light-years away in the constellation Leo. Discovered by astronomer William Herschel on April 27, 1785, NGC 3862 is an outlying member of the Leo Cluster.

<span class="mw-page-title-main">Georges Meylan</span> Swiss astronomer

Georges Meylan is a Swiss astronomer, born on July 31, 1950, in Lausanne, Switzerland. He was the director of the Laboratory of Astrophysics of the Swiss Federal Institute of Technology (EPFL) in Lausanne, Switzerland, and now a professor emeritus of astrophysics and cosmology at EPFL. He is still active in both research and teaching.

<span class="mw-page-title-main">NGC 708</span> Galaxy in the constellation Andromeda

NGC 708 is an elliptical galaxy located 240 million light-years away in the constellation Andromeda and was discovered by astronomer William Herschel on September 21, 1786. It is classified as a cD galaxy and is the brightest member of Abell 262. NGC 708 is a weak FR I radio galaxy and is also classified as a type 2 Seyfert galaxy.

<span class="mw-page-title-main">AP Librae</span> Active galactic nucleus in the constellation Libra

AP Librae is a BL Lacertae object located at a distance of 700 million light years in the southern constellation of Libra. In the visual band it is one of the most active blazars known. AP Lib is surrounded by an extended source with a spectrum characteristic of a red-shifted giant elliptical galaxy. The derived visual magnitude of this region is 15.0, and it follows a radially decreasing brightness that is characteristic of an elliptical. Seven fainter galaxies are visible within an angular radius of 9′, suggesting it is the brightest member of a galactic cluster.

<span class="mw-page-title-main">IRAS 09104+4109</span> Galaxy in the constellation Lynx

IRAS 09104+4109 is a galaxy located in the constellation Lynx. With a redshift of 0.440797, the light travel time for this galaxy, corresponds to 4.8 billion light-years from Earth. It is the brightest cluster galaxy in CDGS 25, also known as WHL J091345.5+405628 and a notable, unique ultraluminous infrared galaxy.

<span class="mw-page-title-main">4C +71.07</span> Quasar in the constellation Ursa Major

4C +71.07 known as S5 0836+71, is a quasar located in the constellation Ursa Major. Based on its high redshift, the object is located 10.7 billion light-years away from Earth and such, classified as a blazar with a flat-spectrum radio source and features a radio jet.

<span class="mw-page-title-main">PKS 0537-286</span> Quasar in the constellation Columba

PKS 0537-286, also known as QSO B0537-286, is a quasar located in the constellation Columba. With a redshift of 3.104, the object is located 11.4 billion light years away and belongs to the flat spectrum radio quasar blazar subclass (FSQR). It is one of the most luminous known high-redshift quasars.

<span class="mw-page-title-main">PKS 0438-436</span> Quasar in the constellation Caelum

PKS 0438-436, also known as PKS J0440-4333, is a quasar located in constellation Caelum. With a high redshift of 2.86, the object is located 11.2 billion light-years from Earth and is classified as a blazar due to its flat-spectrum radio source, (in terms of the flux density as with α < 0.5 and its optical polarization.

<span class="mw-page-title-main">PKS 2215+020</span> Quasar in the constellation Aquarius

PKS 2215+020, known as PMN J2217+0220, is a quasar located in the Aquarius constellation. Its redshift is 3.570000, meaning the object is located 11.6 billion light-years away from Earth. It is classified as a flat spectrum radio source quasar.

<span class="mw-page-title-main">PKS 2126-158</span> Quasar in the constellation Capricornus

PKS 2126-158, also known as PKS 2126-15, is a quasar located in Capricornus. It has a redshift of 3.268000, which corresponds to the distance of 11.5 billion light years. It is classified as a gigahertz peaked-spectrum quasar (GPS) with a flat-spectrum radio source and a blazar, a type of active galaxy shooting an astrophysical jet towards Earth.

<span class="mw-page-title-main">PKS 0226-559</span>

PKS 0226-559 known as PMN J0228-5546 is a quasar located in the constellation Horologium. At the redshift of 2.464, the object is roughly 10.6 billion light-years from Earth.

<span class="mw-page-title-main">PKS 0451-28</span> Quasar in the constellation Caelum

PKS 0451-28, also known as MRC 0451-282, is a quasar located in the constellation of Caelum. Its redshift is 2.55, estimating the object to be located nearly 10.8 billion light-years away from Earth.

<span class="mw-page-title-main">PKS 1345+125</span>

PKS 1345+125 known as PKS 1345+12 and 4C +12.50, is an ultraluminous infrared galaxy (ULIG) with an active galactic nucleus, located in the constellation Boötes. With a redshift of 0.121740, the galaxy is located 1.7 billion light-years from Earth.

<span class="mw-page-title-main">PKS 1144-379</span> Quasar in the constellation Centaurus

PKS 1144-379 also known as PKS B1144-379, is a quasar located in the constellation of Centaurus. At the redshift of 1.048, the object is located nearly 8 billion light-years from Earth.

<span class="mw-page-title-main">PKS 1402-012</span> Quasar in the constellation of Virgo

PKS 1402-012, also known as UM 632, is a quasar located in the constellation of Virgo. With a redshift of 2.51, the object is located 10.7 billion light-years from Earth.

<span class="mw-page-title-main">4C +03.10</span> Quasar in the constellation Orion

4C +03.10 also known as PKS 0505+03 and OG +008, is a quasar located in the constellation of Orion. At a redshift of 2.46, the object is located 10.6 billion light-years away from Earth.

<span class="mw-page-title-main">PKS 1402+044</span> Quasar in the constellation of Virgo

PKS 1402+044 is a quasar located in the constellation of Virgo. It has a redshift of 3.207, estimating the object to be located 11.3 billion light-years away from Earth.

<span class="mw-page-title-main">PG 1543+489</span> Quasar in the constellation of Boötes

PG 1543+489, also known as QSO B1544+4855 and PGC 2325245, is a quasar located in the constellation of Boötes. At the redshift of 0.399, the object is located 4.5 billion light-years away from Earth. It was first discovered in 1983, by researchers who presented 114 objects in the Palomar-Green bright quasar survey, as one of the best studied samples of active galactic nuclei (AGN).

References

  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. arXiv: 1707.05829 . 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. 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.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.