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题名:
Erasing the Milky Way: new cleaning technique applied to GBT intensity mapping data
作者: Wolz, L.1,2; Blake, C.3; Abdalla, F. B.4; Anderson, C. J.5; Chang, T. -C.6; Li, Y. -C.7; Masui, K. W.8,9; Switzer, E.10; Pen, U. -L.11; Voytek, T. C.12; Yadav, J.13
关键词: methods: data analysis ; methods: statistical ; cosmology: observations ; large-scale structure of Universe ; radio lines: galaxies
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
发表日期: 2017-02-01
DOI: 10.1093/mnras/stw2556
卷: 464, 期:4, 页:4938-4949
文章类型: Article
收录类别: SCI
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: DIGITAL SKY SURVEY ; INDEPENDENT COMPONENT ANALYSIS ; DARK ENERGY SURVEY ; ACOUSTIC-OSCILLATIONS ; POWER SPECTRUM ; 21-CM EMISSION ; DATA RELEASE ; TO 0.8 ; GALAXY ; MAPS
英文摘要: We present the first application of a new foreground removal pipeline to the current leading HI intensity mapping data set, obtained by the Green Bank Telescope (GBT). We study the 15- and 1-h-field data of the GBT observations previously presented in Mausui et al. and Switzer et al., covering about 41 deg(2) at 0.6 < z < 1.0, for which cross-correlations may be measured with the galaxy distribution of the WiggleZ Dark Energy Survey. In the presented pipeline, we subtract the Galactic foreground continuum and the point-source contamination using an independent component analysis technique (FASTICA), and develop a Fourier-based optimal estimator to compute the temperature power spectrum of the intensity maps and cross-correlation with the galaxy survey data. We show that FASTICA is a reliable tool to subtract diffuse and point-source emission through the non-Gaussian nature of their probability distributions. The temperature power spectra of the intensity maps are dominated by instrumental noise on small scales which FASTICA, as a conservative subtraction technique of non-Gaussian signals, cannot mitigate. However, we determine similar GBT-WiggleZ cross-correlation measurements to those obtained by the singular value decomposition (SVD) method, and confirm that foreground subtraction with FASTICA is robust against 21 cm signal loss, as seen by the converged amplitude of these cross-correlation measurements. We conclude that SVD and FASTICA are complementary methods to investigate the foregrounds and noise systematics present in intensity mapping data sets.
语种: 英语
项目资助者: Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)(CE110001020) ; Australian Research Council
WOS记录号: WOS:000393780500083
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bao.ac.cn/handle/114a11/8887
Appears in Collections:星系宇宙学研究部_期刊论文

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作者单位: 1.Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia
2.Univ Sydney, Sch Phys, ARC Ctr Excellence All Sky Astrophys CAASTRO, Bldg A28, Sydney, NSW 2006, Australia
3.Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia
4.UCL, Dept Phys & Astron, London WC1E 6BT, England
5.Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA
6.Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan
7.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China
8.Univ British Columbia, Dept Phys & Astron, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada
9.Canadian Inst Adv Res, CIFAR Program Cosmol & Grav, Toronto, ON M5G 1Z8, Canada
10.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
11.Canadian Inst Theoret Astrophys, 60 St George St, Toronto, ON M5S 3H8, Canada
12.Univ KwaZulu Natal, Sch Chem & Phys, Astrophys & Cosmol Res Unit, ZA-4041 Durban, South Africa
13.Univ Delhi, Sri Aurobindo Coll, New Delhi 110017, India

Recommended Citation:
Wolz, L.,Blake, C.,Abdalla, F. B.,et al. Erasing the Milky Way: new cleaning technique applied to GBT intensity mapping data[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,464(4):4938-4949.
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