Atomic Gas in the Merging System NGC 520 |
 | Minimum credit line: Image courtesy of NRAO/AUI
and J. Hibbard(for details, see .
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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 This image is available in the following downloadable versions:
- 545 x 500
- 800 x 734
- 1111 x 1020
If you would like to obtain a higher resolution version of this image,
please contact .
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Telescope
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VLA
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Date of Observation
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1991-05-13
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Type of Observation
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Spectral Line Observations
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Wavelength
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21 cm
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Frequency
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1420.4 MHz
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Species
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HI
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Center of Image
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RA: 01:21:57.70, Dec: 03:33:7.00 (B1950)
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Field of View
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0.2167 x 0.2167 degrees
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Technical Caption
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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.
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