A&A 408, 95-99 (2003)
A limit on nuclear activity in Leo AE. J. A. Meurs
Dunsink Observatory, Castleknock, Dublin 15, Ireland
(Received 29 March 2002 / Accepted 20 May 2003)
ROSAT HRI observations of Leo A are analysed in order to complement a recent X-ray survey of the centres of Local Group galaxies (Zang & Meurs 2001). It is likely that high-energy cores in galaxies are indicative of some level of nuclear activity. The upper limit 0.1-2.4 keV luminosity determined for Leo A (log 35.77) is consistent with the results that were obtained for other small Local Group systems. Leo A represents the lowest optical luminosity Irregular galaxy in the Local Group that has been studied at X-rays. Also the ROSAT All Sky Survey data allow to derive a (less constraining) upper limit flux for this galaxy.
Key words: galaxies: nuclei -- galaxies: individual: Leo A -- galaxies: Local Group -- X-rays: galaxies -- X-rays: individuals: Leo A
© ESO 2003