Issue |
A&A
Volume 408, Number 1, September II 2003
|
|
---|---|---|
Page(s) | 95 - 99 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20030772 | |
Published online | 17 November 2003 |
A limit on nuclear activity in Leo A
Dunsink Observatory, Castleknock, Dublin 15, Ireland
Corresponding author: ejam@dunsink.dias.ie
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
[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
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