X-ray properties of the "Composite" Seyfert/Star-forming galaxies

Details X-ray properties of the "Composite" Seyfert/Star-forming galaxies X-ray properties of the "Composite" Seyfert/Star-forming galaxies

2004-07-28

arxiv.org/abs/astro-ph/0407585v1

Astronomy and Astrophysics

Astrophysics

4 pages; 3 figure; proceedings of XLVIII Congresso della Societa' Astronomica Italiana, Milano, Italy 19-23 april 2004, to be

Scientific paper

An enigmatic, small class of IR and X-ray luminous sources, named ``Composite'' starburst/Seyfert galaxies, has been defined from IRAS and RASS data. The objects have optical spectra dominated by the features of HII galaxies (plus, in some cases, weak Seyfert signatures) but X-ray luminosities higher than expected from starbursts and more typical of Seyfert nuclei. The true nature of this class of objects is still unknown. We present Chandra data of four of these galaxies that were obtained to investigate the nature of the X-ray source. The X-ray spectrum, the lack of any significant extended component, and the observed variability indicate that the AGN is the dominant component in the X-ray domain.

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