PKS 2149−306

PKS 2149−306
Pan-STARRS image of quasar PKS 2149−306.
Observation data (J2000.0 epoch)
ConstellationPiscis Austrinus
Right ascension21h 51m 55.52s[1]
Declination−30° 27′ 53.69″[1]
Redshift2.345000[1]
Heliocentric radial velocity703,013 km/s[1]
Distance11.1 Gly
Apparent magnitude (V)18.0
Characteristics
TypeFSRQ[1]
Other designations
6dF J2151555−302754, 2MASSI J2151555−302753, RBS 1788, NVSS J215155−302753, TXS 2149−306, RX J2151.9−3027, LEDA 2831080[1]

PKS 2149−306 is a distant blazar located in the southern constellation of Piscis Austrinus. It has a redshift of (z) 2.345[1] and it was first discovered as a strong radio source by astronomers on September 12, 1983.[2] The radio spectrum of the object is confirmed flat, making it a flat-spectrum radio quasar.[3][4]

Description

PKS 2149−306 is classified as an X-ray bright radio-loud quasar with a high luminosity value of 6 x 1047 ergs s-1.[5][6] It was displayed a powerful gamma-ray flare in January 2013. The 0.1-100 GeV energy range of the object was shown to have a measured daily peak flux of 301 ± 36 x 10-8 photons cm-2 s-1, this unit corresponding to around 1.5 ± 0.2 x 1050 erg s-1. In addition, it was shown to have both a significant change in its spectra properties, with its six hour timescale displaying flux variations.[7] The Fermi Space Telescope detected a low-activity state in PKS 2149-306 with a low flux value of 6.4 ± 0.6 x 10-8 photons cm-2 s-1, while no significant signs were detected during the observation campaign between April and May of 2009.[8][7][9]

The radio structure of PKS 2149−306 can be described as a compact non-point source without any characteristics based on radio mapping, with at least two components containing flux densities of 0.78 and 0.06 Jansky.[10][3] First epoch imaging showed there is a radio core present with a compact component located in a westerly direction, separated by 8.7 milliarcseconds.[11]

In March 2006 PKS 2149−306 was found to display multiple emission lines of various chemical elements including hydrogen-alpha and helium in its optical spectrum. One of the emission lines displayed an irregular profile, making it somehow unusual. Low atomic elements such as nitrogen, magnesium, neon and sulfur were also discovered in its X-ray spectrum.[12] A supermassive black hole mass of 3.4 x 109 Mʘ has been estimated for the quasar.[13]

