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arXiv 0801.3825astro-ph
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近红外背景的NICMOS测量

NICMOS Measurements of the Near Infrared Background

Rodger I. Thompson, Daniel Eisenstein, Xiaohui Fan, Marcia Rieke, Robert Kennicutt

摘要:

本文讨论了近红外背景的本质。我们研究了在1.4微米处是否有多余的背景,近红外背景的来源是什么,以及减去所有已知来源后的背景是否包含高红移物体(Z > 10)的特征。根据NICMOS在哈勃超深场和北哈勃深场的观测,我们发现在1.4微米的背景中没有多余的,而所谓的多余是由于黄道背景的模型不准确。我们发现,现在的近红外背景空间分辨,并占主导地位的星系的红移范围在0.5和1.5之间。我们发现没有签名比可以归因于高红移源减去所有已知的来源,无论是在剩余背景或剩余背景的波动。我们表明,从NICMOS和斯皮策观测的波动的颜色是一致的,与低红移的对象和不一致的对象在红移大于10。这是最有可能的,在源扣除后的剩余波动功率是由于低红移星系的外部区域低于源的检测极限,因此在源扣除过程中没有被删除。

英文摘要:

This paper addresses the nature of the near infrared background. We investigate whether there is an excess background at 1.4 microns, what is the source of the near infrared background and whether that background after the subtraction of all known sources contains the signature of high redshift objects (Z > 10). Based on NICMOS observations in the Hubble Ultra Deep Field and the Northern Hubble Deep Field we find that there is no excess in the background at 1.4 microns and that the claimed excess is due to inaccurate models of the zodiacal background. We find that the near infrared background is now spatially resolved and is dominated by galaxies in the redshift range between 0.5 and 1.5. We find no signature than can be attributed to high redshift sources after subtraction of all known sources either in the residual background or in the fluctuations of the residual background. We show that the color of the fluctuations from both NICMOS and Spitzer observations are consistent with low redshift objects and inconsistent with objects at redshifts greater than 10. It is most likely that the residual fluctuation power after source subtraction is due to the outer regions of low redshift galaxies that are below the source detection limit and therefore not removed during the source subtraction.

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