| 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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.