Atomic Gas in the NGC 5018 Group

https://www.nrao.edu/archives/plugins/Dropbox/files/ngc5018HI.jpg

Description

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.
Radio data are VLA D-array observations at 60" resolution. HI contours start at a level of 3x10<sup>19</sup> atoms cm<sup>-2</sup>, with successive contours a factor of two higher.

Creator

Legacy Astronomical Images

Rights

NRAO/AUI/NSF does not hold full copyright for this image. Contact the archivist for details.

Type

Legacy Astronomical Image

Object Name

NGC5018

Photographer

Composite image by J. Hibbard

Investigators

P. Guhathakurta, J. van Gorkom, G. Knapp, D.W. Kim

Telescope

Very Large Array (VLA)

Observation Date

1987-05-13

Type of Observation

spectral line

Wavelength

21 cm

Frequency

1420.4 MHz

Species

HI

Center of Image

RA 13:13:5.500, Dec: -19:28:28.000 (J2000)

Field of View

0.466667 x 0.433333 degrees

Link to journal article

Series

Galaxies Series

Unit

Early-type Unit

Citation

Legacy Astronomical Images, “Atomic Gas in the NGC 5018 Group,” NRAO Archives, accessed December 7, 2021, https://www.nrao.edu/archives/items/show/33542.