Astronomy:TXS 0506+056

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Short description: Blazar galaxy and source of astrophysical neutrinos
TXS 0506+056
Observation data (J2000 epoch)
ConstellationOrion
Right ascension 05h 09m 25.9645434784s[1]
Declination+05° 41′ 35.333636817″[1]
Redshift0.3365 ± 0.0010
Apparent magnitude (V)14.78
Apparent magnitude (B)14.95
Characteristics
TypeBlazar of BL Lac-type
Other designations
QSO J0509+0541, EGR J0509+0550, 2MASS J05092597+054135, VSOP J0509+0541
References: [2][3]

TXS 0506+056 is a very high energy blazar – a quasar with a relativistic jet pointing directly towards Earth – of BL Lac-type.[3] With a redshift of 0.3365 ± 0.0010,[3] it is about 1.75 gigaparsecs (5.7 billion light-years) from Earth.[4] Its approximate location on the sky is off the left shoulder of the constellation Orion.[5] Discovered as a radio source in 1983, the blazar has since been observed across the entire electromagnetic spectrum.

TXS 0506+056 is the first known source of high energy astrophysical neutrinos,[6] identified following the IceCube-170922A neutrino event[7] in an early example of multi-messenger astronomy.[8][9][10][11] The only astronomical sources previously observed by neutrino detectors were the Sun and supernova 1987A, which were detected decades earlier at much lower neutrino energies.[6]

Observational history

The object has been detected by numerous astronomical surveys, so has numerous valid source designations. The most commonly used, TXS 0506+056, comes from its inclusion in the Texas Survey of radio sources (standard abbreviation TXS) and its approximate equatorial coordinates in the B1950 equinox used by that survey.[12][13]

Location of TXS 0506+056 as observed in gamma rays (energies greater than 1 GeV) by the Fermi Gamma-ray Space Telescope[14]

TXS 0506+056 was first discovered as a radio source in 1983.[15] It was identified as an active galaxy in the 1990s, and a possible blazar in the early 2000s.[16] By 2009 it was regarded as a confirmed blazar and catalogued as a BL Lac object.[17] Gamma rays from TXS 0506+056 were detected by the EGRET and Fermi Gamma-ray Space Telescope missions.[16][18][19]

Radio observations using very-long-baseline interferometry have shown apparent superluminal motion in the blazar's jet.[20] TXS 0506+056 is one of the blazars regularly monitored by the OVRO 40 meter Telescope, so has an almost-continuous radio light curve recorded from 2008 onwards.[21]

The gamma-ray flux from TXS 0506+056 is highly variable, by at least a factor of a thousand, but on average it is in the top 4% of brightest gamma-ray sources on the sky.[6][22] It is also very bright in radio waves, in the top 1% of sources.[6] Given its distance, this makes TXS 0506+056 one of the most intrinsically powerful BL Lac objects known, particularly in high-energy gamma rays.[6][22]

Neutrino emission

On September 22, 2017, the IceCube Neutrino Observatory detected a high energy muon neutrino, dubbed IceCube-170922A.[7] The neutrino carried an energy of ~290 tera–electronvolts (TeV); for comparison, the Large Hadron Collider can generate a maximum energy of 13 TeV.[23] Within one minute of the neutrino detection, IceCube sent an automated alert to astronomers around the world with coordinates to search for a possible source.[7]

A search of this region in the sky, 1.33 degrees across, yielded only one likely source: TXS 0506+056, a previously-known blazar, which was found to be in a flaring state of high gamma ray emission.[7][6] It was subsequently observed at other wavelengths of light across the electromagnetic spectrum, including radio, infrared, optical, X-rays and gamma-rays.[7][24] The detection of both neutrinos and light from the same object was an early example of multi-messenger astronomy.[11]

A search of archived neutrino data from IceCube found evidence for an earlier flare of lower-energy neutrinos in 2014-2015 (a form of precovery), which supports identification of the blazar as a source of neutrinos.[22] An independent analysis found no gamma-ray flare during this earlier period of neutrino emission, but supported its association with the blazar.[6] The neutrinos emitted by TXS 0506+056 are six orders of magnitude higher in energy than those from any previously-identified astrophysical neutrino source.[6]

The observations of high energy neutrinos and gamma-rays from this source imply that it is also a source of cosmic rays, because all three should be produced by the same physical processes,[25] though no cosmic rays from TXS 0506+056 have been directly observed.[11] In the blazar, a charged pion was produced by the interaction of a high-energy proton or nucleus (i.e. a cosmic ray) with the radiation field or with matter.[7] The pion then decayed into a lepton and the neutrino. The neutrino interacts only weakly with matter, so it escaped the blazar.[7] Upon reaching Earth, the neutrino interacted with the Antarctic ice to produce a muon, which was observed by the Cherenkov radiation it generated as it moved through the IceCube detector.[7]

