2010A&A...514A...8P


Query : 2010A&A...514A...8P

2010A&A...514A...8P - Astronomy and Astrophysics, volume 514, A8-8 (2010/5-1)

Source counts at 15 microns from the AKARI NEP survey.

PEARSON C.P., OYABU S., WADA T., MATSUHARA H., LEE H.M., KIM S.J., TAKAGI T., GOTO T., IM M.S., SERJEANT S., LEE M.G., KO J.W., WHITE G.J. and OHYAMA O.

Abstract (from CDS):

We present galaxy counts at 15-microns using the Japanese AKARI satelitte's NEP-deep and NEP-wide legacy surveys at the north ecliptic pole. The total number of sources detected are approximately 6700 and 10700 down to limiting fluxes of 117 and 250-microJy (5sigma) for the NEP-deep and NEP-wide survey respectively. We construct the Euclidean normalized differential source counts for both data sets (assuming 80 percent completeness levels of 200 and 270-microJy respectively) to produce the widest and deepest contiguous survey at 15-microns to date covering the entire flux range from the deepest to shallowest surveys made with the infrared space observatory (ISO) over areas sufficiently significant to overcome cosmic variance, detecting six times as many sources as the largest survey carried out with ISO. We compare the results from AKARI with the previous surveys with ISO at the same wavelength and the Spitzer observations at 16-microns using the peek-up camera on its IRS instrument. The AKARI source counts are consistent with other results to date reproducing the steep evolutionary rise at fluxes less than a milliJansky and super-Euclidean slopes. We find the the AKARI source counts show a slight excess at fluxes fainter than 200-microJanskys which is not predicted by previous source count models at 15-microns. However, we caution that at this level we may be suffering from the effects of source confusion in our data. At brighter fluxes greater than a milliJansky, the NEP-wide survey source counts agree with the Northern ISO-ELAIS field results, resolving the discrepancy of the bright end calibration in the ISO 15-micron source counts.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - infrared: galaxies - surveys

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 ELAIS S1 reg 00 34 44 -43 28.2           ~ 207 0
2 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 749 0
3 NAME Marano1 Field reg 03 15.2 -55 14           ~ 21 0
4 ELAIS S2 reg 05 02 24 -30 35.9           ~ 18 0
5 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5869 6
6 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 841 0
7 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1925 1
8 ELAIS N3 reg 14 29 06 +33 06.0           ~ 14 0
9 ELAIS N1 reg 16 10 01 +54 30.6           ~ 422 0
10 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 809 1
11 ELAIS N2 reg 16 36 48.0 +41 01 45           ~ 167 0
12 NAME NEP reg 18 00 00.000 +66 33 38.55           ~ 362 0
13 ACO 2390 ClG 21 53 37.4 +17 41 46           ~ 689 2
14 NAME HDF-S reg 22 32 56 -60 33.0           ~ 570 0

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