ALMA Science Verification Data: Millimeter Continuum Polarimetry of the Bright Radio Quasar 3C 286
Journal
Date Issued
2016
Author(s)
Nagai, H.
•
Nakanishi, K.
•
•
Hull, C. L. H.
•
Cortes, P.
•
Moellenbrock, G.
•
Fomalont, E.
•
Asada, K.
•
Hada, K.
Abstract
We present full-polarization observations of the compact, steep-spectrum radio quasar 3C 286 made with the Atacama Large Millimeter and Submillimeter Array (ALMA) at 1.3 mm. These are the first full-polarization ALMA observations, which were obtained in the framework of Science Verification. A bright core and a south-west component are detected in the total intensity image, similar to previous centimeter images. Polarized emission is also detected toward both components. The fractional polarization of the core is about 17%; this is higher than the fractional polarization at centimeter wavelengths, suggesting that the magnetic field is even more ordered in the millimeter radio core than it is further downstream in the jet. The observed polarization position angle (or electric vector position angle (EVPA)) in the core is ∼39◦, which confirms the trend that the EVPA slowly increases from centimeter to millimeter wavelengths. With the aid of multi-frequency VLBI observations, we argue that this EVPA change is associated with the frequency-dependent core position. We also report a serendipitous detection of a sub-mJy source in the field of view, which is likely to be a submillimeter galaxy.
Volume
824
Issue
2
Start page
132
Issn Identifier
0004-637X
Ads BibCode
2016ApJ...824..132N
Rights
open.access
File(s)![Thumbnail Image]()
Loading...
Name
Nagai_2016_ApJ_824_132.pdf
Description
pdf editoriale
Size
1.84 MB
Format
Adobe PDF
Checksum (MD5)
b794b4577c279e3b7e57be26242c7abc