The high-redshift star formation history from carbon-monoxide intensity maps
The high-redshift star formation history from carbon-monoxide intensity maps
复制标题
一氧化碳强度图的高红移恒星形成历史
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Kamionkowski
中科院分区：
文献类型：
--
作者：
P. Breysse;E. Kovetz;M. Kamionkowski
我们演示了如何通过一氧化碳强度图的一点统计来测量宇宙恒星形成历史。利用P(D)分析，可以从测量的一点强度PDF中推断出CO发射源的光度函数。从CO光度密度可以得到几个红移的恒星形成率密度(SFRD)。我们研究了仪器噪声、线前景和目标红移的影响，得到了对CO光度密度的10%量级的约束。结果表明，SFRD的不确定度主要由CO光度与恒星形成相关模型的不确定度所决定。对于这种模型不确定性的悲观估计，我们获得了针对红移在2到7之间的调查的SFRD的50%量级的误差，其中包括合理的噪声和前景。然而，强度图和星系之间的比较可以大大减少这种模型的不确定性。在这种情况下，我们在红移时对SFRD的限制提高到了大约5-10%，这与当前的测量结果具有很强的竞争力。
We demonstrate how cosmic star-formation history can be measured with one-point statistics of carbon-monoxide intensity maps. Using a P(D) analysis, the luminosity function of CO-emitting sources can be inferred from the measured one-point intensity PDF. The star-formation rate density (SFRD) can then be obtained, at several redshifts, from the CO luminosity density. We study the effects of instrumental noise, line foregrounds, and target redshift, and obtain constraints on the CO luminosity density of order 10%. We show that the SFRD uncertainty is dominated by that of the model connecting CO luminosity and star formation. For pessimistic estimates of this model uncertainty, we obtain an error of order 50% on SFRD for surveys targeting redshifts between 2 and 7 with reasonable noise and foregrounds included. However, comparisons between intensity maps and galaxies could substantially reduce this model uncertainty. In this case our constraints on SFRD at these redshifts improve to roughly 5-10%, which is highly competitive with current measurements.