Atomic Gas in the Merging System NGC 520

Minimum credit line: Image courtesy of NRAO/AUI and J. Hibbard(for details, see Image Use Policy).

About this Image

A composite image of the optical light (green), warm gas (yellow), and cold atomic hydrogen gas (blue) in the merging system NGC 520, also known as Arp 157. NGC 520 is the galaxy near the middle, and is believed to be the result of two disk galaxies currently colliding; a galactic "train wreck". It has a nearby dwarf companion named UGC 957 (labeled in this image). The atomic hydrogen observations, taken with the VLA in its C- and D-array configurations, reveals a nearly complete gaseous ring going right through UGC 957, and astronomers are not sure how this came to be.

Investigator(s):  J. Hibbard & J. van Gorkom

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Technical Data

    Telescope VLA 
    Date of Observation 1991-05-13 
    Type of Observation Spectral Line Observations 
    Wavelength 21 cm 
    Frequency 1420.4 MHz 
    Species HI 
    Center of Image RA: 01:21:57.70, Dec: 03:33:7.00 (B1950)  
    Field of View 0.2167 x 0.2167 degrees  
    Technical Caption VLA C+D array observations with a resolution of 24". Optical image is an R-band image, and both this image and the continuum subtracted Halpha image were obtained with the KPNO 0.9m telescope.  

  • Astronomical database entries for NGC520
    • Query NED for images of NGC520
    • Query SIMBAD for more NGC520 data


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