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J/ApJ/733/69              Polarized DRAO sources              (Banfield+, 2011)

Polarized radio sources: a study of luminosity, redshift, and infrared colors. Banfield J.K., George S.J., Taylor A.R., Stil J.M., Kothes R., Scott D. <Astrophys. J., 733, 69 (2011)> =2011ApJ...733...69B
ADC_Keywords: Galaxies, radio ; Galaxies, IR ; Polarization ; Radio continuum ; Redshifts ; Cross identifications Keywords: galaxies: evolution - galaxies: magnetic fields - infrared: galaxies - radio continuum: galaxies Abstract: The Dominion Radio Astrophysical Observatory Deep Field polarization study has been matched with the Spitzer Wide-Area Infrared Extragalactic Survey of the European Large Area Infrared Space Observatory Survey North 1 field. We have used Very Large Array observations with a total intensity rms of 87uJy/beam to match SWIRE counterparts to the radio sources. Infrared color analysis of our radio sample shows that the majority of polarized sources are elliptical galaxies with an embedded active galactic nucleus. Using available redshift catalogs, we found 429 radio sources of which 69 are polarized with redshifts in the range of 0.04<z<3.2. We find no correlation between redshift and percentage polarization for our sample. However, for polarized radio sources, we find a weak correlation between increasing percentage polarization and decreasing luminosity. Description: The data presented in this paper cover the European Large Area ISO Survey North 1 region (ELAIS N1; Oliver et al. 2000MNRAS.316..749O) centered on RA=16:10, DEC=54:30:36 (J2000). The 1.4GHz radio source sample used in this paper was taken from Grant et al. (2010, Cat. J/ApJ/714/1689) and was observed with the Dominion Radio Astrophysical Observatory synthesis telescope (DRAO ST). High-resolution (θ=3.9") observations of the DRAO Planck Deep Fields ELAIS N1 region were carried out with the Very Large Array (VLA) in 2007 October. The infrared and optical observations of the 8.72deg2 ELAIS N1 region were taken from the SWIRE ELAIS N1 source catalog (Surace et al. 2004, Cat. II/255). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 96 69 Polarized sources with a redshift from the DRAO deep field radio source catalog table5.dat 81 16 DRAO deep field radio sources matched to spiral galaxies in the SWIRE ELAIS N1 field with upper limits on percentage polarization ΠUL table6.dat 96 18 DRAO deep field infrared faint radio sources
See also: VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012) II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) II/290 : SWIRE Photometric Redshift Catalogue (Rowan-Robinson+, 2008) II/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) VIII/62 : The Westerbork Northern Sky Survey (Leiden, 1998) J/ApJ/714/1689 : DRAO ELAIS N1 catalog (Grant+, 2010) J/MNRAS/409/821 : Radio sources with ultrahigh polarization (Shi+, 2010) J/MNRAS/402/2792 : 1388MHz ATLBS Low-Brightness Survey (Subrahmanyan+, 2010) J/MNRAS/395/269 : ELAIS-N1 field 325MHz observations (Sirothia+, 2009) J/MNRAS/383/75 : Deep 610MHz survey of ELAIS-N1 sources (Garn+, 2008) J/MNRAS/379/1343 : IR study of UKIDSS massive supercluster (Swinbank+, 2007) J/ApJ/666/201 : Radio polarimetry of the ELAIS N1 field (Taylor+, 2007) J/AJ/132/2409 : Deep ATLAS radio observations of CDFS (Norris+, 2006) J/MNRAS/371/898 : Extragalactic 20GHz radio sources (Sadler+, 2006) J/MNRAS/358/333 : ELAIS opt. ident. at 15um+1.4GHz (Gonzalez-Solares+, 2005) J/MNRAS/343/293 : ELAIS deep X-ray survey. I. (Manners+, 2003) J/MNRAS/302/222 : ISO ELAIS 20cm VLA survey regions (Ciliegi+, 1999) Byte-by-byte Description of file: table[36].dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [DRAOJ_] 7- 25 A19 --- DRAO DRAO deep field name (; J2000) 27- 32 I6 --- SWIRE ? SWIRE number (only for table 3) 34- 39 F6.2 mJy S1.4 1.4GHz flux density (1) 41- 44 F4.2 mJy e_S1.4 S1.4 uncertainty 46- 50 F5.2 mJy P0 ? Bias-corrected polarized flux density (P_0_) (1) 52- 55 F4.2 mJy e_P0 ? P0 uncertainty 57- 61 F5.2 % Pi0 ? Percentage polarization (Pi_0_) (1) 63- 67 F5.2 % e_Pi0 ? Pi0 uncertainty 69 A1 --- l_alpha Limit flag on alpha 70- 74 F5.2 --- alpha Spectral index alpha^1420^_325_ (2) 76- 79 F4.2 --- e_alpha ? alpha uncertainty 81- 85 F5.3 --- z ? Redshift (only for table 3) 87 A1 --- r_z [a-c] Redshift reference (3) 89- 96 E8.4 W/Hz L1.4 ? 1.4GHz luminosity (only for table 3)
Note (1): The flux density and polarization information comes from the Grant et al. (2010, Cat. J/ApJ/714/1689) source catalog. Note (2): The spectral indices are calculated from the 1.4GHz and 325MHz flux density from WENSS. Note (3): Reference as follows: a = Photometric redshift from SDSS DR7 (Abazajian et al. 2009, Cat. II/294). b = Photometric redshift from Rowan-Robinson et al. (2008, Cat. II/290). c = Spectroscopic redshift from Rowan-Robinson et al. (2008, Cat. II/290) and references within.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [DRAO_J] 7- 25 A19 --- DRAO DRAO deep field name (; J2000) 27- 50 A24 --- Name Galaxy name 52- 62 A11 --- Type Galaxy morphological type 63- 66 F4.2 --- z Redshift 67 A1 --- r_z [a-c] Redshift reference (1) 69- 72 F4.2 mJy S1.4 1.4GHz flux density 74- 77 F4.2 mJy e_S1.4 S1.4 uncertainty 79 A1 --- l_PiUL Limit flag on PiUL 80- 81 I2 % PiUL Upper limits on percentage polarization (ΠUL)
Note (1): Reference as follows: a = Photometric redshift from Rowan-Robinson et al. (2008, Cat. II/290). b = Spectroscopic redshift. c = Photometric redshift from SDSS DR7 (Abazajian et al. 2009, Cat. II/294).
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 08-Nov-2012
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