PKS 2142-758

PKS 2142-758
The blazar PKS 2142-758.
Observation data (J2000.0 epoch)
ConstellationOctans
Right ascension21h 47m 12.730s[1]
Declination−75° 36′ 13.224″[1]
Redshift1.144000[1]
Heliocentric radial velocity342,963 km/s[1]
Distance8.477 Gly
Apparent magnitude (V)17.30
Apparent magnitude (B)17.79
Characteristics
TypeRLQ[1]
Other designations
PKS 2142-75, PMN J2147-7536, 2MASS J21471272-7536130, BZQ J2147-7536, LEDA 2831015, IERS B2141-758[1]

PKS 2142-758 is a blazar located in the southern constellation of Octans. Its redshift is (z) 1.144[1] and it was first discovered as a quasar candidate during the Parkes 2700 MHz survey by astronomers in 1979.[2] The radio spectrum of PKS 2141-758 is flat, making it a flat-spectrum radio quasar.[3][4][5] It displays redder-stable-when brighter (RSWB) spectral variations.[6]

Description

PKS 2142-758 is highly active on the electromagnetic spectrum. It was found to produce several significant gamma-ray flares detected through MeV and GeV energy ranges, which started on April 4, 2010.[4][7] During observations by the AGILE satellite at that time, the daily flux of the source reached 2.6 ± 0.9 10-6 photons cm-2 s-1.[7] Another flare was detected in May 20, 2014 by the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope, where the flux level reached 1.2 ± 0.3 x 10-6 photons cm-2 s-1.[8] Between December 2011 and January 2012, PKS 2142-758 was in a quiescent state with a 100 MeV to 300 GeV luminosity of 4.4 x 1048 erg s-1. This makes it one of the most luminous sources observed.[9][10]

A new flare was observed on November 7, 2014. When shown on a B-band optical curve, the flare was found to be the brightest known with a magnitude of 16.585. It lasted for 1,610 days, during which its light variation magnitude reached a peak of 1.329.[11] A study published in May 2025 also showed most of the optical outbursts in PKS 2142-758 occurred at a large distance from the torus area.[12]

The source of PKS 2142-758 is found mainly dominated by a radio core structure according to Very Long Baseline Interferometry radio imaging at first-epoch. There is a faint jet extending toward the east.[13]

A central supermassive black hole mass has been found for PKS 2142-758. Based on data observations, it is estimated at 1 billion Mʘ with total luminosity of 6.5 x 1045 erg s-1.It has an accretion disk with its inner radius being 1.5 x 1014 cm or 6 Rg and the outer radius of the disk is approximately 1 x 104 Rg.[4] The temperature of the disk is in the range of 1.3-1.4 x 104 k (± 0.04).[14]

