A transition from parabolic to conical shape as a common effect in nearby AGN jets
Yuri Y. Kovalev,Yuri Y. Kovalev,Yuri Y. Kovalev,Alexander B. Pushkarev,E. E. Nokhrina,A. V. Plavin,A. V. Plavin,V. S. Beskin,V. S. Beskin,A. V. Chernoglazov,A. V. Chernoglazov,Matthew L. Lister,Tuomas Savolainen,Tuomas Savolainen +13 more
Reads0
Chats0
TLDR
In this article, the authors performed an automated search for jet shape transitions in a sample of 367 active galactic nuclei (AGN) using VLBA data at 15 GHz and 1.4 GHz with a transition from a parabolic to conical shape, while the full analyzed sample is dominated by distant AGN with a typical z about 1.07.Abstract:
Observational studies of collimation in jets in active galactic nuclei (AGN) are a key to understanding their formation and acceleration processes. We have performed an automated search for jet shape transitions in a sample of 367 AGN using VLBA data at 15 GHz and 1.4 GHz. This search has found ten out of 29 nearby jets at redshifts z<0.07 with a transition from a parabolic to conical shape, while the full analyzed sample is dominated by distant AGN with a typical z about 1. The ten AGN are UGC00773, NGC1052, 3C111, 3C120, TXS0815-094, Mrk180, PKS1514+00, NGC6251, 3C371, and BL Lac. We conclude that the geometry transition may be a common effect in AGN jets. It can be observed only when sufficient linear resolution is obtained. Supplementing these results with previously reported shape breaks in the nearby AGN 1H0323+342 and M87, we estimate that the break occurs at 10^5-10^6 gravitational radii from the nucleus. We suggest that the jet shape transition happens when the bulk plasma kinetic energy flux becomes equal to the Poynting energy flux, while the ambient medium pressure is assumed to be governed by Bondi accretion. In general, the break point may not coincide with the Bondi radius. The observational data supports our model predictions on the jet acceleration and properties of the break point.read more
Citations
More filters
CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates
S. E. Healey,Roger W. Romani,Garret Cotter,Peter F. Michelson,Edward F. Schlafly,Anthony C. S. Readhead,Paolo Giommi,Sylvain Chaty,Isabelle Grenier,L. Weintraub +9 more
TL;DR: In this article, a uniform all-sky survey of bright blazars, selected primarily by their flat radio spectra, was designed to provide a large catalog of likely γ-ray active galactic nuclei (AGNs).
Journal ArticleDOI
Directional association of TeV to PeV astrophysical neutrinos with radio blazars
TL;DR: In this article, the neutrinos above 200 TeV detected by IceCube are produced within several parsecs in the central regions of radio-bright blazars, that is active galactic nuclei with jets pointing towards us.
Journal ArticleDOI
Observational Evidence for the Origin of High-energy Neutrinos in Parsec-scale Nuclei of Radio-bright Active Galaxies
A. V. Plavin,A. V. Plavin,Yuri Y. Kovalev,Yuri Y. Kovalev,Yuri Y. Kovalev,Yuri Kovalev,Sergey Troitsky +6 more
TL;DR: In this paper, the authors used radio very long baseline interferometry (VLBI) data for a complete VLBI flux density-limited sample of active galactic nuclei (AGNs) to address the problem of the origin of astrophysical neutrinos with energies above 200 TeV.
Journal ArticleDOI
OUP accepted manuscript
TL;DR: In this article , the results of nine simulations of radiatively-inefficient magnetically arrested disks (MADs) across different values of the black hole spin parameter $a_*$ were presented.
Journal ArticleDOI
M87 black hole mass and spin estimate through the position of the jet boundary shape break
E. E. Nokhrina,Leonid I. Gurvits,Leonid I. Gurvits,V. S. Beskin,V. S. Beskin,Masanori Nakamura,Keiichi Asada,Kazuhiro Hada +7 more
TL;DR: In this article, the authors proposed a new method of estimating the mass of a supermassive black hole residing in the centre of an active galaxy by coupling the unique set of observations available for the jet kinematics, environment and boundary profile with their MHD modelling under assumption on the presence of a dynamically important magnetic field in the M87 jet.
References
More filters
Journal ArticleDOI
Five-year wilkinson microwave anisotropy probe observations: cosmological interpretation
Eiichiro Komatsu,Jo Dunkley,Jo Dunkley,M. R. Nolta,Charles L. Bennett,B. Gold,Gary Hinshaw,N. Jarosik,Davin Larson,Michele Limon,Lyman A. Page,David N. Spergel,Mark Halpern,Robert S. Hill,Alan J. Kogut,S. S. Meyer,Gregory S. Tucker,Janet Weiland,Edward J. Wollack,Edward L. Wright +19 more
TL;DR: In this article, the Wilkinson Microwave Anisotropy Probe (WMAP) 5-year data were used to constrain the physics of cosmic inflation via Gaussianity, adiabaticity, the power spectrum of primordial fluctuations, gravitational waves, and spatial curvature.
Journal ArticleDOI
Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
Eiichiro Komatsu,Jo Dunkley,M. R. Nolta,Charles L. Bennett,B. Gold,Gary Hinshaw,Norman Jarosik,David L. Larson,Michele Limon,L. Page,David N. Spergel,Mark Halpern,Robert S. Hill,A. Kogut,S. S. Meyer,G. S. Tucker,Janet Weiland,Edward J. Wollack,Edward L. Wright +18 more
TL;DR: In this paper, the authors show that the tensor-to-scalar ratio r 1 is disfavored regardless of r. They provide a set of "WMAP distance priors, to test a variety of dark energy models.
