Magnetic Field Structure in the Nearby Starburst Galaxy NGC253

https://www.nrao.edu/archives/plugins/Dropbox/files/ngc253_hi.jpg

Description

Our best information about magnetic fields in other galaxies is obtained by studying the radio-wavelength synchrotron radiation emitted by cosmic-ray electrons as they move through a galaxy's magnetic field. In this image, radio data from the NRAO Very Large Array and the 100-m Effelsberg telescope are combined with a three-filter, optical wavelength image of the nearby galaxy NGC 253 (the "Silver Coin" galaxy) from the ESO Wide Field Imager. The vectors overlaid on the optical image show the orientation of the magnetic field in NGC 253, as measured by the radio data; the vector length is proportional to the polarized emission. Note that the magnetic field is detected not only in the galaxy's disk but also above and below, demonstrating the presence of a "radio halo." This may be caused by an outflow of gas from the disk into the halo.

Creator

Legacy Astronomical Images

Rights

NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.

Type

Legacy Astronomical Image

Object Name

NGC253

Investigators

Volker Heesen (AIRUB), Rainer Beck (MPIfR), Marita Krause (MPIfR), Ralf-J?rgen Dettmar (AIRUB)

Telescope

Very Large Array (VLA)

Observation Date

2004-00-00

Type of Observation

continuum

Band

C

Wavelength

6 cm

Frequency

5.0 GHz

Center of Image

RA 1:47:33.100, Dec: -25:17:18.000

Field of View

1.000000 x 1.000000 degrees

Notes

Contact the archivist for a high resolution tif of this image.

Series

Galaxies Series

Unit

Spiral Unit

Citation

Legacy Astronomical Images, “Magnetic Field Structure in the Nearby Starburst Galaxy NGC253,” NRAO Archives, accessed December 3, 2021, https://www.nrao.edu/archives/items/show/33568.