We present the results of neutral hydrogen (HI) observations of the NGC 5044 and NGC 1052 groups, as part of a GEMS (Group Evolution Multiwave-length Study) investigation into the formation and evolution of galaxies in nearby groups. Two new group members have been discovered during a wide-field Hi imaging survey conducted using the ATNF Parkes telescope. These results, as well as those from follow-up HI synthesis and optical imaging, are presented here. J1320 - 1427, a new member of the NGC 5044 group, has an HI mass of M HI = 1.05 × 10 9 M⊙ and M HI/L B = 1.65 M⊙/L⊙, with a radial velocity of v = 2750 km s -1. The optical galaxy is characterized by two regions of star formation, surrounded by an extended, diffuse halo. J0249-0806, the new member of the NGC 1052 group, has M HI =5.4 × 10 8 M⊙, M HI/L R = 1.13 M⊙/L⊙ and v = 1450 kms -1. The optical image reveals a low-surface-brightness galaxy. We interpret both of these galaxies as irregular type, with J0249 - 0806 possibly undergoing first infall into the NGC 1052 group.
- Galaxies: clusters: individual: NGC 1052
- Galaxies: clusters: individual: NGC 5044
- Radio lines: galaxies
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science