References

  1. ^ a b c d e f g "NED search results for PKS 2142-758 (PKS 2142-75)". NASA/IPAC Extragalactic Database. Retrieved 2025-05-31.
  2. ^ Anguita, C.; Campusano, L. E.; Torres, C.; Pedreros, M. (June 1979). "Identification of radio sources in the south polar cap". The Astronomical Journal. 84: 718–724. Bibcode:1979AJ.....84..718A. doi:10.1086/112472. ISSN 0004-6256.
  3. ^ Wallace, Eric (April 2010). "Fermi LAT detection of a GeV flare from PKS 2142-75". The Astronomer's Telegram. 2539: 1. Bibcode:2010ATel.2539....1W.
  4. ^ a b c Dutka, Michael; Ojha, Roopesh; Pottschmidt, Katja; Finke, Justin; Stevens, Jamie; Blanchard, Jay; Nesci, Roberto; Edwards, Philip; Lovell, Jim (2012-06-08), Multi-wavelength Observations of PKS 2142-758 during an Active Gamma-Ray State, arXiv:1206.1782
  5. ^ Neronov, A.; Semikoz, D.; Taylor, A. M.; Vovk, Ie (2015-03-01). "Very high-energy γ-ray emission from high-redshift blazars". Astronomy & Astrophysics. 575: A21. arXiv:1207.1962. Bibcode:2015A&A...575A..21N. doi:10.1051/0004-6361/201219970. ISSN 0004-6361.
  6. ^ Zhang, Bing-Kai; Zhao, Xiao-Yun; Wu, Qi (March 2022). "Optical Spectral Variations of a Large Sample of Fermi Blazars". The Astrophysical Journal Supplement Series. 259 (2): 49. arXiv:2204.02034. Bibcode:2022ApJS..259...49Z. doi:10.3847/1538-4365/ac5a52. ISSN 0067-0049.
  7. ^ a b Verrecchia, F.; Striani, E.; Pittori, C.; Lucarelli, F.; Vercellone, S.; Tavani, M.; Bulgarelli, A.; D'Ammando, F.; Donnarumma, I.; Vittorini, V.; Del Monte, E.; Evangelista, Y.; Feroci, M.; Lazzarotto, F.; Pacciani, L. (April 2010). "AGILE detects enhanced gamma-ray emission from the blazar PKS 2142-758". The Astronomer's Telegram. 2551: 1. Bibcode:2010ATel.2551....1V.
  8. ^ Ciprini, Stefano. "Fermi LAT detection of renewed gamma-ray activity from PKS 2142-75". The Astronomer's Telegram. Retrieved 2025-05-31.
  9. ^ Dutka, Michael S.; Ojha, Roopesh; Pottschmidt, Katja; Finke, Justin D.; Stevens, Jamie; Edwards, Philip G.; Blanchard, Jay; Lovell, James E. J.; Nesci, Roberto; Kadler, Matthias; Wilms, Joern; Tosti, Gino; Pursimo, Tapio; Krauss, Felicia; Müller, Cornelia (2013-12-04). "MULTI-WAVELENGTH OBSERVATIONS OF PKS 2142–75 DURING ACTIVE AND QUIESCENT GAMMA-RAY STATES". The Astrophysical Journal. 779 (2): 174. arXiv:1311.0383. Bibcode:2013ApJ...779..174D. doi:10.1088/0004-637x/779/2/174. ISSN 0004-637X.
  10. ^ Nolan, P. L.; Abdo, A. A.; Ackermann, M.; Ajello, M.; Allafort, A.; Antolini, E.; Atwood, W. B.; Axelsson, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Belfiore, A.; Bellazzini, R. (April 2012). "Fermi Large Area Telescope Second Source Catalog". The Astrophysical Journal Supplement Series. 199 (2): 31. arXiv:1108.1435. Bibcode:2012ApJS..199...31N. doi:10.1088/0067-0049/199/2/31. ISSN 0067-0049.
  11. ^ Li, Zhou; Guangyang, Xu; Lisa, Wang; Jiufu, Chen; Xiaopan, Li (2019-03-08). "Long-time Scale Color Changes of Flat-spectrum Radio Quasars" (PDF). 2019 2nd International Conference on Computer Science and Advanced Materials (CSAM 2019).
  12. ^ Kundu, Maitreya; Bala, Arit; Barat, Saugata; Chatterjee, Ritaban (2025-05-20), "Location of a Sample of GeV and Optical Outbursts in the Jets of Blazars", Monthly Notices of the Royal Astronomical Society, 540 (2): 1379–1393, arXiv:2505.03010, Bibcode:2025MNRAS.540.1379K, doi:10.1093/mnras/staf744
  13. ^ Müller, C.; Kadler, M.; Ojha, R.; Schulz, R.; Trüstedt, J.; Edwards, P. G.; Ros, E.; Carpenter, B.; Angioni, R.; Blanchard, J.; Böck, M.; Burd, P. R.; Dörr, M.; Dutka, M. S.; Eberl, T. (2018-02-01). "TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional sources" (PDF). Astronomy & Astrophysics. 610: A1. arXiv:1709.03091. Bibcode:2018A&A...610A...1M. doi:10.1051/0004-6361/201731455. ISSN 0004-6361.
  14. ^ Rajguru, Garima; Chatterjee, Ritaban (2024-12-21). "Accretion disc–jet decomposition from the optical-near infrared monitoring of Fermi blazars". Monthly Notices of the Royal Astronomical Society. 535 (4): 3595–3610. arXiv:2412.10343. doi:10.1093/mnras/stae2608. ISSN 0035-8711.

PKS 2142-758 on SIMBAD

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