DETECTION OF THE COSMIC FAR-INFRARED BACKGROUND IN AKARI DEEP FIELD SOUTH

We report new limits on the absolute brightness and spatial fluctuations of the cosmic infrared background (CIB) via the AKARI satellite. We carried out observations at 65, 90, 140, and 160 μm as a cosmological survey in AKARI Deep Field South, which is one of the lowest cirrus regions with a contiguous area of the sky. After removing bright galaxies and subtracting zodiacal and Galactic foregrounds from the measured sky brightness, we successfully measured the CIB brightness and its fluctuations across a wide range of angular scales, from arcminutes to degrees. The measured CIB brightness is consistent with previous results reported from COBE data, but significantly higher than the lower limits at 70 and 160 μm obtained via Spitzer from the stacking analysis of selected 24 μm sources. The discrepancy with the Spitzer result is possibly due to a new galaxy population at high redshift obscured by hot dust or unknown diffuse emission. From a power spectrum analysis at 90 μm, two components were identified: the CIB fluctuations with shot noise due to individual galaxies in a small angular scale from the beam size up to 10 arcminutes, and Galactic cirrus emission dominating at the largest angular scales of a few degrees. The overall shape of the power spectrum at 90 μm is very similar to that at longer wavelengths, as observed by Spitzer and the Balloon-borne Large-Aperture Submillimeter Telescope (BLAST). Our power spectrum, with an intermediate angular scale of 10–30 arcminutes, gives a firm upper limit for galaxy clustering, which was found by Spitzer and BLAST. Moreover, the color of the CIB fluctuations, which is obtained by combining our data with the previous results, is as red as ultra-luminous infrared galaxies at high redshift. These galaxies are not likely to provide the majority of the CIB emission at 90 μm, but are responsible for the fluctuations. Our results provide new constraints on the evolution and clustering properties of distant infrared galaxies and any diffuse emission from the early universe.

[1]  A. Cimatti,et al.  Herschel deep far-infrared counts through Abell 2218 cluster-lens , 2010, 1005.1575.

[2]  A. Cimatti,et al.  Dissecting the cosmic infra-red background with Herschel/PEP , 2010, 1005.1073.

[3]  Hidehiro Kaneda,et al.  Calibration and Performance of the AKARI Far-Infrared Surveyor (FIS) — Slow-Scan Observation Mode for Point-Sources , 2009, 0904.3788.

[4]  Heidelberg,et al.  Determination of the cosmic far-infrared background level with the ISOPHOT instrument , 2009, 0904.2997.

[5]  James J. Bock,et al.  BLAST: CORRELATIONS IN THE COSMIC FAR-INFRARED BACKGROUND AT 250, 350, AND 500 μm REVEAL CLUSTERING OF STAR-FORMING GALAXIES , 2009, 0904.1200.

[6]  Itziar Aretxaga,et al.  Over half of the far-infrared background light comes from galaxies at z ≥ 1.2 , 2009, Nature.

[7]  James J. Bock,et al.  BLAST: A FAR-INFRARED MEASUREMENT OF THE HISTORY OF STAR FORMATION , 2009, 0904.1206.

[8]  James J. Bock,et al.  BLAST: RESOLVING THE COSMIC SUBMILLIMETER BACKGROUND , 2009, 0904.1205.

[9]  T. Nakagawa,et al.  The space infrared telescope for cosmology and astrophysics: SPICA A joint mission between JAXA and ESA , 2009 .

[10]  Takao Nakagawa,et al.  SPICA mission for mid- and far-infrared astronomy , 2008, Astronomical Telescopes + Instrumentation.

[11]  U. Padova,et al.  Extragalactic optical-infrared background radiation, its time evolution and the cosmic photon-photon opacity , 2008, 0805.1841.

[12]  Martin G. Cohen,et al.  The Far-Infrared Surveyor (FIS) for AKARI , 2007, 0708.3004.

[13]  S. Oh,et al.  The infrared astronomical mission AKARI , 2007, 0708.1796.

[14]  T. Nakagawa,et al.  AKARI Far-Infrared Source Counts in the Lockman Hole , 2007, 0707.0039.

