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| blazar TXS 0506+056 | |
|---|---|
| Name | TXS 0506+056 |
| Type | Blazar |
| Constellation | Orion |
| Epoch | J2000 |
| Ra | 05h 09m 25.96s |
| Dec | +05° 41′ 35.2″ |
| Redshift | 0.3365 |
| Apparent mag | 15.5 |
| Other names | 3FGL J0509.5+0541, MG1 J050926+0541 |
blazar TXS 0506+056 is a radio-loud active galactic nucleus classified as a blazar, remarkable for its inferred association with a high-energy neutrino event and for intensive follow-up across the electromagnetic spectrum. It occupies a key role in multimessenger astronomy, linking facilities and collaborations seeking counterparts to particles and photons. Observations involve instruments and projects spanning radio to very-high-energy gamma rays and particle observatories.
TXS 0506+056 was cataloged in radio surveys by the Molonglo Observatory Synthesis Telescope and later in high-energy catalogs such as the Third Fermi Large Area Telescope Catalog, connecting it to programs like the Fermi Gamma-ray Space Telescope, the Very Large Array, and the Catalina Real-Time Transient Survey. Early optical identifications involved spectroscopy at observatories including the Keck Observatory, the W. M. Keck Observatory, and the Sloan Digital Sky Survey, intersecting archival work from the Two Micron All Sky Survey and the Wide-field Infrared Survey Explorer. Cross-matching procedures used data products from the National Radio Astronomy Observatory, the European Southern Observatory, and the Harvard-Smithsonian Center for Astrophysics.
Intensive campaigns targeted TXS 0506+056 with instruments such as the Fermi LAT, the Major Atmospheric Gamma Imaging Cherenkov telescopes including MAGIC and VERITAS, X-ray satellites like NASA's Neil Gehrels Swift Observatory and the Chandra X-ray Observatory, and radio arrays including the Very Long Baseline Array and the European VLBI Network. Optical follow-up came from facilities like the Gran Telescopio Canarias, the Liverpool Telescope, and observatories associated with the Las Cumbres Observatory Global Telescope Network. High-energy observations involved collaborations such as the High Energy Stereoscopic System and the IceCube Neutrino Observatory, while archival data from the Infrared Astronomical Satellite and the Planck mission provided broad spectral context.
The January 2017 detection of a ~290 TeV neutrino by the IceCube Neutrino Observatory triggered alerts circulated through the Astrophysical Multimessenger Observatory Network and the Gamma-ray Coordinates Network, prompting coordinated observations by the Fermi LAT, MAGIC, VERITAS, and Swift teams. The tentative positional and temporal association with TXS 0506+056 led to collaborative analyses involving collaborations such as ANTARES and KM3NeT, and theoretical follow-up by groups at institutions including the Max Planck Institute for Physics, the University of Maryland, and Caltech. This association catalyzed discussions at conferences like the American Astronomical Society meetings and workshops hosted by CERN, influencing strategies used by the Pierre Auger Observatory and the High Altitude Water Cherenkov Observatory for future multimessenger searches.
Studies of TXS 0506+056 invoked models of relativistic jets developed in the contexts of work by Blandford and Znajek and by Blandford and Payne, with parameters estimated using VLBI kinematics, polarization measurements from the Atacama Large Millimeter/submillimeter Array, and spectral fits utilizing codes from groups at Harvard, Princeton University, and the University of Oxford. Estimates of bulk Lorentz factor, magnetic field strength, and Doppler factor referenced simulations from the Max Planck Institute for Astrophysics, the National Radio Astronomy Observatory, and the Institute for Advanced Study. Comparisons were drawn with other blazars studied by collaborations such as MOJAVE and TANAMI, and with theoretical frameworks advanced by researchers at the University of Tokyo and the National Astronomical Observatory of Japan.
The broadband spectral energy distribution combined radio data from the Very Large Array and Effelsberg telescope with infrared measures from Spitzer and WISE, optical spectra from Keck and the Very Large Telescope, X-ray spectra from XMM-Newton and Swift, and gamma-ray points from Fermi LAT and MAGIC. Time-domain variability was characterized using light curves provided by the Catalina Surveys, ASAS-SN, and the Zwicky Transient Facility, with analysis techniques from the University of California, Berkeley, and the Flatiron Institute. Results compared flaring behavior to studies of objects in catalogs maintained by the Space Telescope Science Institute and the Centre national d'études spatiales.
Spectroscopic campaigns determined a redshift near 0.3365 using instruments at the W. M. Keck Observatory and the Very Large Telescope, situating TXS 0506+056 at cosmological distances relevant to work by the Sloan Digital Sky Survey and the Two Micron All Sky Survey. Imaging from the Hubble Space Telescope and ground-based adaptive optics systems informed constraints on the host morphology, linking to studies of host galaxies by the European Southern Observatory and the National Optical Astronomy Observatory. The redshift estimate informed comparisons with active galaxies in catalogs assembled by NASA/IPAC and the Max Planck Institute for Extraterrestrial Physics.
Interpretations of TXS 0506+056 invoked lepto-hadronic and hadronic emission models developed by research groups at the University of Amsterdam, the University of Chicago, and the University of California, Santa Cruz, and tested against particle-acceleration theories from work at the Kavli Institute for Particle Astrophysics and Cosmology and the Institute for Cosmic Ray Research. Implications for the origin of cosmic rays connected to programs at the Pierre Auger Observatory and to neutrino production studies at IceCube, ANTARES, and KM3NeT, influencing proposals at the European Southern Observatory, CERN, and national funding agencies like the National Science Foundation. Ongoing theoretical efforts involve collaborations among institutes including MIT, Stanford University, and the University of Cambridge to refine multimessenger models and observational strategies.
Category:Blazars Category:Active galactic nuclei Category:Multimessenger astronomy