Infrared spectral energy distributions of z ∼ 0.7 star-forming galaxies

Xian Zhong Zheng, Hervé Dole, Eric F. Bell, Emeric Le Floc'h, George H. Rieke, Hans Walter Rix, David Schiminovich

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We analyze the infrared (IR) spectral energy distributions (SEDs) for 10 μm < λrest < 100 μm for ∼600 galaxies at z ∼ 0.7 in the extended Chandra Deep Field South by stacking their Spitzer 24, 70, and 160 μm images. We place interesting constraints on the average IR SED shape in two bins: the brightest 25% of z ∼ 0.7 galaxies detected at 24 μm, and the remaining 75% of individually detected galaxies. Galaxies without individual detections at 24 μm were not well detected at 70 and 160 μm even through stacking. We find that the average IR SEDs of z ∼ 0.7 star-forming galaxies fall within the diversity of z ∼ 0 templates. While dust obscuration LIR/LUV seems to be only a function of star formation rate (SFR; ∼LIR + LUV), not of redshift, the dust temperature of star-forming galaxies (with SFR ∼ 10 M yr-1) at a given IR luminosity was lower at z ∼ 0.7 than today. We suggest an interpretation of this phenomenology in terms of dust geometry: intensely star-forming galaxies at z ∼ 0 are typically interacting, and host dense centrally concentrated bursts of star formation and warm dust temperatures. At z ∼ 0.7, the bulk of intensely star-forming galaxies are relatively undisturbed spirals and irregulars, and we postulate that they have large amounts of widespread lower density star formation, yielding lower dust temperatures for a given IR luminosity. We recommend which IR SEDs are most suitable for modeling intermediate-redshift galaxies with different SFRs.

Original languageEnglish (US)
Pages (from-to)301-312
Number of pages12
JournalAstrophysical Journal
Volume670
Issue number1
DOIs
StatePublished - Nov 20 2007

Fingerprint

spectral energy distribution
galaxies
dust
stars
energy
stacking
temperature
star formation
luminosity
distribution
geometry
occultation
star formation rate
axioms
phenomenology
bursts
modeling
templates

Keywords

  • Galaxies: evolution
  • Galaxies: starburst
  • Infrared: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Zheng, X. Z., Dole, H., Bell, E. F., Le Floc'h, E., Rieke, G. H., Rix, H. W., & Schiminovich, D. (2007). Infrared spectral energy distributions of z ∼ 0.7 star-forming galaxies. Astrophysical Journal, 670(1), 301-312. https://doi.org/10.1086/520529

Infrared spectral energy distributions of z ∼ 0.7 star-forming galaxies. / Zheng, Xian Zhong; Dole, Hervé; Bell, Eric F.; Le Floc'h, Emeric; Rieke, George H.; Rix, Hans Walter; Schiminovich, David.

In: Astrophysical Journal, Vol. 670, No. 1, 20.11.2007, p. 301-312.

Research output: Contribution to journalArticle

Zheng, XZ, Dole, H, Bell, EF, Le Floc'h, E, Rieke, GH, Rix, HW & Schiminovich, D 2007, 'Infrared spectral energy distributions of z ∼ 0.7 star-forming galaxies', Astrophysical Journal, vol. 670, no. 1, pp. 301-312. https://doi.org/10.1086/520529
Zheng, Xian Zhong ; Dole, Hervé ; Bell, Eric F. ; Le Floc'h, Emeric ; Rieke, George H. ; Rix, Hans Walter ; Schiminovich, David. / Infrared spectral energy distributions of z ∼ 0.7 star-forming galaxies. In: Astrophysical Journal. 2007 ; Vol. 670, No. 1. pp. 301-312.
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AB - We analyze the infrared (IR) spectral energy distributions (SEDs) for 10 μm < λrest < 100 μm for ∼600 galaxies at z ∼ 0.7 in the extended Chandra Deep Field South by stacking their Spitzer 24, 70, and 160 μm images. We place interesting constraints on the average IR SED shape in two bins: the brightest 25% of z ∼ 0.7 galaxies detected at 24 μm, and the remaining 75% of individually detected galaxies. Galaxies without individual detections at 24 μm were not well detected at 70 and 160 μm even through stacking. We find that the average IR SEDs of z ∼ 0.7 star-forming galaxies fall within the diversity of z ∼ 0 templates. While dust obscuration LIR/LUV seems to be only a function of star formation rate (SFR; ∼LIR + LUV), not of redshift, the dust temperature of star-forming galaxies (with SFR ∼ 10 M⊙ yr-1) at a given IR luminosity was lower at z ∼ 0.7 than today. We suggest an interpretation of this phenomenology in terms of dust geometry: intensely star-forming galaxies at z ∼ 0 are typically interacting, and host dense centrally concentrated bursts of star formation and warm dust temperatures. At z ∼ 0.7, the bulk of intensely star-forming galaxies are relatively undisturbed spirals and irregulars, and we postulate that they have large amounts of widespread lower density star formation, yielding lower dust temperatures for a given IR luminosity. We recommend which IR SEDs are most suitable for modeling intermediate-redshift galaxies with different SFRs.

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