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J/ApJ/688/1029             Magnetic field in the SMC                (Mao+, 2008)

A radio and optical polarization study of the magnetic field in the Small Magellanic Cloud. Mao S.A., Gaensler B.M., Stanimirovic S., Haverkorn M., McClure-Griffiths N.M., Staveley-Smith L., Dickey J.M. <Astrophys. J., 688, 1029-1049 (2008)> =2008ApJ...688.1029M
ADC_Keywords: Magellanic Clouds ; Magnetic fields ; Polarization ; Radio continuum Keywords: magnetic fields - polarization - Magellanic Clouds Abstract: We present a study of the magnetic field of the Small Magellanic Cloud (SMC), carried out using radio Faraday rotation and optical starlight polarization data. Consistent negative rotation measures (RMs) across the SMC indicate that the line-of-sight magnetic field is directed uniformly away from us with a strength 0.19±0.06µG. Applying the Chandrasekhar-Fermi method to starlight polarization data yields an ordered magnetic field in the plane of the sky of strength 1.6±0.4uG oriented at a position angle 4±12°, measured counterclockwise from the great circle on the sky joining the SMC to the Large Magellanic Cloud (LMC). We construct a three-dimensional magnetic field model of the SMC, under the assumption that the RMs and starlight polarization probe the same underlying large-scale field. further test the pan-Magellanic field hypothesis. Description: RM data were acquired at the Australia Telescope Compact Array (ATCA) over the period 2004 July 10-18, using the 6A array configuration spanning baselines from 336.7 to 5938.8m, with a total of 32 adjacent frequency channels each of bandwidth 4MHz centered on 1384MHz. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 45 70 Rotation measures of extragalactic sources in the observed field
See also: VII/6 : Polarization of Extragalactic Radio Sources (Eichendorf+ 1980) J/MNRAS/335/1085 : ATCA SMC Radio Continuum Source. I. (Filipovic+, 2002) J/MNRAS/355/44 : ATCA SMC Radio Continuum Source. II. (Payne+, 2004) J/ApJ/663/258 : Rotation measures of extragalactic sources in SGPS (Brown+, 2007) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID Source sequence number identification (<[MGS2008] NNN> in Simbad) (1) 4 A1 --- f_ID [*] * means source behind the SMC 6- 7 I2 h RAh Hour of right ascension (J2000) 9- 10 I2 min RAm Minute of right ascension (J2000) 12- 16 F5.2 s RAs Second of right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 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- 34 I4 rad/m2 RM Rotation measure 36- 37 I2 rad/m2 e_RM RM uncertainty 39- 42 I4 rad/m2 RM2 ? Rotation measure after foreground RM substraction (for sources behind the SMC (table 4 of the paper)) 44- 45 I2 rad/m2 e_RM2 ? RM2 uncertainty
Note (1): Missing source names are polarized sources identified by the SFIND source finding algorithm which do not correspond to real sources in Stokes I image. Objects 0198 and 0208 of table 3 are a misprint for objects 019 and 020, respectively, of table 4; corrected at CDS.
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 18-Jan-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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