Abstract

Active galactic nuclei (AGNs) are capable of producing highly luminous emission across the entirety of the electromagnetic spectrum. Each waveband has characteristic features that can be used to separate AGNs from typical, inactive galaxies. However, each AGN has a unique combination of physical characteristics--such as the black hole mass, accretion rate, obscuring column density, orientation angle, and/or presence of relativistic jets--that create a unique spectral shape. Thus, a single AGN identification technique using a single wavelength will fail to find all types of AGNs. The resulting sample will bias the results of larger statistical studies. Therefore, it is critical to include multiple AGN criteria across different wavelengths. This motivates the AGN Multiwavelength Emission Tabulation (AMMIT) project: in this work, we use multiwavelength observations to build a highly compete sample of AGNs in the COSMOS field. We identify AGNs by their X-ray luminosity, UV-optical spectral features, characteristic infrared colors, or excess radio emissions. We identify 13752 total AGNs, with 1917 identified by more than one technique. The AGNs span up to z~2, with 95.9% of sources at z< 3. We present the sky coordinates, each selection technique used and its related data, and the best available redshifts for all AGNs as the COSMOS-AMMIT catalog.

Publication Date

8-2026

Document Type

Thesis

Student Type

Graduate

Degree Name

Astrophysical Sciences and Technology (MS)

Department, Program, or Center

Physics and Astronomy, School of

College

College of Science

Advisor

Jeyhan Kartaltepe

Advisor/Committee Member

Andrew Robinson

Campus

RIT – Main Campus

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