The AGN-Star Formation Connection: Future Prospects with JWST

Allison Kirkpatrick, Stacey Alberts, Alexandra Pope, Guillermo Barro, Matteo Bonato, Dale D. Kocevski, Pablo Pérez-González, George H. Rieke, Lucia Rodríguez-Muñoz, Anna Sajina, Norman A. Grogin, Kameswara Bharadwaj Mantha, Viraj Pandya, Janine Pforr, Mara Salvato, Paola Santini

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The bulk of the stellar growth over cosmic time is dominated by IR-luminous galaxies at cosmic noon (z = 1-2), many of which harbor a hidden active galactic nucleus (AGN). We use state-of-the-art infrared color diagnostics, combining Spitzer and Herschel observations, to separate dust-obscured AGNs from dusty star-forming galaxies (SFGs) in the CANDELS and COSMOS surveys. We calculate 24 μm counts of SFGs, AGN/star-forming "Composites, " and AGNs. AGNs and Composites dominate the counts above 0.8 mJy at 24 μm, and Composites form at least 25% of an IR sample even to faint detection limits. We develop methods to use the Mid-Infrared Instrument (MIRI) on JWST to identify dust-obscured AGNs and Composite galaxies from z ∼ 1-2. With the sensitivity and spacing of MIRI filters, we will detect > 4 times as many AGN hosts as with Spitzer/IRAC criteria. Any star formation rates based on the 7.7 μm PAH feature (likely to be applied to MIRI photometry) must be corrected for the contribution of the AGN, or the star formation rate will be overestimated by ∼ 35% for cases where the AGN provides half the IR luminosity and ∼ 50% when the AGN accounts for 90% of the luminosity. Finally, we demonstrate that our MIRI color technique can select AGNs with an Eddington ratio of λEdd ∼ 0.01 and will identify AGN hosts with a higher specific star formation rate than X-ray techniques alone. JWST/MIRI will enable critical steps forward in identifying and understanding dust-obscured AGNs and the link to their host galaxies.

Original languageEnglish (US)
Article number111
JournalAstrophysical Journal
Volume849
Issue number2
DOIs
StatePublished - Nov 10 2017

Keywords

  • galaxies: active
  • galaxies: photometry
  • galaxies: star formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'The AGN-Star Formation Connection: Future Prospects with JWST'. Together they form a unique fingerprint.

  • Cite this

    Kirkpatrick, A., Alberts, S., Pope, A., Barro, G., Bonato, M., Kocevski, D. D., Pérez-González, P., Rieke, G. H., Rodríguez-Muñoz, L., Sajina, A., Grogin, N. A., Mantha, K. B., Pandya, V., Pforr, J., Salvato, M., & Santini, P. (2017). The AGN-Star Formation Connection: Future Prospects with JWST. Astrophysical Journal, 849(2), [111]. https://doi.org/10.3847/1538-4357/aa911d