Correlation-based Beam Calibration of 21cm Intensity Mapping

Autor:	Ding, Jiacheng, Wang, Xin, Pen, Ue-Li, Li, Xiao-Dong
Rok vydání:	2024
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics
Druh dokumentu:	Working Paper
Popis:	Foreground removal presents a significant obstacle in both current and forthcoming intensity mapping surveys. While numerous techniques have been developed that show promise in simulated datasets, their efficacy often diminishes when applied to real-world data. A primary issue is the frequency-dependent variations in the instrumental response. In this paper, we propose a novel approach utilizing the internal cross-correlation among different frequencies to calibrate the beam's frequency fluctuations. Using a simulated dataset that incorporates frequency-dependent random fluctuations into the beam model, we illustrate that our method can achieve considerable improvements over traditional techniques. Our results represent a step forward in enhancing the precision and reliability of foreground removal in intensity mapping surveys. Comment: Accepted for publication in ApJS
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2408.06682 Zobrazit plný text záznamu View this record from Arxiv