[15]  N. Takeyama,et al.  The Infrared Camera (IRC) for AKARI–Design and Imaging Performance , 2007, 0705.4144.

[16]  R. J. Reynolds,et al.  Determination of the Far-Infrared Cosmic Background Using COBE DIRBE and WHAM Data , 2007, 0705.3966.

[17]  H. Lee,et al.  Galaxy colours in the AKARI deep SEP survey , 2007, 0705.1860.

[18]  G. Lagache,et al.  Statistical properties of dust far-infrared emission , 2007, 0704.2175.

[19]  E. L. Wright,et al.  DIRBE Minus 2MASS: Confirming the CIRB in 40 New Regions at 2.2 and 3.5 μm , 2007, 0704.1498.

[20]  Rodger I. Thompson,et al.  Constraints on the Cosmic Near-Infrared Background Excess from NICMOS Deep Field Observations , 2006, astro-ph/0612033.

[21]  D. Elbaz,et al.  Spitzer 70 Micron Source Counts in GOODS-North , 2006, astro-ph/0606676.

[22]  S. Okamura,et al.  Deep Extragalactic Surveys around the Ecliptic Poles with AKARI (ASTRO-F) , 2006, astro-ph/0605589.

[23]  G. Rieke,et al.  The Cosmic Infrared Background Resolved by Spitzer. Contributions of Mid-Infrared Galaxies to the Far-Infrared Background. , 2006, astro-ph/0603208.

[24]  Woong-Seob Jeong,et al.  Far-infrared detection limits – II. Probing confusion including source confusion , 2006, astro-ph/0603163.

[25]  M. Dickinson,et al.  Spitzer Number Counts of Active Galactic Nuclei in the GOODS Fields , 2005, astro-ph/0512007.

[26]  S. H. Moseley,et al.  Tracing the first stars with fluctuations of the cosmic infrared background , 2005, Nature.

[27]  D. Padgett,et al.  Spitzer 70 and 160 μm Observations of the Extragalactic First Look Survey , 2005, astro-ph/0509649.

[28]  Guilaine Lagache,et al.  DUSTY INFRARED GALAXIES: Sources of the Cosmic Infrared Background , 2005, astro-ph/0507298.

[29]  Soojong Pak,et al.  Far-infrared detection limits¿ I. Sky confusion due to Galactic cirrus , 2005 .

[30]  H. Murakami,et al.  Infrared Telescope in Space Observations of the Near-Infrared Extragalactic Background Light , 2004, astro-ph/0411593.

[31]  L. V. Tóth,et al.  The European Large Area ISO Survey - VIII. 90-μm final analysis and source counts , 2004, astro-ph/0410379.

[32]  G. Rieke,et al.  Polycyclic Aromatic Hydrocarbon Contribution to the Infrared Output Energy of the Universe at z ≃ 2 , 2004, astro-ph/0406016.

[33]  O. Krause,et al.  Far-infrared Source Counts at 70 and 160 Microns in Spitzer Deep Surveys , 2004, astro-ph/0406021.

[34]  Scott C. Chapman,et al.  Accurate Spectral Energy Distributions and Selection Effects for High-Redshift Dusty Galaxies: A New Hot Population to Discover with the Spitzer Space Telescope? , 2004, astro-ph/0404438.

[35]  N. Yoshida,et al.  First sources in infrared light: stars, supernovae and miniquasars , 2004, astro-ph/0404109.

[36]  S. Serjeant,et al.  The European Large Area ISO Survey – IX. The 90-μm luminosity function from the Final Analysis sample , 2004, astro-ph/0401289.

[37]  E. Wright.  COBE observations of the cosmic infrared background , 2003, astro-ph/0306058.

[38]  H. Matsuhara,et al.  ISO deep far-infrared survey in the “Lockman Hole” - III. Catalogs and source counts at 90 & 170 μm , 2004 .

[39]  Hidehiro Kaneda,et al.  Development of a gallium-doped germanium far-infrared photoconductor direct hybrid two-dimensional array. , 2003, Applied optics.

[40]  A. Franceschini,et al.  A far-infrared view of the Lockman Hole from ISO 95-μm observations – I. A new data reduction method , 2003, astro-ph/0304247.

