A limit on nuclear activity in Leo A

Details A limit on nuclear activity in Leo A A limit on nuclear activity in Leo A

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...408...95m&link_type=abstract

Astronomy and Astrophysics, v.408, p.95-99 (2003)

Astronomy and Astrophysics

Astrophysics

Galaxies: Nuclei, Galaxies: Individual: Leo A, Galaxies: Local Group, X-Rays: Galaxies, X-Rays: Individuals: Leo A

Scientific paper

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{ZM}). 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 LX < 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.

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