Clustering of the Diffuse Infrared Light from the COBE DIRBE maps. I.
. The cosmic infrared background (CIB) and its anisotropy have not yet been measured, but are important signatures of the early evolution and clustering of galaxies. The near IR is particularly interesting because redshift effects bring the peak luminosity of distant galaxies into the near IR, allowing high redshift objects to dominate the theoretical predictions of the CIB and its fluctuations. This paper is devoted to studying the CIB through its correlation properties. We studied the limits on CIB anisotropy in the near IR (1.25, 2.2, and 3.5 ¯m, or J; K; L) bands at a scale of 0.7 ffi using the COBE 1 Diffuse Infrared Background Experiment (DIRBE) data. In single bands we obtain the upper limits on the zero-lag correlation signal C(0) = h( ffi I ) 2 i ! 3:6 Theta 10 Gamma16 ; 5:1 Theta 10 Gamma17 ; 5:7 Theta 10 Gamma18 W 2 m Gamma4 sr Gamma2 for the J; K; L bands respectively. The DIRBE data exhibit a clear color between the various bands with a small ...
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ABSTRACT: We searched for the near infrared extragalactic background light (IREBL) in the data from the Near Infrared Spectrometer (NIRS) on the Infrared Telescope in Space (IRTS). After subtracting the contribution of faint stars and zodiacal component based on the model, significant isotropic emission is detected whose in-band flux amounts to ∼ 30 nWm-2sr-1. This brightness is consistent with upper limits of COBE/DIRBE, but is much brighter than the integrated light of faint galaxies at the H and K bands. A significant fluctuation of the skybrigh tness was also detected that can not be explained bykno wn foreground emission components. 2- point correlation analysis indicates that the fluctuation has a characteristic spatial frequencyat 1 ∼ 2 × 102 arcmin. These results indicate that the detected isotropic emission is cosmological in origin, and is new observational evidence for the study of the formation and evolution of galaxies.
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