PKS 2142-758

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PKS 2142-758
DSS image of PKS 2142-758.jpg
The blazar PKS 2142-758.
Observation data (J2000.0 epoch)
Constellation Octans
Right ascension 21h 47m 12.730s [1]
Declination −75° 36′ 13.224″ [1]
Redshift 1.144000 [1]
Heliocentric radial velocity 342,963 km/s [1]
Distance 8.477 Gly
Apparent magnitude  (V)17.30
Apparent magnitude  (B)17.79
Characteristics
Type RLQ [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]

Contents

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 to have a mass of 1 x 109 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. 1 2 3 4 5 6 7 "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. 1 2 3 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. 1 2 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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