Atomic Gas in the NGC 5018 Group

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About this Image

VLA atomic hydrogen observations of the NGC 5018 group. The upper panel is the optical image from the Digital Sky Survey, while the lower panel shows the same optical image to fainter light levels, with contours indicating the distribution of the cold atomic gas. NGC 5018 is classified as a normal E3 elliptical galaxy, but at fainter light levels the galaxy exhibits a peculiar morphology, with many shells, ripples and loops. The VLA spectral line observations shows gas associated with a number of spiral galaxies in the group, and a few clouds which are not apparently associated with any optically identified system. Most interestingly, there is an extended gas "bridge" of material connecting two spirals on either side of NGC 5018, and the gaseous bridge appears to bend to avoid the elliptical.

Investigator(s):  P. Guhathakurta, J. van Gorkom, G. Knapp & D.-W Kim. Composite image by J. Hibbard

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Technical Data

    Telescope VLA 
    Date of Observation 1987-05-13 
    Type of Observation Spectral Line Observations 
    Wavelength 21 cm 
    Frequency 1420.4 MHz 
    Species HI 
    Center of Image RA: 13:13:5.50, Dec: -19:28:28.00 (J2000)  
    Field of View 0.4667 x 0.4333 degrees  
    Technical Caption Radio data are VLA D-array observations at 60" resolution. HI contours start at a level of 3x1019 atoms cm-2, with successive contours a factor of two higher. Earlier versions of this data was published in Kim et al. 1988.  

  • Astronomical database entries for NGC5018
    • Query NED for images of NGC5018
    • Query SIMBAD for more NGC5018 data


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