Arp 299

Minimum credit line: Image courtesy of NRAO/AUI and Zoltan G. Levay (STScI) and Juan M. Uson (NRAO)(for details, see Image Use Policy).

About this Image

A composite image of the optical light (green and yellow) and cold atomic hydrogen gas (blue) in the peculiar galaxy Arp 299, also known as NGC 3690/IC 694. Arp 299 is the result of two spiral galaxies which are in the process of colliding and merging into a single object. The atomic hydrogen observations (shown in blue in the image), taken with the Very Large Array, reveal a tremendous HI tail extending 55,000 light years (180 kiloparsecs) from the main bodies of the merging galaxies (see also this alternative version of these same data). Curiously, the gas tail is displaced from the optical tail (green in the figure), an unexpected and presently unexplained phenomena. Investigator(s): J. Hibbard & M. Yun

Investigator(s):  J. E. Hibbard (NRAO) & M. S. Yun (U. Massachusetts)

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Technical Data

    Telescope VLA 
    Date of Observation 1995-04-18 
    Type of Observation Spectral Line Observations 
    Center of Image RA: 11:25:50.00, Dec: 58:53:28.00 (B1950)  
    Field of View 0.1450 x 0.2083 degrees  
    Technical Caption VLA C+D array observations with a resolution of 20". Optical image is a B-band image obtained with the University of Hawai'i's 88" telescope. A discussion of possible explanations for the optical/gaseous offsets can be found in Hibbard, Vacca & Yun 2000 (AJ, 119, 1130) Image composition by Zoltan G. Levay (STScI) and Juan M. Uson (NRAO)  

  • Astronomical database entries for Arp 299
    • Query NED for images of Arp 299
    • Query SIMBAD for more Arp 299 data


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