Uncovering AGNs Missed by Optical Surveys in Late-type Galaxies

Astronomy and Astrophysics – Astronomy

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Scientific paper

The vast majority of currently known active galactic nuclei (AGN) in the local Universe reside in host galaxies with prominent bulges, leading to the general consensus that black hole formation and growth is fundamentally connected to the build-up of galaxy bulges. However, recent mid-infrared spectroscopic studies using Spitzer of a sample of optically "normal” late-type galaxies reveal remarkably the presence of high-ionization [NeV] lines in several sources, providing strong evidence for AGNs in these galaxies. We present follow-up X-ray observations recently obtained with XMM-Newton of two such sources, the late-type optically normal galaxies NGC 4536 and NGC 3367. Both sources are detected in our observations. Detailed spectral analysis suggests that they are both consistent with AGN. These observations are used to estimate the AGN luminosity and place constraints on the black hole mass in these galaxies.

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