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James Webb Space Telescope
JWST Science Corner

Recent JWST Science Highlights - AGN

Active Galactic Nucleus and Quasar Science with Aperture Masking Interferometry on the James Webb Space Telescope

Why JWST is important:-High resolution (65-90 mas) aperture masking imaging between 3-5 um with NIRISS to study processes near AGN nuclei - feedback, binarity. JWSt is essential because of low thermal background and wavelength coverage, to study dust and star forming regions in AGN.
(click here for the abstract)

Reference: Saavik Ford, City University of New York, Co-authors:-B. McKernan, A. Sivaramakrishnan, A. R. Martel, A. Koekemoer, D. Lafreniere, S. Parmentier, 2014ApJ, 783, 73F

Saavik Ford fig16
Figure 16. 2014ApJ, 783, 73F

The Dependency of AGN Infrared Colour-Selection on Source Luminosity and Obscuration. An Observational Perspective in CDFS and COSMOS

Why JWST is important:-In this work we classify the AGN sample selected by IR colour-colour criteria (Stern et al. 2005, Lacy et al. 2007, Donley et al. 2012, Messias et al. 2012) in terms of X-ray luminosity and AGN obscuration. We conclude that AGN IR-selection is mostly dependent on luminosity and not so much on obscuration. The high-resolution imaging enabled by JWST is thus key to identify low-luminosity AGN in stellar or star-forming dominated hosts. We also identify the JWST broad-band filters 2.0um, 4.4um, 7.7um, and 18um to be essential to disentangle AGN from non-AGN dominated SEDs in the redshift range 0<z<7 at depths where spectroscopy becomes impractical.
(click here for the abstract)

Reference: Hugo Messias, Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, OAL, Tapada da Ajuda, PT1349-018 Lisboa, Portugal, Co-authors:- Jose M Afonso, Mara Salvato, Bahram Mobasher, Andrew M Hopkins, 2014, A&A, 562A, 144M

Messias fig6
Figure 6. 2014 A&A 562A, 144M