Detecting faint galaxies by stacking at 24 μm

X. Z. Zheng, Eric F. Bell, Hans Walter Rix, Casey Papovich, Emeric Le Floc'h, George H. Rieke, P. G. Pérez-González

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We stack Spitzer 24 μm images for ∼7000 galaxies with 0.1 ≤ z < 1 in the Chandra Deep Field South to probe the thermal dust emission in low-luminosity galaxies over this redshift range. Through stacking, we can detect mean 24 μm fluxes that are more than an order of magnitude below the individual detection limit. We find that the correlations for low- and moderate-luminosity galaxies between the average LIR/LUV and rest-frame B-band luminosity, and between the star formation rate (SFR) and LIR/LUV, are similar to those in the local universe. This verifies that oft-used assumption in deep UV/optical surveys that the dust obscuration - SFR relation for galaxies with SFR ≤ 20 M yr-1 varies little with epoch. We have used this relation to derive the cosmic IR luminosity density from z = 1 to z = 0.1. The results also demonstrate directly that little of the bolometric luminosity of the galaxy population arises from the faint end of the luminosity function, indicating a relatively flat faint-end slope of the IR luminosity function with a power-law index of 1.2 ± 0.3.

Original languageEnglish (US)
Pages (from-to)784-800
Number of pages17
JournalAstrophysical Journal
Volume640
Issue number2 I
DOIs
StatePublished - Apr 1 2006

Fingerprint

stacking
luminosity
galaxies
star formation rate
dust
occultation
power law
universe
time measurement
probe
slopes
probes
rate

Keywords

  • Galaxies: evolution
  • Galaxies: general
  • Infrared: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Zheng, X. Z., Bell, E. F., Rix, H. W., Papovich, C., Le Floc'h, E., Rieke, G. H., & Pérez-González, P. G. (2006). Detecting faint galaxies by stacking at 24 μm. Astrophysical Journal, 640(2 I), 784-800. https://doi.org/10.1086/500253

Detecting faint galaxies by stacking at 24 μm. / Zheng, X. Z.; Bell, Eric F.; Rix, Hans Walter; Papovich, Casey; Le Floc'h, Emeric; Rieke, George H.; Pérez-González, P. G.

In: Astrophysical Journal, Vol. 640, No. 2 I, 01.04.2006, p. 784-800.

Research output: Contribution to journalArticle

Zheng, XZ, Bell, EF, Rix, HW, Papovich, C, Le Floc'h, E, Rieke, GH & Pérez-González, PG 2006, 'Detecting faint galaxies by stacking at 24 μm', Astrophysical Journal, vol. 640, no. 2 I, pp. 784-800. https://doi.org/10.1086/500253
Zheng XZ, Bell EF, Rix HW, Papovich C, Le Floc'h E, Rieke GH et al. Detecting faint galaxies by stacking at 24 μm. Astrophysical Journal. 2006 Apr 1;640(2 I):784-800. https://doi.org/10.1086/500253
Zheng, X. Z. ; Bell, Eric F. ; Rix, Hans Walter ; Papovich, Casey ; Le Floc'h, Emeric ; Rieke, George H. ; Pérez-González, P. G. / Detecting faint galaxies by stacking at 24 μm. In: Astrophysical Journal. 2006 ; Vol. 640, No. 2 I. pp. 784-800.
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