An X-ray Tail in the NGC 1407 Group

Physics

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Groups Of Galaxies, Clusters Of Galaxies, Supercluster, Ngc 1407 Group, Xmm-Newton Proposal 04047501

Scientific paper

The nearby NGC 1407 Group shares properties with so-called `fossil groups' and presents a possibility to study a representative of this interesting class with high spatial resolution. The elliptical NGC 1407 dominates a group that has few intermediate luminosity galaxies, but a large entourage of dwarfs. The velocity dispersion of this group is 387 km/s, whence M/L_R = 340 M_sun/L_sun. The second brightest confirmed member, NGC 1400, has an extraordinarily deviant velocity of ~1000 km/s in the group frame. ROSAT data reveal an X-ray tail between NGC 1400 and NGC 1407 with a highly unexpected peak on top of a dwarf member galaxy. Possible explanations include a Bondi-Hoyle wake, stripped gas from NGC 1400, or something more exotic.

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