The AGN/starburst content in high redshift ULIRGs
نویسندگان
چکیده
We apply a simple model, tested on local ULIRGs, to disentangle the active galactic nucleus (AGN) and starburst contributions in submillimiter and 24 μm-selected ULIRGs observed with the Spitzer-IRS spectrometer. We quantitatively estimate the average AGN contribution to the stacked 6−8 μm rest-frame spectra of these sources in different luminosity and redshift ranges, and, under the assumption of similar infraredto-bolometric ratios as in local ULIRGs, the relative AGN/starburst contributions to the total infrared luminosity. Though the starburst component is always dominant in submillimeter-selected ULIRGs, we find a significant increase of the AGN contribution at redshift z > 2.3 with respect to lower z objects. Finally, we quantitatively confirm that the mid-infrared emission of 24 μm-selected ULIRGs is dominated by the AGN component, but the starburst component contributes significantly to the bolometric luminosity.
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تاریخ انتشار 2009