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2003A&A...408...95M - Astronomy and Astrophysics, volume 408, 95-99 (2003/9-2)
A limit on nuclear activity in Leo A.
MEURS E.J.A.
Abstract (from CDS):
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, 2001ApJ...556...24Z). 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 (logLX<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.
Abstract Copyright: ∼
Journal keyword(s): galaxies: nuclei - galaxies: individual: Leo A - galaxies: Local Group - X-rays: galaxies - X-rays: individual: Leo A
Nomenclature: Fig.1, Tables 1, 2: [M2003c] 1-NN (Nos 1-1 to 1-13) = [M2003c] JHHMMSS.ss+DDMMSS.s. Fig.2, Table 2: [M2003c] 2-N (Nos 2-1 to 2-6) = [M2003c] JHHMMSS.ss+DDMMSS.s.
Simbad objects: 19