[41]  Takao Nakagawa,et al.  Monolithic Ge:Ga two-dimensional array detector for FIS instrument on ASTRO-F , 2003, SPIE Astronomical Telescopes + Instrumentation.

[42]  C. Baccigalupi,et al.  Predictions for statistical properties of forming spheroidal galaxies , 2003 .

[43]  Takao Nakagawa,et al.  Large-format and compact stressed Ge:Ga array for the ASTRO-F (IRIS) mission , 2002 .

[44]  G. Lagache,et al.  Power spectrum of the cosmic infrared background at 60 and 100 μm with IRAS , 2002, astro-ph/0207312.

[45]  A. Blain,et al.  The 60-μm extragalactic background radiation intensity, dust-enshrouded active galactic nuclei and the assembly of groups and clusters of galaxies , 2002, astro-ph/0202132.

[46]  Volker Bromm,et al.  The contribution of the first stars to the cosmic infrared background , 2001, astro-ph/0111467.

[47]  D. Lemke,et al.  Infrared to millimetre photometry of ultra-luminous ir galaxies: new evidence favouring a 3-stage dust model , 2001, astro-ph/0110213.

[48]  N. S. F. Center,et al.  THE COSMIC INFRARED BACKGROUND: Measurements and Implications ⁄ , 2001, astro-ph/0105539.

[49]  D. Elbaz,et al.  Interpreting the Cosmic Infrared Background: Constraints on the Evolution of the Dust-enshrouded Star Formation Rate , 2001, astro-ph/0103067.

[50]  T. Totani,et al.  Diffuse Extragalactic Background Light versus Deep Galaxy Counts in the Subaru Deep Field: Missing Light in the Universe? , 2001, astro-ph/0102328.

[51]  David J. Schlegel,et al.  Detection of a Far-Infrared Excess with DIRBE at 60 and 100 Microns , 2000, astro-ph/0004175.

[52]  A. Kashlinsky,et al.  Clustering of the Diffuse Infrared Light from the COBE DIRBE Maps. III. Power Spectrum Analysis and Excess Isotropic Component of Fluctuations , 1999, astro-ph/9908304.

[53]  C. Surace,et al.  The Universe as Seen by ISO , 1999 .

[54]  D. Schlegel,et al.  Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds , 1998 .

[55]  E.,et al.  THE COBE DIFFUSE INFRARED BACKGROUND EXPERIMENT SEARCH FOR THE COSMIC INFRARED BACKGROUND . I . LIMITS AND DETECTIONS , 1998 .

[56]  N. Odegard,et al.  The COBE Diffuse Infrared Background Experiment Search for the Cosmic Infrared Background. III. Separation of Galactic Emission from the Infrared Sky Brightness , 1998, astro-ph/9805323.

[57]  C. Bennett,et al.  The Spectrum of the Extragalactic Far-Infrared Background from the COBE FIRAS Observations , 1998, astro-ph/9803021.

[58]  William T. Reach,et al.  Infrared Excess and Molecular Clouds: A Comparison of New Surveys of Far-Infrared and H I 21 Centimeter Emission at High Galactic Latitudes , 1998, astro-ph/9802169.

[59]  E. Wright.  Angular Power Spectra of the COBE DIRBE Maps , 1997, astro-ph/9711261.

[60]  E. L. Wright,et al.  The COBE Diffuse Infrared Background Experiment Search for the Cosmic Infrared Background. II. Model of the Interplanetary Dust Cloud , 1997, astro-ph/9806250.

[61]  D. Schlegel,et al.  Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds , 1997, astro-ph/9710327.

[62]  A. Kashlinsky,et al.  Clustering of the Diffuse Infrared Light from the COBE DIRBE Maps. I. C(0) and Limits on the Near-Infrared Background , 1996, astro-ph/9604182.

[63]  L. Danese,et al.  The extragalactic infrared background , 1994, astro-ph/9410033.

[64]  W. Reach.  Zodiacal emission. I - Dust near the earth's orbit , 1988 .

[65]  J. R. Bond,et al.  Spectrum and Anisotropy of the Cosmic Infrared Background , 1986 .

[66]  A. Dressler.  A catalog of morphological types in 55 rich clusters of galaxies , 1980 .