HiDetection of Two Dwarf S0 Galaxies in Nearby Groups: ESO 384-016 and NGC 59

An \hi survey of 10 dE/dS0 galaxies in the nearby Sculptor and Centaurus Agroups was made using the Australia Telescope Compact Array (ATCA). Theobserved galaxies have accurate distances derived by Jerjen et al (1998; 2000b)using the surface brightness fluctuation technique. Their absolute magnitudesare in the range $-9.5 > M_B > -15.3$. Only two of the ten galaxies weredetected at our detection limit ($\sim 1.0 \times 10^6$ \msol for the Centaurusgroup and $\sim 5.3 \times 10^5$ \msol for the Sculptor group), the two dS0galaxies ESO384-016 in the Centaurus A Group and NGC 59 in the Sculptor Group,with \hi masses of $6.0 \pm 0.5 \times 10^6$ \msol and $1.4 \pm 0.1 \times10^7$ \msol respectively. Those two detections were confirmed using the GreenBank Telescope. These small \hi reservoirs could fuel future generations of lowlevel star formation and could explain the bluer colors seen at the center ofthe detected galaxies. Similarly to what is seen with the Virgo dEs, the twoobjects with \hi appear to be on the outskirt of the groups.Comment: 25 pages (11 figures), accepted by A