Interacting Group Arp 313

A collection of radio and optical images of the interacting group of galaxies Arp 313, composed of the galaxies NGC 3991, NGC 3994, and NGC 3995. Clockwise (from the upper left panel) are the distribution of total atomic hydrogen (HI) shown as contours and greyscales; the velocity distribution of the HI contoured upon the total HI map; color-coded HI velocity field (red indicates gas which is moving away from us, blue gas that is moving towards us); and the total HI map contoured upon an optical image from the Digital Sky Survey. The extended distribution of the neutral hydrogen indcates that the galaxies in this group have interacted, throwing the gas which was originally within the disks of the spirals far out into intergalactic space.

Contour levels on the total HI maps are 0.24, 0.6, 1.2, 2.4, 4.8, and 9.6 x 10²⁰ cm^-2. The gray scales in the first two panels are in units of 10²⁰ cm^-2. The color-coded velocity scale in panel 3 is in units of kilometers per second.

Legacy Astronomical Images

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

Legacy Astronomical Image

Arp 313

E. M. Wilcots, M. K. Prescott

Very Large Array (VLA)

DSS

2002-00-00

spectral line

21 cm

1420.4 MHz

HI

RA 11:57:44.120, Dec: 32:17:38.300 (J2000)

0.300000 x 0.300000 degrees

Contact the archivist for a high resolution tif of this image.

Galaxies Series

Peculiar Unit