Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Timothy V. Cawthorne"'
Publikováno v:
Galaxies, Vol 6, Iss 2, p 53 (2018)
Astrophysical jets launched from active galactic nuclei can remain tightly collimated over large distances due, in part, to recollimation shocks. Formed within the jets due to their supersonic nature, recollimation shocks are predicted to leave signa
Externí odkaz:
https://doaj.org/article/fbfeeb6cf47546d7b6872776e2f18e79
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 430:1504-1515
This paper describes a method of fitting total intensity and polarization profiles in very long baseline interferometry (VLBI) images of astrophysical jets to profiles predicted by a theoretical model. As an example, the method is used to fit profile
Autor:
Timothy V. Cawthorne
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 367:851-859
Simulated images of synchrotron intensity and polarization are presented for a simple, semi-dynamical model of conical shock waves in an astrophysical jet. Earlier work is extended by inclusion of a component of upstream magnetic field parallel to th
Autor:
James R. Forster, Timothy V. Cawthorne, Svetlana G. Jorstad, Paul S. Smith, Walter Kieran Gear, Matthew L. Lister, Jamie Stevens, A. M. Stirling, Alan P. Marscher, José L. Gómez, E. Ian Robson
Publikováno v:
The Astronomical Journal. 130:1418-1465
We present total and polarized intensity images of 15 active galactic nuclei obtained with the Very Long Baseline Array at 7 mm at 17 epochs from 1998 March to 2001 April. At some epochs the images are accompanied by nearly simultaneous polarization
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 354:1239-1254
We present radio images of SS 433 taken in 1987 at 1.5, 5, 8 and 15 GHz using the VLA in A configuration, and taken at four more recent epochs at 5 or 1.6 GHz using MERLIN. The extremely sensitive 5-GHz VLA image appears to be inconsistent with the b
Autor:
Svetlana G. Jorstad, Walter Kieran Gear, José-Luis Gómez, Matthew L. Lister, Alan P. Marscher, Timothy V. Cawthorne, A.M. Stirling
Publikováno v:
The Astronomical Journal. 127:3115-3120
Intensive monitoring of the innermost jet in the quasar 3C 279 at 43 GHz from 1998 March to 2001 April with the Very Long Baseline Array, in combination with previous observations, reveal (1) an increase in apparent speed from 5c to 17c and (2) a cha
Publikováno v:
New Astronomy Reviews. 47:641-644
An analysis has been made of the three-dimensional trajectories of two components in the parsec-scale jet of BL Lac, constructed using centimetre-wavelength VLBI data at multiple epochs. The 3-D trajectory of each of these components has first been r
Autor:
Svetlana G. Jorstad, Paul S. Smith, Denise C. Gabuzda, Jamie Stevens, Ivan Agudo, José L. Gómez, Timothy V. Cawthorne, A. M. Stirling, Alan P. Marscher, Walter Kieran Gear, E. I. Robson, Matthew L. Lister
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 341:405-422
We present the results of a multiwavelength campaign during which BL Lac was observed at 17 regular epochs from 1998.23 to 2001.28. We used the Very Long Baseline Array (VLBA) in an observing mode sensitive to linear polarization at wavelength 7 mm w
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 337:657-665
SS433 is a galactic X-ray binary source, variable across most wavelengths of observation. On arcsecond-scales the radio emission is composed of a bright core and the famous bipolar 'corkscrew' radio jets. A series of MERLIN observations at 5 GHz were
An earlier study of the complex jet of 3C 380 by Papageorgiou et al. revealed total intensity and polarization structure associated with a bright knot K1 about 0.7 arcsec from the core that was reminiscent of that expected for a conical shock wave. I
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f29434acab1211df1d85b15570be2f40
https://clok.uclan.ac.uk/13035/1/MNRAS-2013-Gabuzda-mnrasl_slt129.pdf
https://clok.uclan.ac.uk/13035/1/MNRAS-2013-Gabuzda-mnrasl_slt129.pdf