A limit on nuclear activity in Leo A
Dunsink Observatory, Castleknock, Dublin 15, Ireland
Corresponding author: email@example.com
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 [CITE]). 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