Faraday Rotation Measure Gradients from a Helical Magnetic Field in 3C273 Metadata
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Title
- Main Title Faraday Rotation Measure Gradients from a Helical Magnetic Field in 3C273
Creator
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Author: Zavala, Robert T.Creator Type: Personal
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Author: /Naval Observ., FlagstaffCreator Type: Personal
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Author: Taylor, G.B.Creator Type: Personal
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Author: /NRAO, Socorro /KIPAC, Menlo ParkCreator Type: Personal
Contributor
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Sponsor: United States. Department of Energy.Contributor Type: Organization
Publisher
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Name: Stanford Linear Accelerator CenterPlace of Publication: [Menlo Park, California]Additional Info: SLAC
Date
- Creation: 2005-06-06
Language
- English
Description
- Content Description: Using high frequency (12-22 GHz) VLBA observations we confirm the existence of a Faraday rotation measure gradient of {approx}500 rad m{sup -2} mas{sup -1} transverse to the jet axis in the quasar 3C273. The gradient is seen in two epochs spaced roughly six months apart. This stable transverse rotation measure gradient is expected if a helical magnetic field wraps around the jet. The overall order to the magnetic field in the inner projected 40 parsecs is consistent with a helical field. However, we find an unexpected increase in fractional polarization along the edges of the source, contrary to expectations. This high fractional polarization rules out internal Faraday rotation, but is not readily explained by a helical field. After correcting for the rotation measure, the intrinsic magnetic field direction in the jet of 3C273 changes from parallel to nearly perpendicular to the projected jet motion at two locations. If a helical magnetic field causes the observed rotation measure gradient then the synchrotron emitting electrons must be separate from the helical field region. The presence or absence of transverse rotation measure gradients in other sources is also discussed.
- Physical Description: 11 pages
Subject
- Keyword: Magnetic Fields
- Keyword: Synchrotrons Astrophysics,Astro
- STI Subject Categories: 43 Particle Accelerators
- Keyword: Astrophysics,Astro
- Keyword: Polarization
- Keyword: Quasars
- Keyword: Electrons
- Keyword: Rotation
- Keyword: Faraday Effect
Source
- Journal Name: Astrophys.J.626:L73-L76,2005
Collection
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Name: Office of Scientific & Technical Information Technical ReportsCode: OSTI
Institution
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Name: UNT Libraries Government Documents DepartmentCode: UNTGD
Resource Type
- Article
Format
- Text
Identifier
- Report No.: SLAC-PUB-10993
- Grant Number: AC02-76SF00515
- Office of Scientific & Technical Information Report Number: 890469
- Archival Resource Key: ark:/67531/metadc876030
Note
- Display Note: http://www.slac.stanford.edu/cgi-wrap/pubpage?slac-pub-10993.html