论文标题
关于星系的全球恒星形成定律的宇宙学限制：来自Baryon声学振荡强度映射的见解
Cosmological Constraints on the Global Star Formation Law of Galaxies: Insights From Baryon Acoustic Oscillation Intensity Mapping
论文作者
论文摘要
线强度映射（LIM）最初是作为大规模结构的宇宙学探针，还为银河发展的天体物理学提供了独特的窗口。除了传统上专注于非线性尺度上的LIM技术的天体物理探索，我们提出了一种新的方法，可以使用大规模的Baryonic声学振荡（BAO）强度映射的即将出现的数据研究全球恒星形成法。使用BARYON分数波动引起的百分比但比例依赖性偏差的幅度，我们表明，将自动和互相关的功率谱相结合，具有两个（或更多）lim信号的自动相关功率谱，可以探测星形形成型法律范围power Index $ \ Mathcal $ \ \ Mathcal {n} $。我们研究了所有尺度上绘制H $α$和[OIII]线的前景，尤其是在存在Baryon分数偏差的烙印的情况下，以及Sphex等空间任务。我们表明，尽管Spherex可以通过在200 deg $^2 $深度调查中访问适量的大规模模式，但spherex可能只能在少量探测$ \数学{n} $中，但未来的全面调查达到了可比的深度，并具有改进的光谱分辨率（$ r \ gtrsim 400 $）$ $ \ $ \ $ \ n MATHIS $ \ 30％}足以区分不同反馈假设的模型，使用BAO强度映射到$ z \ sim4 $。利用这种效果，在远的未来中，大型宇宙变化有限的LIM调查可以仔细检查星系演化与大规模宇宙学环境之间的物理联系，同时对标准宇宙学模型进行严格的测试。
Originally proposed as a cosmological probe of the large-scale structure, line intensity mapping (LIM) also offers a unique window into the astrophysics of galaxy evolution. Adding to the astrophysical explorations of LIM technique that have traditionally focused on small, non-linear scales, we present a novel method to study the global star formation law using forthcoming data from large-scale baryonic acoustic oscillation (BAO) intensity mapping. Using the amplitude of the percent-level but scale-dependent bias induced by baryon fraction fluctuations on BAO scales, we show that combining auto- and cross-correlation power spectra of two (or more) LIM signals allows to probe the star formation law power index $\mathcal{N}$. We examine the prospect for mapping H$α$ and [OIII] lines across all scales, especially where imprints of the baryon fraction deviation exist, with space missions like SPHEREx. We show that although SPHEREx may only marginally probe $\mathcal{N}$ by accessing a modest number of large-scale modes in its 200 deg$^2$ deep survey, future infrared all-sky surveys reaching a comparable depth with an improved spectral resolution ($R \gtrsim 400$) are likely to constrain $\mathcal{N}$ to a precision of 10$-$30%, sufficient for distinguishing models with varying feedback assumptions, out to $z\sim4$ using BAO intensity mapping. Leveraging this effect, large, cosmic-variance-limited LIM surveys in the far future can scrutinize the physical connection between galaxy evolution and the large-scale cosmological environment, while performing stringent tests of the standard cosmological model.
