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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Clustering of star-forming galaxies detected in mid-infrared with the Spitzer wide-area survey
Astrophysical Journal, Volume 751, No. 2, Article 126, Year 2012
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Description
We discuss the clustering properties of galaxies with signs of ongoing star formation detected by the Spitzer Space Telescope at the 24 μm band in the SWIRE Lockman Hole field. The sample of mid-IR-selected galaxies includes 20,000 objects detected above a flux threshold of S 24 μm = 310 μJy. We adopt optical/near-IR color selection criteria to split the sample into the lower-redshift and higher-redshift galaxy populations. We measure the angular correlation function on scales of θ = 001-35, from which, using the Limber inversion along with the redshift distribution established for similarly selected source populations in the GOODS fields (Rodighiero et al.), we obtain comoving correlation lengths of r 0 = 4.98 ± 0.28 h -1Mpc and r 0 = 8.04 ± 0.69 h -1Mpc for the low-z (z mean = 0.7) and high-z (z mean = 1.7) subsamples, respectively. Comparing these measurements with the correlation functions of dark matter (DM) halos identified in the Bolshoi cosmological simulation, we find that the high-redshift objects reside in progressively more massive halos reaching M tot ≳ 3 × 1012 h -1 M ⊙, compared to M tot ≳ 7 × 1011 h -1 M ⊙ for the low-redshift population. Approximate estimates of the IR luminosities based on the catalogs of 24 μm sources in the GOODS fields show that our high-z subsample represents a population of "distant ULIRGs" with L IR > 1012 L ⊙, while the low-z subsample mainly consists of "LIRGs," L IR 1011 L ⊙. The comparison of number density of the 24 μm selected galaxies and of DM halos with derived minimum mass M tot shows that only 20% of such halos may host star-forming galaxies. © 2012. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Starikova, S.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Italy, Padua
Università Degli Studi Di Padova
Berta, Stefano
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Franceschini, Alberto
Italy, Padua
Università Degli Studi Di Padova
Marchetti, Lucia
Italy, Padua
Università Degli Studi Di Padova
Rodighiero, Giulia
Italy, Padua
Università Degli Studi Di Padova
Vaccari, Mattia
Italy, Padua
Università Degli Studi Di Padova
South Africa, Bellville
University of the Western Cape
Vikhlinin, Alexey A.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Russian Federation, Moscow
Space Research Institute of the Russian Academy of Sciences
Statistics
Citations: 15
Authors: 7
Affiliations: 5
Identifiers
Doi:
10.1088/0004-637X/751/2/126
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative