We present the results of neutral hydrogen ( Hi ) observations of the NGC 5044 and NGC 1052 groups , as part of a GEMS ( Group Evolution Multiwavelength 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 followup Hi synthesis and optical imaging , are presented here .
J 1320 - 1427 , a new member of the NGC 5044 Group , has an Hi mass of \mathrm { M _ { \mbox { \scriptsize { { \sc { Hi } } } } } } = \nolinebreak [ 4 ] 1.05 \times 10 ^ { 9 } % \mbox { M$ { } _ { \odot } $ } and \mathrm { M _ { \mbox { \scriptsize { { \sc { Hi } } } } } } /L _ { B } = 1.65 M _ { \odot } / L _ { \odot } , with a radial velocity of v = 2750 \mathrm { km s ^ { -1 } } .
The optical galaxy is characterised by two regions of star formation , surrounded by an extended , diffuse halo .
J 0249 - 0806 , the new member of the NGC 1052 Group , has \mathrm { M _ { \mbox { \scriptsize { { \sc { Hi } } } } } } = 5.4 \times 10 ^ { 8 } \mbox { M$ { } _ { \odot% } $ } { } , \mathrm { M _ { \mbox { \scriptsize { { \sc { Hi } } } } } } /L _ { R } = 1.13 M _ { \odot } / L _ { \odot } and v = 1450 \mathrm { km s ^ { -1 } } .
The optical image reveals a low surface brightness galaxy .
We interpret both of these galaxies as irregular type , with J 0249 - 0806 possibly undergoing first infall into the NGC 1052 group .