Extragalactic Source Counts at 24 Microns in the Spitzer First Look Survey

Abstract

We present the Spitzer MIPS 24 micron source counts in the Extragalactic First Look Survey main, verification and ELAIS-N1 fields. Spitzer's increased sensitivity and efficiency in large areal coverage over previous infrared telescopes, coupled with the enhanced sensitivity of the 24 micron band to sources at intermediate redshift, dramatically improve the quality and statistics of number counts in the mid-infrared. The First Look Survey observations cover areas of, respectively, 4.4, 0.26 and 0.015 sq.deg. and reach 3-sigma depths of 0.11, 0.08 and 0.03 mJy. The extragalactic counts derived for each survey agree remarkably well. The counts can be fitted by a super-Euclidean power law of index alpha=-2.9 from 0.2 to 0.9 mJy, with a flattening of the counts at fluxes fainter than 0.2 mJy. Comparison with infrared galaxy evolution models reveals a peak's displacement in the 24 micron counts. This is probably due to the detection of a new population of galaxies with redshift between 1 and 2, previously unseen in the 15 micron deep counts.

Accepted for publication in special Spitzer ApJS issue, 4 pages

References in corpus (19)

• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The Spitzer Space Telescope Mission
• The CANADA-FRANCE REDSHIFT SURVEY XIII: The luminosity density and star-formation history of the Universe to z ~ 1
• The IRAS Revised Bright Galaxy Sample (RBGS)
• Interpreting the Cosmic Infrared Background: Constraints on the Evolution of the Dust Enshrouded Star Formation Rate
• Reddening and Star Formation in Starburst Galaxies
• Analysis of isoplanatic high resolution stellar fields by Starfinder code
• The Bulk of the Cosmic Infrared Background Resolved by ISOCAM
• Modelling the infrared galaxy evolution using a phenomenological approach
• The European Large Area ISO Survey I: Goals, Definition and Observation
• A Long-Wavelength View on Galaxy Evolution from Deep Surveys by the Infrared Space Observatory
• An ISOCAM survey through gravitationally lensing galaxy clusters
• The bi-variate luminosity-color distribution of IRAS galaxies, and implications for the high redshift Universe
• New Method for ISOCAM Data Reduction - II. Mid-Infrared Extragalactic Source Counts in the Southern ELAIS Field
• The Spitzer Space Telescope First-Look Survey: KPNO MOSAIC-1 R-band Images and Source Catalogs
• Deep H-band Galaxy Counts and Half-light Radii from HST/NICMOS Parallel Observations
• Models for Evolution of Dusty Galaxies and E/S0s Seen in Multiband Surveys
• A General Formulation of the Source Confusion Statistics and Application to Infrared Galaxy Surveys
• The red stellar population in NGC 1569

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