Preprint article · Journal article
A Complete 16 μm Selected Galaxy Sample at z ∼ 1: Mid-infrared Spectral Energy Distributions
Chinese Academy of Sciences1
Universidad de Concepción2
China University of Science and Technology3
University of Science and Technology of China4
Harvard-Smithsonian Center for Astrophysics5
University of California at Santa Cruz6
University of Missouri7
Tianjin Normal University8
University of Oxford9
Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark10
National Space Institute, Technical University of Denmark11
University of Copenhagen12
...and 2 moreWe describe a complete, flux-density-limited sample of galaxies at redshift 0.8 < z < 1.3 selected at 16 μm. At the selection wavelength near 8 μm rest, the observed emission comes from both dust heated by intense star formation and active galactic nuclei (AGNs). Fitting the spectral energy distributions (SEDs) of the sample galaxies to local-galaxy templates reveals that more than half the galaxies have SEDs dominated by star formation.
About one-sixth of the galaxy SEDs are dominated by an AGN, and nearly all of the rest of the SEDs are composite. Comparison with X-ray and far-infrared observations shows that combinations of luminosities at rest-frame 4.5 and 8 μm give good measures of both AGN luminosity and star formation rate. The sample galaxies mostly follow the established star-forming main sequence for z = 1 galaxies, but of the galaxies more than 0.5 dex above that main sequence, more than half have AGN-type SEDs.
Similarly, the most luminous AGNs tend to have higher star formation rates than the main-sequence value. Galaxies with stellar masses >1011 M⊙ are unlikely to host an AGN. About 1% of the sample galaxies show an SED with dust emission typical of neither star formation nor an AGN.
Language: | English |
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Year: | 2021 |
Pages: | 161 |
ISSN: | 15384365 , 00670049 , 0004637x and 15384357 |
Types: | Preprint article and Journal article |
DOI: | 10.3847/1538-4357/abec50 |
ORCIDs: | Magdis, G. , 0000-0001-9197-7623 , 0000-0001-6511-8745 , 0000-0002-7928-416X , 0000-0002-9895-5758 , 0000-0003-4996-214X , 0000-0003-0202-0534 , 0000-0001-7592-7714 , 0000-0001-6854-7545 , 0000-0002-4005-9619 , 0000-0002-0670-0708 , 0000-0003-4200-4432 , 0000-0003-3087-318X and 0000-0003-1845-4900 |