In this image, contours showing the location of the interstellar atomic hydrogen gas are superposed on the SARA optical image of the inner part of the NGC 4410 group, including NGC 4410A, B, C, D, and F. The first contour is 2 X 10¹⁹ cm^-2; the contour interval is 10¹⁹ cm^-2. The HI beamsize is 59.4 arcsec X 54.7 arcsec.

NGC 4410A+B, D, and F are detected in HI (see Table 1). The HI in the NGC 4410A+B pair is peaked to the southeast of the NGC 4410A nucleus, near the most luminous H II region. Extending 1.7 arcmin (50 kpc) to the southeast of NGC 4410A+B is an HI tail coincident with a stellar feature, containing M(HI) = 3 X 10⁸ M(sun). The barred galaxy NGC 4410D has a 1 arcmin (28 kpc) long HI tail pointing towards NGC 4410F, with M(HI) = 2 X 10⁸ M(sun).

These data were obtained with the Very Large Array, part of the National Radio Astronomy Observatory (from Smith 2000).