A Complete 16 μm Selected Galaxy Sample at z ∼ 1: Mid-infrared Spectral Energy Distributions

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 di...

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Detalles Bibliográficos
Autores: 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, Dimitra, Pereira Santaella, Miguel, Magdis, Georgios E., Cortzen, I., Fazio, G. G., Assmann, P., Fan, L., Musin, M., Zang, Z., Xu, K. C., He, C., Jin, G., Esamdin, A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Instituto Nacional de Técnica Aeroespacial (INTA)
Repositorio:DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
OAI Identifier:oai:digital.inta.es:20.500.12666/628
Acceso en línea:https://iopscience.iop.org/article/10.3847/1538-4357/abec50
http://hdl.handle.net/20.500.12666/628
Access Level:acceso abierto
Palabra clave:Infrared galaxies
Luminous infrared galaxies
Sky surveys
Spectral energy distribution
Descripción
Sumario: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.

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