References

  1. ^ a b c d e f g "NED Search results for PKS 2149-306". NASA/IPAC Extragalactic Database. Retrieved 2025-09-13.
  2. ^ Torres, C.; Wroblewski, H. (April 1987). "Precise optical positions of strong extragalactic radio sources southof del=+5 deg". Astronomy and Astrophysics Supplement Series. 69: 23–31. ISSN 0365-0138.
  3. ^ a b Bianchin, V.; Foschini, L.; Ghisellini, G.; Tagliaferri, G.; Tavecchio, F.; Treves, A.; Di Cocco, G.; Gliozzi, M.; Pian, E.; Sambruna, R. M.; Wolter, A. (March 2009). "The changing look of PKS 2149-306". Astronomy and Astrophysics. 496 (2): 423–428. arXiv:0902.1789. Bibcode:2009A&A...496..423B. doi:10.1051/0004-6361/200811128. ISSN 0004-6361.
  4. ^ Krauß, F.; Wilms, J.; Kadler, M.; Ojha, R.; Schulz, R.; Trüstedt, J.; Edwards, P. G.; Stevens, J.; Ros, E.; Baumgartner, W.; Beuchert, T.; Blanchard, J.; Buson, S.; Carpenter, B.; Dauser, T. (2016-07-01). "The TANAMI Multiwavelength Program: Dynamic spectral energy distributions of southern blazars" (PDF). Astronomy & Astrophysics. 591: A130. arXiv:1605.00841. Bibcode:2016A&A...591A.130K. doi:10.1051/0004-6361/201628595. hdl:10550/59347. ISSN 0004-6361.
  5. ^ Bhatta, Gopal; Mohorian, Maksym; Bilinsky, Illya (2018-11-01). "Hard X-ray properties of NuSTAR blazars". Astronomy & Astrophysics. 619: A93. arXiv:1710.09910. Bibcode:2018A&A...619A..93B. doi:10.1051/0004-6361/201833628. ISSN 0004-6361.
  6. ^ Yaqoob, T.; George, I. M.; Nandra, K.; Turner, T. J.; Zobair, S.; Serlemitsos, P. J. (1999-11-01). "A Highly Doppler Blueshifted F[CLC]e[/CLC]-K Emission Line in the High-Redshift QSO PKS 2149−306". The Astrophysical Journal. 525 (1): L9 – L12. doi:10.1086/312327. ISSN 0004-637X.
  7. ^ a b D'Ammando, F.; Orienti, M. (2015-11-19). "High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149−306". Monthly Notices of the Royal Astronomical Society. 455 (2): 1881–1891. doi:10.1093/mnras/stv2452. ISSN 0035-8711.
  8. ^ Monica, Orienti; Filippo, D’Ammando; Marcello, Giroletti; Justin, Finke; Daniele, Dallacasa (September 2016). "Flaring γ-Ray Emission from High Redshift Blazars". Galaxies. 4 (3). doi:10.3390/galaxie (inactive 13 September 2025). ISSN 2075-4434. Archived from the original on 2024-09-08.{{cite journal}}: CS1 maint: DOI inactive as of September 2025 (link)
  9. ^ Bianchin, V.; Foschini, L.; Grandi, P.; Malaguti, G.; Ghisellini, G.; Tavecchio, F.; Tagliaferri, G.; Gliozzi, M.; Maraschi, L.; Pian, E.; Sambruna, R. M.; Treves, A.; Wolter, A.; Di Cocco, G. (October 2010). "Monitoring the High-z Flat Spectrum Radio Quasar PKS 2149-306: Recent Observations with INTEGRAL and Swift". Accretion and Ejection in AGN: A Global View. 427: 189–190. Bibcode:2010ASPC..427..189B. ISSN 1050-3390.
  10. ^ Ojha, Roopesh; Fey, Alan L.; Charlot, Patrick; Jauncey, David L.; Johnston, Kenneth J.; Reynolds, John E.; Tzioumis, Anastasios K.; Quick, Jonathan F. H.; Nicolson, George D.; Ellingsen, Simon P.; McCulloch, Peter M.; Koyama, Yasuhiro (December 2005). "VLBI Observations of Southern Hemisphere ICRF Sources. II. Astrometric Suitability Based on Intrinsic Structure". The Astronomical Journal. 130 (6): 2529–2540. Bibcode:2005AJ....130.2529O. doi:10.1086/497592. ISSN 0004-6256.
  11. ^ Ojha, R.; Kadler, M.; Böck, M.; Booth, R.; Dutka, M. S.; Edwards, P. G.; Fey, A. L.; Fuhrmann, L.; Gaume, R. A.; Hase, H.; Horiuchi, S.; Jauncey, D. L.; Johnston, K. J.; Katz, U.; Lister, M. (2010-09-01). "TANAMI: tracking active galactic nuclei with austral milliarcsecond interferometry - I. First-epoch 8.4 GHz images" (PDF). Astronomy & Astrophysics. 519: A45. arXiv:1005.4432. Bibcode:2010A&A...519A..45O. doi:10.1051/0004-6361/200912724. ISSN 0004-6361.
  12. ^ Basu, D. (March 2006). "PKS 2149-306 and CXOCDFS J033225.3-274219: Two AGNs with Unusual Spectra Possibly Blueshifted?". The Astronomical Journal. 131 (3): 1231–1235. Bibcode:2006AJ....131.1231B. doi:10.1086/499943. ISSN 0004-6256.
  13. ^ Wang, Jian-Min; Yuan, Ye-Fei; Wu, Mei; Kusunose, Masaaki (2000-08-08), "Blob Ejection from Advection-dominated Accretion Flow: Observational Consequences", The Astrophysical Journal, 541 (2): L41 – L44, arXiv:astro-ph/0008103, Bibcode:2000ApJ...541L..41W, doi:10.1086/312896, arXiv:astro-ph/0008103
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