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arXiv 1601.02514astro-ph.CO
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近红外背景起伏的最新分析

Updated analysis of near-infrared background fluctuations

Bin Yue, Andrea Ferrara, Ruben Salvaterra

摘要:

由{ \tt Spitzer}在3.6 $μ$ m处测量的近红外背景(NIRB)波动功率谱显示出超出已知星系信号的聚集,该信号已被解释为早期($z\simgt 13$)、吸积(直接坍缩)黑洞(DCBH)或低- $z$晕内光(IHL)。此外,这些波动与在(0.5-2)keV测量的宇宙X射线背景(CXB)相关,支持黑洞的解释。最近检测到两个{ \tt CIBER} 1.1/1.6 $μ$ m波段与3.6 $μ$ m { \tt Spitzer}波段之间的相关性,对这种情况提出了质疑。这种相关性很难用早期的DCBH来解释,由于星系间的吸收,DCBH不能对最短的波段做出贡献。在这里,我们表明,新的相关性是由银河系恒星光被尘埃散射而产生的漫射银河光(DGL)分量引起的。对过量的黑洞解释仍然完全有效,实际上,包含DGL允许对DCBH丰度/质量的要求较低(高达约30%)。

英文摘要:

The power spectrum of Near InfraRed Background (NIRB) fluctuations measured at 3.6 $μ$m by {\tt Spitzer} shows a clustering excess over the known galaxies signal that has been interpreted in terms of early ($z\simgt 13$), accreting (direct collapse) black holes (DCBH) or low-$z$ intrahalo light (IHL). In addition, these fluctuations correlate with the cosmic X-ray background (CXB) measured at (0.5-2) keV, supporting the black hole explanation. This scenario has been questioned by the recent detection of a correlation between the two {\tt CIBER} 1.1/1.6 $μ$m bands with the 3.6 $μ$m {\tt Spitzer} one. This correlation is hardly explained by early DCBHs that, due to intergalactic absorption, cannot contribute to the shortest wavelength bands. Here we show that the new correlation is caused instead by a Diffuse Galactic Light (DGL) component arising from Galactic stellar light scattered by dust. The black hole interpretation of the excess remains perfectly valid and, actually, the inclusion of DGL allows less demanding (by up to about 30\%) requirements on the DCBH abundance/mass.

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