Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources

Details Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources

2007-05-18

arxiv.org/abs/0705.2736v1

Astrophys.J.666:201-211,2007

Astronomy and Astrophysics

Astrophysics

28 pages, 8 Figures. Figures 2 and 3 as separate gif images. Accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/519786

We present deep polarimetric observations at 1420 MHz of the European Large Area ISO Survey North 1 region (ELAIS N1) as part of the Dominion Radio Astrophysical Observatory Planck Deep Fields project. By combining closely spaced aperture synthesis fields, we image a region of 7.43 square degrees to a maximum sensitivity in Stokes Q and U of 78 microJy/beam, and detect 786 compact sources in Stokes I. Of these, 83 exhibit polarized emission. We find that the differential source counts (log N - log p) for polarized sources are nearly constant down to p > 500 microJy, and that these faint polarized radio sources are more highly polarized than the strong source population. The median fractional polarization is (4.8 +/- 0.7)% for polarized sources with Stokes I flux density between 1 and 30 mJy; approximately three times larger than sources with I > 100 mJy. The majority of the polarized sources have been identified with galaxies in the Spitzer Wide Area Infrared Extragalactic Survey (SWIRE) image of ELAIS N1. Most of the galaxies occupy regions in the IRAC 5.8/3.6 micron vs. 8.0/4.5 micron color-color diagram associated with dusty AGNs, or with ellipticals with an aging stellar population. A few host galaxies have colors that suggests significant PAH emission in the near-infrared. A small fraction, 12%, of the polarized sources are not detected in the SWIRE data. None of the polarized sources in our sample appears to be associated with an actively star-forming galaxy.

Affiliated with

Also associated with

No associations

Rating

Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-439560