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Date and Time of the Query: 2018-12-15 T01:19:27 PST
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For refcode 2004A&A...413..843K:
Retrieve 263 NED objects in this reference.
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NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2004A&A...413..843K ISO deep far-infrared survey in the "Lockman Hole" III. Catalogs and source counts at 90 & 170 microns K. Kawara, H. Matsuhara, H. Okuda, Y. Taniguchi, Y. Sato, Y. Sofue, K. Wakamatsu, S. Oyabu, D. B. Sanders and L. L. Cowie Received 28 May 2003 / Accepted 25 September 2003 We present the catalogs and source counts for the C_90_ (reference wavelength of 90) and C_160_ (170) bands, which were extracted from our analysis of an ISO deep far-infrared survey conducted as part of the Japan/UH ISO cosmology project. The total survey area is ~ 0.9 deg in two fields within the Lockman Hole. The analysis consists of source extraction using the IRAF DAOPHOT package and simulations carried out by adding artificial sources to the maps to estimate the detection rate, the flux bias, the positional accuracy, and the noise. The flux calibration was performed using the Sb galaxy UGC06009 - the photometric error was estimated to be ~50% at C_90_ and 65% at C_160._ The total noise estimated from the simulation is dominated by the confusion noise due to the high source density. The confusion noise is ~20 mJy at C_90_ and 35 mJy at C_160_, which is much larger than the instrumental noise which is at the level of a few mJy or less. The catalogs were constructed by selecting 223 C_90_ sources and 72 C_160_ sources with a Signal to Noise Ratio (SNR) of three or greater. The distribution of the observed associations between C_90_ and C_160_ sources indicates that the 1 {sigma} positional errors are ~20" and 35" at C_90_ and C_160_, respectively. The corrections for the detection rate and the flux bias are significant for sources fainter than 200 mJy at C_90_ and 250 mJy at C_160._ Most of the sources detected both at C_90_ and C_160_ have a F(C_160_)/ F(C_90_) color redder than the Sb galaxy UGC 06009. Such a red color could result from reddening due to the flux bias or a K-correction brightening due to the effect of redshift. Red sources brighter than 200 mJy at C_160_ may be very luminous galaxies like Arp 220 at moderate redshift. The source counts are derived by applying the corrections for the detection rate and flux bias. The resultant counts are quite consistent with the constraints derived from the fluctuation analysis performed in Paper II. The C_160_ counts are also consistent with the results from the FIRBACK project. Our C_90_ survey, which is 2-3 times deeper than those previously published, reveals an upturn in the count slope at around 200 mJy. While recent models give a reasonable fit to the C_160_ counts, none of them are successful in accounting for the upturn in the C_90_ counts. If the upturn is caused by ultraluminous IR galaxies, their redshifts would need to be at z ~ 0.5, implying a major event in galaxy evolution at moderate redshift. Keywords: galaxies: evolution, galaxies: starburst, cosmology: observations, infrared: galaxies
Retrieve 263 NED objects in this reference.
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