Astronomy:PKS 2131−021

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PKS 2131−021
PKS 2131−021 as seen with DESI Legacy Surveys
Observation data (J2000.0 epoch)
ConstellationAquarius
Right ascension 21h 34m 10.31s
Declination−01° 53′ 17.2″
Redshift1.285[1]
Helio radial velocity385,233 km/s[1]
Apparent magnitude (V)18.67[1]
Characteristics
TypeFRSQ;BLLAC, HPQ[1]
Other designations
4C −02.81, MRC 2131−021, PGC 2818139, OX −053, IRCF J213410.3−015317, 2FGL J2133.8−0154

PKS 2131−021 is a quasar and a BL Lacerate object,[2] producing an astrophysical jet.[3] lt is located in the constellation Aquarius and classified as a blazar, a type of active galactic nucleus whose relativistic jet points in the direction towards Earth.

Redshift estimation

The redshift of PKS 2131−021 is 1.285, estimating the quasar to be located about 8.5 billion light-years away.[1] For more consistency according to researchers, they applied a cosmological parameters of H0 = 71 km s−1 Mpc−1, Ωm = 0.27, ΩΛ = 0.73.[4] On this model, the comoving coordinate distance of PKS 2131−021 is 3.97 Gpc, with an angular diameter distance of 1.74 Gpc, and luminosity distance of 9.08 Gpc.[5]

Black hole observation

Observations of its radio emission spanning a 45-year duration show epochs of periodic brightness variations. These nearly sinusoidal brightness changes have been interpreted as evidence of orbital motion of a binary black hole.[5] The orbital separation of the two black holes is inferred to be 200 to 2000 AU.[6][7] The periodic variability in the light curve indicates that the pair orbit each other about every two years, at a distance so close that they will merge in about 10,000 years (as viewed from the Earth).[8]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "Your NED Search Results". https://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=64426&objname=2&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1. 
  2. ↑ Sbarufatti, B.; Treves, A.; Falomo, R.; Heidt, J.; Kotilainen, J.; Scarpa, R. (2006-07-01). "ESO Very Large Telescope Optical Spectroscopy of BL Lacertae Objects. II. New Redshifts, Featureless Objects, and Classification Assessments". The Astronomical Journal 132 (1): 1–19. doi:10.1086/503031. ISSN 0004-6256. Bibcode: 2006AJ....132....1S. https://ui.adsabs.harvard.edu/abs/2006AJ....132....1S. 
  3. ↑ Liu, F. K.; Zhang, Y. H. (2002-01-01). "A new list of extra-galactic radio jets". Astronomy and Astrophysics 381 (3): 757–760. doi:10.1051/0004-6361:20011572. ISSN 0004-6361. Bibcode: 2002A&A...381..757L. https://ui.adsabs.harvard.edu/abs/2002A&A...381..757L. 
  4. ↑ Komatsu, E.; Dunkley, J.; Nolta, M. R.; Bennett, C. L.; Gold, B.; Hinshaw, G.; Jarosik, N.; Larson, D. et al. (2009-02-01). "Five-Year Wilkinson Microwave Anisotropy Probe Observations: Cosmological Interpretation". The Astrophysical Journal Supplement Series 180 (2): 330–376. doi:10.1088/0067-0049/180/2/330. ISSN 0067-0049. Bibcode: 2009ApJS..180..330K. https://ui.adsabs.harvard.edu/abs/2009ApJS..180..330K. 
  5. ↑ 5.0 5.1 O'Neill, S. (2022). "The Unanticipated Phenomenology of the Blazar PKS 2131–021: A Unique Supermassive Black Hole Binary Candidate". The Astrophysical Journal Letters 926 (2): 2. doi:10.3847/2041-8213/ac504b. Bibcode: 2022ApJ...926L..35O. 
  6. ↑ DiCenza, Shawn (2022-03-24). "Astronomers Discover two Supermassive Black Holes Orbiting Each Other, Doomed to Collide in the Future." (in en-US). https://www.universetoday.com/155117/astronomers-discover-two-supermassive-black-holes-orbiting-each-other-doomed-to-collide-in-the-future/. 
  7. ↑ "These Two Black Hole Behemoths Will Merge in 10,000 Years" (in en-US). 2022-02-28. https://skyandtelescope.org/astronomy-news/supermassive-black-holes-tight-dance/. 
  8. ↑ "Colossal Black Holes Locked in Dance at Heart of Galaxy" (in en). 2022-02-23. https://www.caltech.edu/about/news/colossal-black-holes-locked-in-dance-at-heart-of-galaxy. 




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