Analysis of 16 very long baseline radio array 15-GHz observations between 2009 and 2018 of TXS 0506+056 revealed the presence of a curved jet or potentially a collision of two jets, which could explain the 2014-2015 neutrino generation at the time of a low gamma-ray flux and indicate that TXS 0506+056 might be an atypical blazar.[26]

In 2020, a study using MASTER global telescope network found that TXS 0506+056 was in an 'off' state in the optical spectrum 1 minute after the alert for IceCube-170922A event and switched back on 2 hours later. This would indicate that the blazar was in a state of neutrino efficiency.[27]

See also

  • Messier 77-a second neutrino source reported by IceCube in November 2022
  • SN 1987A – a burst of neutrinos observed to come from a supernova
  • Neutrino astronomy
  • GW170817 – the first multi-messenger event involving gravitational waves; occurred five weeks before IceCube-170922A

References

  1. ↑ 1.0 1.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ "TXS 0506+056". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TXS+0506%2B056. 
  3. ↑ 3.0 3.1 3.2 Paiano, Simona; Falomo, Renato; Treves, Aldo; Scarpa, Riccardo (2018). "The Redshift of the BL Lac Object TXS 0506+056". The Astrophysical Journal 854 (2): L32. doi:10.3847/2041-8213/aaad5e. Bibcode: 2018ApJ...854L..32P. 
  4. ↑ Keivani, A.; Murase, K.; Petropoulou, M.; Fox, D. B.; Cenko, S. B.; Chaty, S.; Coleiro, A.; Delaunay, J. J. et al. (2018). "A Multimessenger Picture of the Flaring Blazar TXS 0506+056: Implications for High-energy Neutrino Emission and Cosmic-Ray Acceleration". The Astrophysical Journal 864 (1): 84. doi:10.3847/1538-4357/aad59a. Bibcode: 2018ApJ...864...84K. "given its redshift z = 0.3365 (Paiano et al. 2018) and a consensus cosmology, the luminosity distance of TXS 0506+056 is dL ≈ 1750Mpc.". 
  5. ↑ Cowen, Doug; Keivani, Azadeh; Fox, Derek (12 July 2018). "The IceCube observatory detects neutrino and discovers a blazar as its source" (in en). The Conversation. https://theconversation.com/the-icecube-observatory-detects-neutrino-and-discovers-a-blazar-as-its-source-99720. Retrieved 21 July 2018. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Padovani, P.; Giommi, P.; Resconi, E.; Glauch, T.; Arsioli, B.; Sahakyan, N.; Huber, M. (2018). "Dissecting the region around IceCube-170922A: the blazar TXS 0506+056 as the first cosmic neutrino source" (in en). Monthly Notices of the Royal Astronomical Society 480 (1): 192. doi:10.1093/mnras/sty1852. Bibcode: 2018MNRAS.480..192P. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Aartsen (12 July 2018). "Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A". Science 361 (6398): eaat1378. doi:10.1126/science.aat1378. PMID 30002226. Bibcode: 2018Sci...361.1378I. 
  8. ↑ Clery, Daniel (13 July 2018). "Ice reveals a messenger from a blazing galaxy". Science 361 (6398): 115. doi:10.1126/science.361.6398.115. https://www.science.org/content/article/ghostly-particle-caught-polar-ice-ushers-new-way-look-universe. 
  9. ↑ Siegel, Ethan. "A Cosmic First: Ultra-High Energy Neutrinos Found, From Blazing Galaxies Across The Universe" (in en). Forbes. https://www.forbes.com/sites/startswithabang/2018/07/12/a-cosmic-first-ultra-high-energy-neutrinos-found-from-blazing-galaxies-across-the-universe/. 
  10. ↑ Overbye, Dennis (12 July 2018). "It Came From a Black Hole, and Landed in Antarctica" (in en). NY Times. https://www.nytimes.com/2018/07/12/science/space-neutrinos-blazar.html. 
  11. ↑ 11.0 11.1 11.2 Castelvecchi, Davide (2018-07-12). "Single subatomic particle illuminates mysterious origins of cosmic rays" (in EN). Nature 559 (7714): 309–310. doi:10.1038/d41586-018-05703-y. ISSN 0028-0836. PMID 30018433. Bibcode: 2018Natur.559..309C. 
  12. ↑ "Details on Acronym: TXS". Centre de Données astronomiques de Strasbourg. http://cds.u-strasbg.fr/cgi-bin/Dic-Simbad?/15636609. Retrieved 17 July 2018. 
