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J/ApJ/702/1230        Rotation measure image of the sky          (Taylor+, 2009)

A rotation measure image of the sky. Taylor A.R., Stil J.M., Sunstrum C. <Astrophys. J., 702, 1230-1236 (2009)> =2009ApJ...702.1230T
ADC_Keywords: Radio sources ; Polarization ; Surveys ; Magnetic fields Keywords: catalogs - Galaxy: halo - magnetic fields - polarization Abstract: We have re-analyzed the NRAO VLA Sky Survey (NVSS) data to derive rotation measures (RMs) toward 37543 polarized radio sources. The resulting catalog of RM values covers the sky area north of declination -40° with an average density of more than one RM per square degree. We have identified five regions of the sky where the foreground median RM is consistently less than 1rad/m2 over several degrees. These holes in the foreground RM will be useful for future studies of possible small-scale fluctuations in cosmic magnetic field structures. In addition to allowing measurement of RMs toward polarized sources, the new analysis of the NVSS data removes the effects of bandwidth depolarization for |RM|≳100rad/m2 inherent in the original NVSS source catalog. Description: To derive RM values from the NVSS observations, we downloaded the calibrated NVSS visibility data sets for each snap shot from the National Radio Astronomy Observatory data server and created mosaic images in Stokes I, Q, and U in each of the two bands. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 105 37543 NVSS rotation measure catalog
See also: VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) VII/6 : Polarization of Extragalactic Radio Sources (Eichendorf+ 1980) J/MNRAS/386/1881 : New pulsar rotation measures (Noutsos+, 2008) J/ApJ/663/258 : Rotation measures of extragalactic sources in SGPS (Brown+, 2007) J/ApJ/642/868 : Rotation measures for 223 pulsars (Han+, 2006) J/ApJS/45/97 : Extragal. Radio Sources Faraday Rotation (Simard-Normandin+ 1981) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of Right Ascension (J2000) 4- 5 I2 min RAm Minute of Right Ascension (J2000) 7- 11 F5.2 s RAs Second of Right Ascension (J2000) 13- 16 F4.2 s e_RAs 1-σ error in Right Ascension 18 A1 --- DE- Declination sign 19- 20 I2 deg DEd Degree of Declination (J2000) 22- 23 I2 arcmin DEm Arcminute of Declination (J2000) 25- 29 F5.2 arcsec DEs Arcsecond of Declination (J2000) 31- 33 F3.1 arcsec e_DEs 1-σ error in Declination 35- 43 F9.4 deg GLON [-180,180] Galactic longitude 45- 52 F8.4 deg GLAT [-100,180] Galactic latitude 54- 60 F7.1 mJy Si NVSS integrated Stokes I flux density 62- 66 F5.1 mJy e_Si 1-σ error in Stokes I flux density 68- 74 F7.2 mJy Pk Average peak polarized intensity 76- 80 F5.2 mJy e_Pk 1-σ error in polarized intensity 82- 87 F6.2 % m Percent polarization (ratio of peak polarized intensity to peak Stokes I) 89- 93 F5.2 % e_m 1-σ error in m 95-100 F6.1 rad/m2 RM Rotation measure 102-105 F4.1 rad/m2 e_RM 1-σ error in RM
Nomenclature note: NVSS radio sources are <NVSS JHHMMSS+DDMMSS> in Simbad. History: Copied at http://www.ucalgary.ca/ras/rmcatalogue
(End) Emmanuelle Perret [CDS] 07-Oct-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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