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

J.-S. Huang; Y.-S. Dai; S. P. Willner; S. M. Faber; C. Cheng; H. Xu; H. Yan; S. Wu; X. Shao; C. Hao; X. Xia; D. Rigopoulou; M. Pereira Santaella; G. Magdis; I. Cortzen; G. G. Fazio; P. Assmann; L. Fan; M. Musin; Z. Wang; K. C. Xu; C. He; G. Jin; A. Esamdin

doi:10.3847/1538-4357/abec50

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

J.-S. Huang, Y.-S. Dai, S. P. Willner, S. M. Faber, C. Cheng, H. Xu, H. Yan, S. Wu, X. Shao, C. Hao, X. Xia, D. Rigopoulou, M. Pereira Santaella, G. Magdis, I. Cortzen, G. G. Fazio, P. Assmann, L. Fan, M. Musin, Z. WangK. C. Xu, C. He, G. Jin, A. Esamdin

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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.

Original language	English
Article number	161
Journal	Astrophysical Journal
Volume	912
Issue number	2
Number of pages	17
ISSN	0004-637X
DOIs	https://doi.org/10.3847/1538-4357/abec50
Publication status	Published - 2021

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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., ... Esamdin, A. (2021). A Complete 16 μm Selected Galaxy Sample at z ∼ 1: Mid-infrared Spectral Energy Distributions. Astrophysical Journal, 912(2), Article 161. https://doi.org/10.3847/1538-4357/abec50

@article{9bdc9d9086f04212be3dc3e6d89c2066,

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

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.",

author = "J.-S. Huang and Y.-S. Dai and Willner, {S. P.} and Faber, {S. M.} and C. Cheng and H. Xu and H. Yan and S. Wu and X. Shao and C. Hao and X. Xia and D. Rigopoulou and {Pereira Santaella}, M. and G. Magdis and I. Cortzen and Fazio, {G. G.} and P. Assmann and L. Fan and M. Musin and Z. Wang and Xu, {K. C.} and C. He and G. Jin and A. Esamdin",

year = "2021",

doi = "10.3847/1538-4357/abec50",

language = "English",

volume = "912",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Huang, J-S, Dai, Y-S, Willner, SP, Faber, SM, Cheng, C, Xu, H, Yan, H, Wu, S, Shao, X, Hao, C, Xia, X, Rigopoulou, D, Pereira Santaella, M, Magdis, G, Cortzen, I, Fazio, GG, Assmann, P, Fan, L, Musin, M, Wang, Z, Xu, KC, He, C, Jin, G & Esamdin, A 2021, 'A Complete 16 μm Selected Galaxy Sample at z ∼ 1: Mid-infrared Spectral Energy Distributions', Astrophysical Journal, vol. 912, no. 2, 161. https://doi.org/10.3847/1538-4357/abec50

TY - JOUR

T1 - A Complete 16 μm Selected Galaxy Sample at z ∼ 1: Mid-infrared Spectral Energy Distributions

AU - Huang, J.-S.

AU - Dai, Y.-S.

AU - Willner, S. P.

AU - Faber, S. M.

AU - Cheng, C.

AU - Xu, H.

AU - Yan, H.

AU - Wu, S.

AU - Shao, X.

AU - Hao, C.

AU - Xia, X.

AU - Rigopoulou, D.

AU - Pereira Santaella, M.

AU - Magdis, G.

AU - Cortzen, I.

AU - Fazio, G. G.

AU - Assmann, P.

AU - Fan, L.

AU - Musin, M.

AU - Wang, Z.

AU - Xu, K. C.

AU - He, C.

AU - Jin, G.

AU - Esamdin, A.

PY - 2021

Y1 - 2021

N2 - 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.

AB - 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.

U2 - 10.3847/1538-4357/abec50

DO - 10.3847/1538-4357/abec50

M3 - Journal article

SN - 0004-637X

VL - 912

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 161

ER -

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

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