Journal ArticleDOI
Electromagnetic extraction of energy from Kerr black holes
R. D. Blandford,R. L. Znajek +1 more
Journal ArticleDOI
Relativistic jets as compact radio sources
Roger Blandford,A. Konigl +1 more
TL;DR: In this article, the relativistic motion of a quasi-steady jet is modeled as a superluminal expansion in which the moving component and the stationary component would have comparable Doppler-boosted fluxes, and specific models for the dynamical and radiative properties of the jet and individual shocks are presented.
Journal ArticleDOI
The Sixth Data Release of the Sloan Digital Sky Survey
Jennifer K. Adelman-McCarthy,Marcel A. Agüeros,S. Allam,S. Allam,Carlos Allende Prieto,K. S. J. Anderson,Scott F. Anderson,James Annis,Neta A. Bahcall,Coryn A. L. Bailer-Jones,Ivan K. Baldry,Ivan K. Baldry,John C. Barentine,Bruce A. Bassett,Andrew C. Becker,Timothy C. Beers,Eric F. Bell,Andreas A. Berlind,Mariangela Bernardi,Michael R. Blanton,John J. Bochanski,William N. Boroski,Jarle Brinchmann,J. Brinkmann,Robert J. Brunner,Tamás Budavári,Samuel Carliles,Michael A. Carr,Francisco J. Castander,D. Cinabro,Richard J. Cool,Kevin R. Covey,István Csabai,István Csabai,Carlos E. Cunha,James R. A. Davenport,Ben Dilday,Mamoru Doi,Daniel J. Eisenstein,Michael L. Evans,Xiaohui Fan,Douglas P. Finkbeiner,Scott D. Friedman,Joshua A. Frieman,Joshua A. Frieman,Masataka Fukugita,Boris T. Gänsicke,Evalyn Gates,Bruce Gillespie,Karl Glazebrook,Jim Gray,Eva K. Grebel,Eva K. Grebel,James E. Gunn,Vijay K. Gurbani,Vijay K. Gurbani,Patrick B. Hall,Paul Harding,Michael Harvanek,Suzanne L. Hawley,Jeffrey J. E. Hayes,Timothy M. Heckman,John S. Hendry,Robert B. Hindsley,Christopher M. Hirata,Craig J. Hogan,David W. Hogg,J. B. Hyde,Shin-Ichi Ichikawa,Željko Ivezić,Sebastian Jester,Jennifer A. Johnson,Anders M. Jorgensen,Mario Juric,Stephen M. Kent,Richard Kessler,S. J. Kleinman,Gillian R. Knapp,Richard G. Kron,Richard G. Kron,Jurek Krzesinski,Jurek Krzesinski,Nikolay Kuropatkin,D. Q. Lamb,Hubert Lampeitl,Svetlana Lebedeva,Young Sun Lee,R. French Leger,Sébastien Lépine,Marcos Lima,Huan Lin,Dan Long,Craig P. Loomis,Jon Loveday,Robert H. Lupton,Olena Malanushenko,Viktor Malanushenko,Rachel Mandelbaum,Bruce Margon,John Marriner,David Martinez-Delgado,Takahiko Matsubara,P. M. McGehee,Timothy A. McKay,Avery Meiksin,Heather L. Morrison,Jeffrey A. Munn,Reiko Nakajima,Eric H. Neilsen,Heidi Jo Newberg,Robert C. Nichol,T. Nicinski,Maria Nieto-Santisteban,Atsuko Nitta,Sadanori Okamura,Russell Owen,Hiroaki Oyaizu,Nikhil Padmanabhan,Kaike Pan,Changbom Park,John Peoples,Jeffrey R. Pier,Adrian Pope,Norbert Purger,M. Jordan Raddick,Paola Re Fiorentin,Gordon T. Richards,Michael Richmond,Adam G. Riess,Hans-Walter Rix,Constance M. Rockosi,Masao Sako,Masao Sako,David J. Schlegel,Donald P. Schneider,Matthias R. Schreiber,Axel Schwope,Uroš Seljak,Uroš Seljak,Branimir Sesar,Erin Sheldon,K. Shimasaku,Thirupathi Sivarani,J. Allyn Smith,Stephanie A. Snedden,Matthias Steinmetz,Michael A. Strauss,Mark SubbaRao,Mark SubbaRao,Yasushi Suto,Alexander S. Szalay,István Szapudi,Paula Szkody,Max Tegmark,Aniruddha R. Thakar,Christy A. Tremonti,Douglas L. Tucker,A. Uomoto,Daniel E. Vanden Berk,Jan Vandenberg,S. Vidrih,Michael S. Vogeley,Wolfgang Voges,Nicole P. Vogt,Yogesh Wadadekar,David H. Weinberg,Andrew A. West,Simon D. M. White,Brian C. Wilhite,Brian Yanny,D. R. Yocum,Donald G. York,Idit Zehavi,Daniel B. Zucker +173 more
TL;DR: The Sixth Data Release of the Sloan Digital Sky Survey (SDS) as discussed by the authors contains images and parameters of roughly 287 million objects over 9583 deg(2), including scans over a large range of Galactic latitudes and longitudes.