An X-ray Tail in the NGC 1407 Group

The nearby NGC 1407 Group shares properties with socalled fossil groups. andpresents a possibility to study a representative of this interesting class withhigh spatial resolution. The elliptical NGC 1407 dominates a group that has fewintermediate luminosity galaxies, but a large entourage of dwarfs. The velocitydispersion of this group is 387 km/s, whence M/L_R 340 M_sun/L_sun. The secondbrightest confirmed member, NGC 1400, has an extraordinarily deviant velocity ofvirgul1000 km/s in the group frame. ROSAT data reveal an Xray tail between NGC 1400and NGC 1407 with a highly unexpected peak on top of a dwarf member galaxy.Possible explanations include a BondiHoyle wake, stripped gas from NGC 1400, orsomething more exotic. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]