2004ApJS..154...66M

Query : 2004ApJS..154...66M

2004ApJS..154...66M - Astrophys. J., Suppl. Ser., 154, 66-69 (2004/September-0)

Extragalactic source counts at 24 microns in the Spitzer First Look Survey.

MARLEAU F.R., FADDA D., STORRIE-LOMBARDI L.J., HELOU G., MAKOVOZ D., FRAYER D.T., YAN L., APPLETON P.N., ARMUS L., CHAPMAN S., CHOI P.I., FANG F., HEINRICHSEN I., IM M., LACY M., SHUPE D., SOIFER B.T., SQUIRES G., SURACE J., TEPLITZ H.I. and WILSON G.

Abstract (from CDS):

We present the Spitzer Multiband Imaging Photometer 24 µm source counts in the Extragalactic First Look Survey (FLS) main, verification, and European Large Area ISO Survey N1 fields. Spitzer's increased sensitivity and efficiency in large areal coverage over previous infrared telescopes, coupled with the enhanced sensitivity of the 24 µm band to sources at intermediate redshift, dramatically improve the quality and statistics of number counts in the mid-infrared. The FLS observations cover areas of 4.4, 0.26, and 0.015 deg2, respectively, and reach 3 σ 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 α=-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 µm 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 µm deep counts.

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Journal keyword(s): Galaxies: Statistics - Infrared: Galaxies

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ELAIS N1 reg 16 10 01 +54 30.6           ~ 489 0

Query : 2004ApJS..154...66M

Basic data :
ELAIS N1 -- Region defined in the Sky
Other object types: otypes_help 		reg (ELAIS)
ICRS coord. (ep=J2000) : 		16 10 01.0 +54 30 36 [ ] E 2000MNRAS.316..749O
FK4 coord. (ep=B1950 eq=1950) : 		16 08 50.4 +54 38 21 [ ]
Gal coord. (ep=J2000) : 		084.2827 +44.8975 [ ]
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Identifiers (1) :
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ELAIS N1

References (489 between 1850 and 2026) (Total 489)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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