论文标题
使用Meerkat的HI强度映射：与Wigglez星系互相关的功率谱检测
HI intensity mapping with MeerKAT: power spectrum detection in cross-correlation with WiggleZ galaxies
论文作者
论文摘要
我们提出了对Wigglez Dark Energy调查中Meerkat无线电强度图和星系之间相关聚类的检测。我们发现$7.7σ$检测互相关功率谱，其幅度与HI密度分数（$ω_ {\ rm hi} $），HI BIAS（$ B _ {\ rm HI} $）和交叉折叠系数（$ r $）成正比。因此，我们获得约束$ω_ {\ rm hi} b _ {\ rm hi} r \，{=} \，[0.86 \，{\ pm} \，0.10 \，（{\ rm Stat}） sys}）] \，{\ times} \，10^{ - 3} $，有效比例为$ k _ {\ rm eff} \，{\ sim} \，0.13 \，h \，h \，{\ rm mpc}^{ - 1} $。强度图是从Meerkat望远镜的试点调查中获得的，Meerkat望远镜是SKA天文台（SKAO）的64次探路阵列。数据是从10个小时的观察结果中收集的，使用Meerkat的L频段接收器，覆盖了Wigglez的11小时内，频率为$ 1015-973 \，{\ rm MHz} $（0.400 $ \，，{<} <} \，{<} \，z \，{<} <} \ 0.459，该检测是宇宙学多态自动相关强度映射技术的第一个实用证明。这标志着宇宙学科学案例的路线图中的一个重要里程碑。
We present a detection of correlated clustering between MeerKAT radio intensity maps and galaxies from the WiggleZ Dark Energy Survey. We find a $7.7σ$ detection of the cross-correlation power spectrum, the amplitude of which is proportional to the product of the HI density fraction ($Ω_{\rm HI}$), HI bias ($b_{\rm HI}$) and the cross-correlation coefficient ($r$). We therefore obtain the constraint $Ω_{\rm HI} b_{\rm HI} r\,{=}\,[0.86\,{\pm}\,0.10\,({\rm stat})\,{\pm}\,0.12\,({\rm sys})]\,{\times}\,10^{-3}$, at an effective scale of $k_{\rm eff}\,{\sim}\,0.13\,h\,{\rm Mpc}^{-1}$. The intensity maps were obtained from a pilot survey with the MeerKAT telescope, a 64-dish pathfinder array to the SKA Observatory (SKAO). The data were collected from 10.5 hours of observations using MeerKAT's L-band receivers over six nights covering the 11hr field of WiggleZ, in the frequency range $1015-973\,{\rm MHz}$ (0.400$\,{<}\,z\,{<}\,$0.459 in redshift). This detection is the first practical demonstration of the multi-dish auto-correlation intensity mapping technique for cosmology. This marks an important milestone in the roadmap for the cosmology science case with the full SKAO.
