宇宙红外背景涨落中的第一恒星时代印记
Imprint of first stars era in the cosmic infrared backround fluctuations
摘要：
我们提出了最新的结果CIB波动从早期时代从深斯皮策数据。结果表明，在IRAC波长（3.6至8 mic）存在显着的CIB波动，这些波动在将星系移到非常微弱的水平后仍然存在。这些波动必须从具有显著聚类成分的种群中产生，但只有低水平的散粒噪声。在光源减去的IRAC图和用HST ACS在光学波长处观察到的相应场之间没有相关性。综合起来，这些数据表明：1）产生CIB涨落的源在3.6和4.5mic处都是微弱的，S_v <几nJy; 3）位于前0.7 Gyr内（除非这些波动可以以某种方式产生-迄今尚未观测到-极低光度的本地星系和不寻常的本地人口集群模式），4）在3.6 mic和4.5 mic时，它们对净CIB通量的贡献至少为1-2 nW/m^2/sr，并且质光比必须显著低于现今的星群; 5）它们的角密度约为几个/弧秒^[2]，目前的仪器无法分辨，但可以用JWST单独观测到。
英文摘要：
We present the latest results on CIB fluctuations from early epochs from deep Spitzer data. The results show the existence of significant CIB fluctuations at the IRAC wavelengths (3.6 to 8 mic) which remain after removing galaxies down to very faint levels. These fluctuations must arise from populations with a significant clustering component, but only low levels of the shot noise. There are no correlations between the source-subtracted IRAC maps and the corresponding fields observed with the HST ACS at optical wavelengths. Taken together, these data imply that 1) the sources producing the CIB fluctuations are individually faint with S_ν< a few nJy at 3.6 and 4.5 mic; 2) have different clustering pattern than the more recent galaxy populations; 3) are located within the first 0.7 Gyr (unless these fluctuations can somehow be produced by - so far unobserved - local galaxies of extremely low luminosity and with the unusual for local populations clustering pattern), 4) produce contribution to the net CIB flux of at least 1-2 nW/m^2/sr at 3.6 and 4.5 mic and must have mass-to-light ratio significantly below the present-day populations, and 5) they have angular density of ~ a few per arcsec^2 and are in the confusion of the present day instruments, but can be individually observable with JWST.
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