VLBI observations of 3C 279 at 230GHz

DOI

We report results from five day very long baseline interferometry (VLBI) observations of the well-known quasar 3C 279 at 1.3mm (230GHz) in 2011. The measured nonzero closure phases on triangles including stations in Arizona, California, and Hawaii indicate that the source structure is spatially resolved. We find an unusual inner jet direction at scales of ~1pc extending along the northwest-southeast direction (P.A.=127{deg}+/-3{deg}), as opposed to other (previously) reported measurements on scales of a few parsecs showing inner jet direction extending to the southwest. The 1.3mm structure corresponds closely with that observed in the central region of quasi-simultaneous super-resolution Very Long Baseline Array images at 7mm. The closure phase changed significantly on the last day when compared with the rest of observations, indicating that the inner jet structure may be variable on daily timescales. The observed new direction of the inner jet shows inconsistency with the prediction of a class of jet precession models. Our observations indicate a brightness temperature of ~8x10^10^K in the 1.3mm core, much lower than that at centimeter wavelengths. Observations with better uv coverage and sensitivity in the coming years will allow the discrimination between different structure models and will provide direct images of the inner regions of the jet with 20-30{mu}as (5-7 light months) resolution.

Identifier
DOI http://doi.org/10.26093/cds/vizier.17720013
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/772/13
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/772/13
Related Identifier https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/772/13
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/772/13
Provenance
Creator Lu R.-S.; Fish V.L.; Akiyama K.; Doeleman S.S.; Algaba J.C.; Bower G.C.,Brinkerink C.; Chamberlin R.; Crew G.; Cappallo R.J.; Dexter M.; Freund R.,Friberg P.; Gurwell M.A.; Ho P.T.P.; Honma M.; Inoue M.; Jorstad S.G.,Krichbaum T.P.; Loinard L.; MacMahon D.; Marrone D.P.; Marscher A.P.,Moran J.M.; Plambeck R.; Pradel N.; Primiani R.; Tilanus R.P.J.; Titus M.,Weintroub J.; Wright M.; Young K.H.; Ziurys L.M.
Publisher CDS
Publication Year 2015
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Galactic and extragalactic Astronomy; High Energy Astrophysics; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy