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Title: A Complete 16 μm Selected Galaxy Sample at z ∼ 1: Mid-infrared Spectral Energy Distributions
Authors: Huang, J. S.
Dai, Y. S.
Willner, S. P.
Faber, S. M.
Cheng, C.
Xu, H.
Yan, H.
Wu, S.
Shao, X.
Hao, C.
Xia, X.
Rigopoulou, D.
Pereira Santaella, M.
Magdis, G.
Cortzen, I.
Fazio, G. G.
Assmann, P.
Fan, L.
Musin, M.
Zang, Z.
Xu, K. C.
He, C.
Jin, G.
Esamdin, A.
Keywords: Infrared galaxies;Luminous infrared galaxies;Sky surveys;Spectral energy distribution
Issue Date: 28-May-2021
Publisher: IOP Science Publishing
DOI: 10.3847/1538-4357/abec50
Published version:
Citation: The Astrophysical Journal 912(2): 161(2021)
Abstract: We 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.
E-ISSN: 1538-4357
ISSN: 0004-637X
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