  13. ↑ Douglas, James N; Bash, Frank N; Bozyan, F. Arakel; Torrence, Geoffrey W; Wolfe, Chip (1996). "The Texas Survey of Radio Sources Covering -35.5 degrees < declination < 71.5 degrees at 365 MHz". The Astronomical Journal 111: 1945. doi:10.1086/117932. Bibcode: 1996AJ....111.1945D. 
  14. ↑ "Fermi's Five-year View of the Gamma-ray Sky". Goddard Media Studios. NASA. 21 August 2013. https://svs.gsfc.nasa.gov/11342. 
  15. ↑ Lawrence, C. R; Bennett, C. L; Garcia-Barreto, J. A; Greenfield, P. E; Burke, B. F (1983). "5 GHz observations of sources in the Arecibo 611 MHz survey". The Astrophysical Journal Supplement Series 51: 67. doi:10.1086/190840. Bibcode: 1983ApJS...51...67L. 
  16. ↑ 16.0 16.1 Halpern, J. P; Eracleous, M; Mattox, J. R (2003). "Redshifts of Candidate Gamma-Ray Blazars". The Astronomical Journal 125 (2): 572. doi:10.1086/345796. Bibcode: 2003AJ....125..572H. 
  17. ↑ Massaro, E; Giommi, P; Leto, C; Marchegiani, P; Maselli, A; Perri, M; Piranomonte, S; Sclavi, S (2009). "Roma-BZCAT: A multifrequency catalogue of blazars". Astronomy & Astrophysics 495 (2): 691. doi:10.1051/0004-6361:200810161. Bibcode: 2009A&A...495..691M. 
  18. ↑ Lamb, R. C; MacOmb, D. J (1997). "Point Sources of GeV Gamma Rays". The Astrophysical Journal 488 (2): 872. doi:10.1086/304736. Bibcode: 1997ApJ...488..872L. 
  19. ↑ Abdo, A. A; Ackermann, M; Ajello, M; Allafort, A; Antolini, E; Atwood, W. B; Axelsson, M; Baldini, L et al. (2010). "The First Catalog of Active Galactic Nuclei Detected by The Fermi Large Area Telescope". The Astrophysical Journal 715 (1): 429–457. doi:10.1088/0004-637X/715/1/429. Bibcode: 2010ApJ...715..429A. 
  20. ↑ Lister, M. L; Aller, M. F; Aller, H. D; Homan, D. C; Kellermann, K. I; Kovalev, Y. Y; Pushkarev, A. B; Richards, J. L et al. (2013). "Mojave. X. Parsec-Scale Jet Orientation Variations and Superluminal Motion in Active Galactic Nuclei". The Astronomical Journal 146 (5): 120. doi:10.1088/0004-6256/146/5/120. Bibcode: 2013AJ....146..120L. 
  21. ↑ Richards, Joseph L; Max-Moerbeck, Walter; Pavlidou, Vasiliki; King, Oliver G; Pearson, Timothy J; Readhead, Anthony C. S; Reeves, Rodrigo; Shepherd, Martin C et al. (2011). "Blazars in the Fermi era: the OVRO 40m Telescope monitoring program". The Astrophysical Journal Supplement Series 194 (2): 29. doi:10.1088/0067-0049/194/2/29. Bibcode: 2011ApJS..194...29R. 
  22. ↑ 22.0 22.1 22.2 Aartsen (12 July 2018). "Neutrino emission from the direction of the blazar TXS 0506+056 prior to the IceCube-170922A alert". Science 361 (6398): 147–151. doi:10.1126/science.aat2890. PMID 30002248. Bibcode: 2018Sci...361..147I. 
  23. ↑ Webb, Jonathan (21 May 2015). "LHC smashes collision energy record". BBC News. https://www.bbc.co.uk/news/science-environment-32809636. Retrieved 21 July 2018. 
  24. ↑ Finkbeiner, Ann (2018-04-17). "Messengers from the Sky" (in en). Scientific American 318 (5): 36–41. doi:10.1038/scientificamerican0518-36. ISSN 0036-8733. PMID 29672499. Bibcode: 2018SciAm.318e..36F. 
  25. ↑ De Angelis, Alessandro; Pimenta, Mario (2018). Introduction to particle and astroparticle physics (multimessenger astronomy and its particle physics foundations). Springer. doi:10.1007/978-3-319-78181-5. ISBN 978-3-319-78181-5. 
  26. ↑ Britzen, S.; Fendt, C.; Böttcher, M.; Zajaček, M.; Jaron, F.; Pashchenko, I. N.; Araudo, A.; Karas, V. et al. (2 October 2019). "A cosmic collider: Was the IceCube neutrino generated in a precessing jet-jet interaction in TXS 0506+056?". Astronomy & Astrophysics 630: A103. doi:10.1051/0004-6361/201935422. Bibcode: 2019A&A...630A.103B. 
  27. ↑ Lipunov, V. M.; Kornilov, V. G.; Zhirkov, K.; Gorbovskoy, E.; Budnev, N. M.; Buckley, D. A. H.; Rebolo, R.; Serra-Ricart, M. et al. (2020-06-15). "Optical Observations Reveal Strong Evidence for High-energy Neutrino Progenitor". The Astrophysical Journal 896 (2): L19. doi:10.3847/2041-8213/ab96ba. ISSN 2041-8213. Bibcode: 2020ApJ...896L..19L. 

External links

Coordinates: Sky map 05h 09m 25.96370s, +05° 41′ 35.3279″



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