Measurements of the HI intensity mapping power spectrum at low redshifts with MIGHTEE data: comparison with detected HI galaxies
University of the Western Cape（西开普敦大学）；South African Radio Astronomy Observatory (SARAO)（南非射电天文观测台）；The University of Edinburgh（爱丁堡大学）；The University of Manchester（曼彻斯特大学）
Junaid Townsend, Mario G. Santos, Suman Chatterjee, Zhaoting Chen, Sourabh Paul, Aishrila Mazumder, Laura Wolz, Matt J. Jarvis, Bradley S. Frank
备注：
20 pages, 25 figures, 3 tables. Submitted to MNRAS and comments are welcome
线性强度映射提供了一种统计方法来追踪宇宙中大尺度物质分布。我们应用HI强度映射技术来分析MeerKAT国际GHz级额外银河系探索（MIGHTEE）调查的干涉数据，分析COSMOS场中17.5小时的单指向数据，使用1332-1392 MHz频率范围内的60 MHz子带（0.02 ≤ z ≤ 0.07）。使用基于延迟光谱的估计器，我们测量了HI功率谱在亚兆帕斯卡尺度上的功率谱，并将其直接与同一区域中单独检测到的HI星系目录推断出的功率谱进行比较。在通过保守的异常值标记在三维功率谱中抵消低水平宽带污染后，时间分割可见度的交叉相关性在3 ≤ k ≤ 20 Mpc⁻¹的尺度上显示出统计显著的检测，总信号与噪声比约为13。在此范围内，通过可见度和检测到的星系获得的功率谱在不确定性范围内一致，并且幅度在10⁻²至10⁻¹ mK² Mpc³的量级。通过将检测到的星系通过功率谱估计器传播，通过直接强度场构造和模拟可见度，进行了端到端验证，证明在k ~ 20 Mpc⁻¹以内的一致性，超过此范围后测量变得受噪声主导。此外，还观察到数据与从检测到的HI星系中模拟的可见度之间的统计显著相关性，这应不受系统误差影响。这些结果为低红移的干涉HI强度映射提供了自洽的验证，并在相同的宇宙体积内展示了与星系测量的一致性。
英文摘要：
Line intensity mapping provides a statistical approach to tracing the large-scale distribution of matter in the Universe. We apply the HI intensity mapping technique to interferometric data from the MeerKAT International GHz-Tiered Extragalactic Explorations (MIGHTEE) Survey, analysing 17.5 hours of a single pointing in the COSMOS field, using a 60 MHz sub-band in the frequency range 1332 - 1392 MHz ($0.02 \lesssim z \lesssim 0.07$). Using a delay-spectrum-based estimator, we measure the HI power spectrum on sub-megaparsec scales and compare it directly to the power spectrum inferred from a catalogue of individually detected HI galaxies in the same field. After mitigating low-level broadband contamination through conservative outlier flagging in the three-dimensional power spectrum, cross-correlation of time-split visibilities yields a statistically significant detection on scales $3 \lesssim k \lesssim 20 \, \mathrm{Mpc}^{-1}$ with a total signal-to-noise ratio of $\sim 13$. Over this range, the power spectra obtained from visibilities and detected galaxies are consistent within uncertainties and have comparable amplitudes of order $10^{-2}$ - $10^{-1}$ $\mathrm{mK}^2 \mathrm{Mpc}^3$. End-to-end validation is performed by propagating detected galaxies through the power spectrum estimator via both direct intensity-field construction and simulated visibilities, demonstrating agreement up to $k \sim 20 \ \mathrm{Mpc}^{-1}$, beyond which measurements become noise-dominated. A statistically significant correlation is also observed between the data and the simulated visibilities from the detected HI galaxies, which should be free of systematics. These results provide a self-consistent validation of interferometric HI intensity mapping at low redshift and demonstrate agreement with galaxy-based measurements within the same cosmological volume.
MIGHTEE HI observations of low surface brightness and ultra-diffuse galaxies in the XMM-LSS field
ASTRON, Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）；Kapteyn Astronomical Institute, University of Groningen（格罗宁根大学卡普坦天文研究所）；Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire（赫特福德大学物理、天文与数学学院天体物理研究中心）；Astrophysics, Department of Physics, University of Oxford（牛津大学物理系天体物理学）；Leiden Observatory, Leiden University（莱顿大学莱顿天文台）；STFC UK Astronomy Technology Centre, Royal Observatory, Edinburgh（爱丁堡皇家望远镜标准设备中心）；Institute for Astronomy, University of Edinburgh（爱丁堡大学天体物理研究所）
MIGHTEE-HI: Environmental effects of cosmic filaments on extragalactic HI detections in the COSMOS and XMM-LSS fields
University of Oxford（牛津大学）；University of Cambridge（剑桥大学）；University of the Western Cape（西开普敦大学）；University of Bristol（布里斯托大学）；Universiteit Gent（根特大学）；University of Edinburgh（爱丁堡大学）；Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town（开普敦大学天文学系数据密集型天文跨大学研究所）；Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University（大学物理、天文与数学学院天体物理学研究中心）
A MIGHTEE robust measurement of the star formation rate-radio correlation
University of Oxford（牛津大学）；University of the Western Cape（西开普敦大学）；Max Planck Institute for Extraterrestrial Physics（马克斯·普朗克地外物理学研究所）；Excellence Cluster Universe（宇宙卓越集群）；University of Edinburgh（爱丁堡大学）
MIGHTEE/COSMOS-3D: The discovery of three spectroscopically confirmed radio-selected star-forming galaxies at z=4.9-5.6
University of Oxford（牛津大学）；University College London（伦敦大学学院）；University of the Western Cape（西开普大学）；University of Geneva（日内瓦大学）；University of Edinburgh（爱丁堡大学）
Ubiquitous Interstellar Neutral Helium Detected with JWST
NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）；LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS（巴黎萨克雷大学UVSQ、索邦大学、国家科学研究中心LATMOS/IPSL）；Department of Physics, University of Miami（迈阿密大学物理系）；Johns Hopkins University（约翰斯·霍普金斯大学）；Department of Astronomy, University of Maryland, College Park（马里兰大学天文学系）；Center for Research and Exploration
Forecasting the cross correlation of Terahertz Intensity Mapper [CII] line intensity maps with Euclid galaxies
California Institute of Technology（加州理工学院）；University of Pennsylvania（宾夕法尼亚大学）；Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）；Center for Astrophysics, Harvard & Smithsonian（哈佛与史密森尼天体物理中心）；Jet Propulsion Laboratory, Caltech Institute of Technology（加州理工学院喷气推进实验室）；University of Illinois Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）；Princeton University（普林斯顿大学）
ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: implications for spectral line intensity mapping at millimeter wavelengths and CMB spectral distortions
