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AGN SIG Seminar

Active Galactic Nuclei Science Interest Group

DATE

Oct 31, 2023

TIME

12:00 pm EST

COMMUNITY

AGN SIG

TYPE

Seminar

The Origin and Evolution of Luminous AGN: recent progress and future challenges

Dave Sanders

Luminous Active Galactic Nuclei (AGN: log Lx > 43 erg/s) are hypothesized to play a important role in galaxy evolution, yet how these objects are triggered and evolve is still poorly understood. A major advance has been the assembly of well-sampled (radio-to-Xray) spectral energy distributions (SEDs) of large, complete samples of X-ray-selected AGN. An analysis of these SEDs suggests a possible evolutionary scenario whereby luminous AGN begin their lives in a heavily dust-obscured phase before emerging as UV-excess Quasars. Observations with current facilities (e.g. Chandra, JWST, ALMA, VLA) are providing important constraints on AGN evolution; however, new facilities are required in the hard X-ray (10 – 50 keV) to provide accurate intrinsic X-ray luminosities for Compton-Thick sources, in the far-infrared (30 – 300 microns) to provide high-resolution (sub-aarcsond) constraints on source sizes, and in the radio (10 – 100 GHz) to provide sufficient sensitivity and resolution to detect compact jets and accurately identify the most obscured sources.

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An illustration of Sun-like star HD 181327 and its surrounding debris disk. The star is at top right. It is surrounded by a far larger debris disk that forms an incomplete ellpitical path and is cut off at right. There’s a huge cavity between the star and the disk. The debris disk is shown in shades of light gray. Toward the top and left, there are finer, more discrete points in a range of sizes. The disk appears hazier and smokier at the bottom. The star is bright white at center, with a hazy blue region around it. The background of space is black. The label Artist's Concept appears at lower left.