CONTINUUM HALOS IN NEARBY GALAXIES: AN EVLA SURVEY (CHANG-ES). II. FIRST RESULTS ON NGC 4631

We present the first results from the Continuum Halos in Nearby Galaxies-an EVLA Survey (CHANG-ES), a new survey of 35 edge-on galaxies to search for both in-disk and extraplanar radio continuum emission. In this paper, we outline the observations and the data reduction steps that are required for w...

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Bibliographic Details
Published in:The Astronomical journal 2012-08, Vol.144 (2), p.1-13
Main Authors: Irwin, Judith, Beck, Rainier, Benjamin, R A, Dettmar, Ralf-Jurgen, ENLISH, JAYANNE, Heald, George, Henriksen, Richard N, Johnson, Megan, Krause, Marita, Li, Jiang-Tao
Format: Article
Language:English
Subjects:
Arrays
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CALIBRATION
Continuums
COSMIC PHOTONS
FARADAY EFFECT
Galactic halos
GALAXIES
GHZ RANGE
INDEXES
MAGNETIC FIELDS
MAPPING
NOISE
Noise levels
PHOTON EMISSION
POLARIZATION
SPATIAL RESOLUTION
Spectra
STARS
X RADIATION
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Summary:We present the first results from the Continuum Halos in Nearby Galaxies-an EVLA Survey (CHANG-ES), a new survey of 35 edge-on galaxies to search for both in-disk and extraplanar radio continuum emission. In this paper, we outline the observations and the data reduction steps that are required for wide-band calibration and mapping of EVLA data, including polarization. With modest on-source observing times (30 minutes at 1.5 GHz and 75 minutes at 6 GHz for the test data), we have achieved best rms noise levels of 22 and 3.5 mu Jy beam super(-1) at 1.5 GHz and 6 GHz, respectively. We present the first 1.5 GHz spectral index map of NGC 4631 to be formed from a single wide-band observation in a single array configuration. Polarization results (uncorrected for internal Faraday rotation) are consistent with previous observations and also reveal some new features. On broad scales, we find strong support for the notion that magnetic fields constrain the X-ray-emitting hot gas.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.1088/0004-6256/144/2/44