TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 65 (No. 3), pp. 273-279, 2013

Clustering of far-infrared galaxies in the AKARI All-Sky Survey

A. Pollo1,2,3, T. T. Takeuchi4, T. L. Suzuki4, and S. Oyabu4

1National Centre for Nuclear Research, Hoża 69, 00-681 Warsaw, Poland
2Astronomical Observatory of the Jagiellonian University, Orla 171, 30-001 Cracow, Poland
3Center for Theoretical Physics of the Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland
4Division of Particle and Astrophysical Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan

(Received December 15, 2011; Revised August 21, 2012; Accepted August 22, 2012; Online published March 12, 2013)

Abstract: We present the first measurement of the angular two-point correlation function for AKARI 90-μm point sources, detected outside of the Milky Way plane and other regions characterized by high Galactic extinction, and categorized as extragalactic sources according to our far-infrared-color based criterion (Pollo et al., 2010). This is the first measurement of the large-scale angular clustering of galaxies selected in the far-infrared after IRAS measurements. Although a full description of the clustering properties of these galaxies will be obtained by more detailed studies, using either a spatial correlation function, or better information about properties and, at least, photometric redshifts of these galaxies, the angular correlation function remains the first diagnostic tool to establish the clustering properties of the catalog andthe observed galaxy population. We find a non-zero clustering signal in both hemispheres extending up to ∼40 degrees, without anysignificant fluctuations at larger scales. The observed correlation function is well fitted by a power-law function. The notable differences between the northern and southern hemispheres are found, which can probably be sattributed to the photometry problems, and might point to the necessity of performing a better calibration in the data from the southern hemisphere.
Key words: Galaxies: clustering, large scale structure, dust, infrared, cosmology.

Corresponding author E-mail: apollo@fuw.edu.pl

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