Are There Hidden AGNs In Local Lyman Break Galaxies?

Astronomy and Astrophysics – Astronomy

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Scientific paper

We used XMM-Newton to observe 6 compact Ultra-Violet Luminous Galaxies (UVLGs). These local (z<0.3) UVLGs have properties very similar to distant Lyman Break Galaxies, making them good local analogs. Our XMM sample was selected to investigate objects whose optical emission-line properties suggest might be composite starburst/Type2 AGN. Fitting the X-ray spectra as absorbed power-laws gives an absorbing column density of less than 1021 cm-2 in all cases. The derived X-ray to [OIII] luminosity ratio is low, and would only be compatible with the presence of an AGN if it were heavily absorbed in the X-ray regime. We will compare the observed X-ray luminosities of the UVLGs to those of typical starburst galaxies with similar bolometric luminosities in order to determine whether the X-ray emission of the UVLGs can be produced by a starburst alone, or whether an AGN is required. (This work is supported by NASA grant NNX08AZ0G.)

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