EDP Sciences
Free access
Volume 408, Number 1, September II 2003
Page(s) 95 - 99
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20030772

A&A 408, 95-99 (2003)
DOI: 10.1051/0004-6361:20030772

A limit on nuclear activity in Leo A

E. 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 $L_{\rm X} <$ 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

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© ESO 2003