Results from Multi-wavelength Follow-ups of Hard X-ray Selected Samples

Astronomy and Astrophysics – Astronomy

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Scientific paper

Supermassive black holes reside at the centers of most massive galaxies. Among these, only 10-20% actively accrete matter, emitting powerful amounts of energy across the full electromagnetic spectrum. Many questions about the nature of AGN remain, such as what are the properties of these sources, what activates accretion, and how do AGN influence their host galaxies. In order to answer these questions, it is imperative to select an unbiased sample of AGN. Very hard X-ray selection is ideal since AGN directly emit their energy in this band and the emission is powerful enough to cut through much of the dust and gas that obscures the AGN signature in softer wave bands. In this talk, we highlight the results of multi-wavelength follow-ups of nearby AGN selected through the Swift Burst Alert Telescope survey. We present results from X-ray, optical, and infrared spectroscopy. We compare various methods of determining the bolometric luminosity, including X-ray, optical [O III] 5007 Angstrom emission, and mid-IR emission lines measured from high-resolution Spitzer observations. We also compare the luminosity measurements between Seyfert 1s and 2s and show that these distributions fit well in the unified AGN model. Among the new results from imaging follow-ups on the host galaxies, we show the host galaxies of the very hard X-ray selected AGN are mostly spirals and peculiars with a high rate of mergers. This suggests that mergers are triggering the active accretion phase in nearby AGN.

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