Atomic Gas in the Ring Galaxy Arp 143

Minimum credit line: Image courtesy of NRAO/AUI (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 "Ring Galaxy" Arp 143 (a.k.a. NGC 2444/5). The atomic hydrogen observations, taken with the VLA in its C and D-array configurations, shows a suprising gaseous tidal tails reaching far to the north of this galaxy, to a total distance of 175 kpc or 570,000 light years in length (for Ho=75 km/s/Mpc). There was no hint of this tidal tail in previous optical images. Deeper optical imaging may show a hint of starlight associated with the tail, but it is mostly a gaseous structure. Notice gas also associated with the classical grand-design spiral galaxy to the right

Investigator(s):  P. Appleton, F. Ghigo, J. van Gorkom, J. Schombert & C. Struck-Marcell. Image by J. Hibbard

Alternate Resolutions Help

This image is available in the following downloadable versions:If you would like to obtain a higher resolution version of this image, please contact us.

For More Information

Technical Data

    Telescope VLA 
    Date of Observation 1987-06-06 
    Type of Observation Spectral Line Observations 
    Wavelength 21 cm 
    Frequency 1420.4 MHz 
    Species HI 
    Center of Image RA: 07:46:35.20, Dec: 39:06:4.00 (J2000)  
    Field of View 0.2167 x 0.2500 degrees  
    Technical Caption VLA C+D array observations obtained by Appleton et al. (1987; see link to journal article), with a resolution of 28". Optical image is R-band image taken by J. Hibbard with the KPNO 0.9m telescope in 10/92.  

  • Astronomical database entries for Arp143
    • Query NED for images of Arp143
    • Query SIMBAD for more Arp143 data


To search the Image Gallery for other images of Arp143, click the Submit button.
Object Name Show Results As:

To search the Image Gallery for similar images, click the Submit button.
Category Sub-Category Telescope Mode Show Results As:

For more search options, please use our Advanced Search form.